Updated on 2024/07/16

写真a

 
HARUNA,Takumi
 
Organization
Faculty of Chemistry, Materials and Bioengineering Professor
Title
Professor
Contact information
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Degree

  • Ph.D. ( 1992.3 )

Research Areas

  • Manufacturing Technology (Mechanical Engineering, Electrical and Electronic Engineering, Chemical Engineering) / Manufacturing and production engineering

  • Nanotechnology/Materials / Structural materials and functional materials

  • Nanotechnology/Materials / Material processing and microstructure control

Education

  • Osaka University   Graduate School, Division of Engineering   Department of Metallurgy

    - 1992

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  • Osaka University   Graduate School of Engineering   Department of Materials Science and Engineering

    1989

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    Country: Japan

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  • Osaka University   Faculty of Engineering   Department of Metallurgy

    - 1987

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    Country: Japan

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Research History

  • Associate Professor, Kansai University (Department of Chemistry and Materials Engineering, Faculty of Chemistry, Materials and Bioengineering)

    2007.4 - 2012.3

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  • Associate Professor, Kansai University (Department of Materials Science and Engineering, Faculty of Engineering)

    2006.4 - 2007.3

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  • Lecturer, Kansai University (Department of Materials Science and Engineering, Faculty of Engineering)

    2005.4 - 2006.3

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  • Assitant Professor, Osaka University (Department of Materials Science and Processing, Graduate School of Engineering)

    2004.4 - 2005.3

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  • Research Associate, Osaka University (Department of Materials Science and Processing, Graduate School of Engineering)

    1998.4 - 2004.3

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  • Postdoctral fellow, The Pennsylvania State University (Center for Advanced Material)

    1994.12 - 1996.6

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  • Research Associate, Osaka University (Department of Materials Science and Processing, Faculty of Engineering)

    1992.4 - 1998.3

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Professional Memberships

  • Iron and Steel Institute of Japan

    2022.4 - 2024.4

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  • Japan Society of Corrosion Engineering

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  • The Electrochemical Society

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  • Japan Institute of Metals

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  • Japan Institute of Light Metals

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  • Japan Society of Materials Science

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  • Nathonal Axxosiation of Corrosion Engineer

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  • International Society of Electrochemistry

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Committee Memberships

  •   代議員  

    2022.4 - 2024.4   

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  •   ICAA18実行委員会  

    2021 - 2022   

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  •   編集委員会委員  

    2019.6 - 2021.5   

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  •   講演大会プログラム編成委員会委員  

    2018 - 2019   

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  •   研究委員会  

    2016   

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  •   理事  

    2015 - 2017   

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  •   関西支部副支部長  

    2013 - 2014   

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  •   和文誌・欧文誌編集委員会委員  

    2012 - 2014   

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  •   総務委員会委員  

    2012 - 2014   

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  •   編集委員会編集幹事;関西支部理事;研究委員会  

    2012 - 2014   

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  •   編集委員会委員  

    2010   

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  •   広報委員会委員  

    2009 - 2011   

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  •   まてりあ編集委員会委員  

    2009 - 2011   

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  •   理事  

    2009 - 2011   

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  •   評議員  

    2008 - 2010   

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  •   評議員  

    2008 - 2009   

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  •   2009年度腐食防食討論会実行委員  

    2008 - 2009   

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  •   関西支部幹事  

    2006 - 2012   

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  •   関西支部学術小委員会主査  

    2006   

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  •   関西支部評議員  

    2006   

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  •   平成16年度論文賞選考委員会委員  

    2003   

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  •   コロージョン・セミナー実行委員会委員  

    2000 - 2005   

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  •   会誌編集委員会委員  

    1999 - 2000   

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  •   平成10年度進歩賞選考委員会委員  

    1998   

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  •   第43回腐食防食討論会実行委員  

    1996   

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  •   腐食防食部門委員会委員  

       

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Papers

  • 隙間噴流試験中の銅合金の電気化学反応

    安田 吉伸, 水谷 直弘, 松林 良蔵, 丸山 徹, 春名 匠

    鋳造工学 全国講演大会講演概要集   180   31 - 31   2022

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    Language:Japanese   Publisher:公益社団法人 日本鋳造工学会  

    DOI: 10.11279/jfeskouen.180_31

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  • 一定湿度の大気と乾燥大気に繰り返し接触させた各種鋼材の大気腐食に伴う質量増加速度 Reviewed

    春名 匠, 中井美紗季, 廣畑洋平

    鉄と鋼   Vol.107, No.12, pp.1036-1046   2021.12

  • 異なるMgCl2 含有量のさび層を形成させたFeに湿度を制御した大気中で発生する腐食に伴う水素侵入 Reviewed

    春名 匠, 汪 洋, 山西 潤

    鉄と鋼   Vol.107, No.11, pp.915-922   2021.11

  • MgCl2を含むさび層を形成させたFeの大気腐食に伴う水素侵入に及ぼす大気湿度の影響 Reviewed

    汪 洋, 山西 潤, 春名 匠

    鉄と鋼   Vol.107, No.11, pp.906-914   2021.11

  • 隙間噴流試験における鉛フリー銅合金の耐エロージョン・コロージョン性に及ぼす試験溶液の流量の影響 Reviewed

    安田吉伸, 水谷直弘, 松林良蔵, 丸山 徹, 春名 匠

    鋳造工学   Vol.93, No.6, pp.323-330   2021.6

  • Preface to the Special Issue on “Toward Suppression of Hydrogen Absorption and Hydrogen Embrittlement for Steels” Reviewed

    T. Haruna

    ISIJ Internatinoal   Vol.61, Iss.4, p.1055   2021.4

  • Effect of humidity of air on hydrogen absorption into Fe with rust layer containing MgCl2 during atmospheric corrosion Reviewed

    Y. Wang, J. Yamanishi, T. Haruna

    ISIJ Internatinoal   Vol.61, Iss.4, pp.1143-1150   2021.4

  • Hydrogen absorption into Fe plates with rust layers containing various MgCl2 amounts during atmospheric corrosion with controlled humidity Reviewed

    T. Haruna, Y. Wang, J. Yamanishi

    ISIJ Internatinoal   Vol.61, Iss.4, pp.1179-1185   2021.4

  • Hydrogen absorption rate into Fe with rust layer containing NaCl during atmospheric corrosion in humidity-controlled air Reviewed

    T. Haruna, Y. Shoji, Y. Hirohata

    ISIJ Internatinoal   Vol.61, Iss.4, pp.1079-1084   2021.4

  • Polarization Curves of Carbon Steel in Concentrated LiBr Solutions Containing LiOH and Li2MoO4 at Different Temperatures after Short Iimmersion Reviewed

    T. Irie, D. Morihashi, Y. Hirohata, T. Haruna

    Mater. Trans.   Vol.62, No.3,pp.420-426   2021.3

  • Correlation between susceptibility to environment-assisted cracking of super-elastic TiNi alloy and the states and their amount of hydrogen in it Reviewed

    T. Haruna, D. Morihashi, Y. Hirohata

    MATEC Web of Conferences   Vol.321, Paper No.06002   2020.12

  • 濃厚LiBr水溶液中における銅の腐食形態と腐食減少量の経時変化 Reviewed

    入江智芳, 上原伶祐, 北村亮裕, 八鍬 浩, 春名 匠

    材料   Vol.69, No.11, pp.810-816   2020.11

  • Stress corrosion cracking of SUS316l stainless steel in the chloride solution containing thiosulfate ion by the slow strain rate technique

    Toshio Shibata, Takumi Haruna, Shinji Fujimoto, Shinsuke Nakane

    Tetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan   77 ( 9 )   1511 - 1518   2020.9

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    Publishing type:Research paper (scientific journal)  

    Stress corrosion cracking (SCC) behavior of SUS316L stainless steel in the chloride solution containing thiosulfate has been investigated by using a slow strain rate technique (SSRT). The susceptibility of SCC was found to depend on the strain rate, the concentration of thiosulfate and chloride, and pH. The highest susceptibility was obtained at the condition of 20 mass % NaCl containing 10-2 kmol·m-3 Na2S2O3 at pH 5.3 and 2.2 × 10-7 s-1. Observations of fractured specimens showed that cracks perpendicular to the tensile axis generated at the pits. The initial fracture mode of the crack was intergranular, followed by transgranular and dimple with propagation of the crack. Intergranular fracture initiated from intergranular corrosion on the bottom of the pit, in which pH decreased less than 2. Immediately after immersion, pits generated easily because the dissolved oxygen with thiosulfate rapidly raise free corrosion potential upto pitting potential in cooperation with the action of thiosulfate to lower the pitting potential. Decrease in pH caused lowering of pitting potential and increase of the number of cracks, while the highest SCC susceptibility was obtained at pH 5.3. At conditions showing the high SCC susceptibility, corrosion potential was always in the range between -400 and -370 mV (Ag/AgCl). Therefore, the SCC behavior in this system is strongly controlled by the electrochemical factors.

    DOI: 10.2355/tetsutohagane1955.77.9_1511

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  • 塩化物水溶液中における銅合金の腐食に及ぼすCu2+およびCl−の影響 Reviewed

    安田吉伸, 松林良蔵, 丸山 徹, 春名 匠

    銅と銅合金   Vol.59, No.1, pp.161-166   2020.8

  • 濃厚臭化リチウム水溶液中における銅の腐食挙動に対する環境因子の影響 Reviewed

    入江智芳, 八鍬 浩, 尾田拓哉, 廣畑洋平, 春名 匠

    銅と銅合金   Vol.59, No.1, pp.156-160   2020.8

  • 鋼材表面に生成した腐食生成物の機械学習による放射光XAFS解析 Reviewed

    小澤敬祐, 山本慎太郎, 森 拓弥, 横溝臣智, 李 雷, 横山和司, 春名 匠

    材料と環境   Vol.69, No.1, pp.1-4   2020.1

  • Corrosion Behavior of Pb-Free Copper Alloys Immersed in Chloride Aqueous Solution

    YASUDA, Yoshinobu, ABE, Hiroyuki, MATSUBAYASHI, Ryozo, MARUYAMA,Toru, HARUNA, Takumi

    J. Japan Inst. Metar.   83巻 11号 pp.416-423 ( 11 )   2019.11

  • PbフリーCu合金とその晶出物であるCu2SおよびBiの腐食挙動 Reviewed

    安田吉伸, 阿部弘幸, 松林良蔵, 丸山 徹, 春名 匠

    日本金属学会誌   Vol.83, No.1, pp.15-22   2019.1

  • Diffusion Behavior of D2O in an Fe3O4 Film on Fe Formed in an NaOH Solution Containing Oxidants

    T. Haruna

    Corros. Eng.   Vol.67, No.9, pp.349-355   2018.12

  • 隙間噴流試験による硫化物分散型鉛フリー銅合金の耐エロージョン・コロージョン性評価 Reviewed

    安田吉伸, 水谷直弘, 阿部弘幸, 松林良蔵, 丸山 徹, 春名 匠

    銅と銅学会   Vol.62, No.3, pp.79-88   2018.3

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  • Corrosion Behavior of Lead-Free Copper Alloy Castings and Their Crystallized Substances of Cu2S and Bi Reviewed

    Y. Yasuda, H. Abe, R. Matsubayashi, T. Maruyama, T. Haruna

    Materials Transactions   Vol.58, No.12, pp.1679-1686 ( 12 )   1679 - 1686   2017.11

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Japan Institute of Metals (JIM)  

    In this study, we aimed to understand the corrosion behavior of Pb-free Cu alloys (Japan Industrial Standards (JIS) CAC411 and CAC901) and their crystallized substances (Cu2S and Bi, respectively) particles in a 3.0 mass% NaCl aqueous solution, in comparison with those of a Cu alloy (JIS CAC406), its crystallized substance (Pb) particles. and a Cu alloy (JIS CAC403) with no crystallized substances. A Cu2S specimen was produced via sintering Cu2S powders, and a Bi specimen was produced by Bi electro-plating on a Cu substrate. The measured corrosion potentials of CAC411, CAC901, and CAC403 were close to that of Sn instead Cu. The current density peak near the corrosion potential of CAC403, which was the highest Sn concentration, was the largest in comparison with those of the other Cu alloys. Conversely, rapid increase in the current density, which was shown for all the Cu alloy at the potential above -0.20 V vs. Ag/AgCl, was similar to that of Cu. Therefore, it was concluded that these increase in current densities of Cu alloys was due to the dissolution of the Cu matrix. Cu2S was converted into CuS during the anodic reaction. However, the corrosion potential of Cu2S was higher than those of Cu and CAC411. Therefore, it was concluded that the Cu2S particles in CAC411 act as cathodic sites and remain stable during the natural corrosion. The corrosion potential of Bi was higher than that of CAC901 and slightly lower than that of Cu. Further, at the potentials below -0.10 V vs. Ag/AgCl, Bi was thought to be covered with the passive film of Bi2O3 that was expected to protect Bi from corrosion. Therefore, it was concluded that the Bi particles in CAC901 hardly suffer severe corrosion. The corrosion potential of Pb was lower than those of the Cu and Cu alloys expect for CAC406. In addition, Pb exhibited a large anodic current density and dissolved actively around the corrosion potential of Cu. Therefore, it was concluded that the Pb particles dissolved preferentially during the corrosion of CAC406 owing to the galvanic corrosion. It was finally concluded that the Cu2S and the Bi particles in CAC411 and CAC901, respectively, hardly suffer severe corrosion than the Pb particles in CAC406 in chloride-containing aqueous solutions like sea water.

    DOI: 10.2320/matertrans.M2017196

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  • 大気腐食中における金属表面のpH分布測定装置の開発

    廣畑洋平, 西田健太朗, 春名 匠, 野田和彦

    日本金属学会誌   Vol.81, No.11, pp.495-501   2017.11

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  • 硫化物分散型鉛フリー銅合金中のCu2Sのカソード分解反応 Reviewed

    安田吉伸, 阿部弘幸, 松林良蔵, 丸山 徹, 春名 匠

    銅と銅合金   Vol.56, No.1, pp.184-189   2017.8

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  • 硫化物分散型鉛フリー銅合金中の硫化物が及ぼすめっきへの影響 Reviewed

    安田吉伸, 阿部弘幸, 吉居久光, 小寺善人, 松林良蔵, 丸山 徹, 春名 匠

    表面技術   Vol.68, No.4, pp.201-207   2017.4

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  • 大気中におけるステンレス鋼の孔食発生に及ぼすMgCl2液膜の濃度および厚さの影響

    廣畑洋平, 太田博貴, 春名 匠, 野田和彦

    日本金属学会誌   Vol.81, No.3, pp.115-119   2017.3

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  • Effect of annealing temperature on susceptibility to hydrogen embrittlement of interstital-free steel with ultra-fine grain structure

    T. Haruna, Y. Nakagawa, Y. Hirohata, D. Terada, N. Tsuji

    ICF 2017 - 14th International Conference on Fracture   1   163 - 164   2017

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    Publishing type:Research paper (international conference proceedings)  

    © 2017 ICF 2017 - 14th International Conference on Fracture. All rights reserved. The research have tried to reveal the effect of annealing temperature on susceptibility to hydrogen embrittlement (HE) of the interstitial-free steel with ultra-fine grain (UFG) structure produced by an accumulative roll-bonding (ARB) method. The as-ARBed specimen exhibited the UFG structure with a large tensile strength. As hydrogen was introduced to the specimen, a fracture strain decreased remarkably. As the annealing temperature rose to 673 K, the tensile strength was slightly diminished. The fracture strain of the annealed specimen with hydrogen increased drastically with a rise in the annealing temperature. As the temperature further rose above 773 K, almost no change in the strain was obtained between the specimens with and without hydrogen, and the strength decreased remarkably.

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  • Development of Measurement System for pH Distribution on Metal Surface under Atmospheric Corrosion Reviewed

    Youhei Hirohata, Kentaro Nishida, Takumi Haruna, Kazuhiko Noda

    JOURNAL OF THE JAPAN INSTITUTE OF METALS   81 ( 11 )   495 - 501   2017

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:JAPAN INST METALS  

    Thin water film is formed on metal surfaces that are exposed to the atmosphere. The conditions of this film change according to environmental factors, such as temperature, wind, and rainfall. Hence, it is difficult to investigate atmospheric corrosion on metal surfaces.
    This paper aimed to develop a measurement system for the pH distribution on a metal surface in simulated atmospheric environment. The surface pH distribution was measured with agar film including pH indicators and MgCl2. The pH indicators used were a universal indicator and an MR-BTB indicator. Agar film of 0.5 mm thickness was placed on an iron specimen. The specimen was set in a chamber with a relative humidity of 100% to prevent the agar film from drying out. The surface pH distribution was determined from the color of the agar film with an RGB color model. The surface pH distribution on the iron showed that anodic reactions produced acidic regions and cathodic reactions produced basic regions. The observed phenomena were the same as that found under a water droplet which contained the pH indicator and MgCl2. Therefore, we conclude that the agar film could simulate thin water film in an atmospheric environment and allow measurement of the surface pH distribution on iron under atmospheric corrosion.

    DOI: 10.2320/jinstmet.JAW201704

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  • Influences of Concentration and Thickness of MgCl2 Solution Layer on Pit Initiation of Type 304 Stainless Steel in Atmospheric Environment Reviewed

    Youhei Hirohata, Hiroki Ota, Takumi Haruna, Kazuhiko Noda

    JOURNAL OF THE JAPAN INSTITUTE OF METALS   81 ( 3 )   115 - 119   2017

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:JAPAN INST METALS  

    This paper aimed to investigate conditions for pit initiation on type 304 stainless steel under MgCl2 solution layer in atmospheric environment using a CCD camera system and a surface potential measurement equipment. A droplet of dilute MgCl2 solution was put on the specimen. The specimen was set in the chamber with a relative humidity of 33% in order to make the droplet dry into the layer. The CCD camera system was employed to observe the change in the shape of the droplet and in the specimen surface during the drying process. In addition, the surface potential measurement equipment was applied for monitoring the surface potential of the specimen with the layer. When the droplet of dilute solution became thin and saturated, pitting corrosion occurred and the surface potential rapidly lowered. By contrast, thick and saturated layer did not induce pitting corrosion and the surface potential indicated the relatively low and steady. Therefore, it was revealed that the atmospheric corrosion occurred on the steel under saturated MgCl2 solution layer whose thickness less than 0.2 mm.

    DOI: 10.2320/jinstmet.JAW201607

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  • Environment-assisted cracking of super-elastic TiNi alloy depending on solution pH and electrochemical potential Reviewed

    Takumi Haruna, Yosuke Fujita, Daiki Morihashi, Youhei Hirohata

    Materials Science Forum   879   709 - 713   2017

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    Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:Trans Tech Publications Ltd  

    The behavior of environment-assisted cracking (EAC) for super-elastic TiNi alloy was investigated as functions of solution pH and electrochemical potential. The specimen was immersed in sulfate solutions at various pHs, and subjected to a potentiostatic slow strain rate tensile test. As a result, the EAC map for the TiNi alloy as functions of the solution pH and the applied potential was successfully produced, and it was revealed that larger EAC susceptibility was obtained in the region of lower potential and lower pH. The tendency was quite typical for hydrogen embrittlement, but not similar to that of TiAl. The EAC susceptibility was classified by cathodic charge density, irrespective to pH nor potential: The charge density larger than 0.025 MC.m-2 induced a maximum EAC susceptibility.

    DOI: 10.4028/www.scientific.net/MSF.879.709

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  • Hydrogen absorption behavior of the steels containing Cr and Ni under cathodic polarization in sulfate solutions

    Takumi Haruna, Kazuki Takeuchi, Tomoki Kasahara, Yamato Nii, Youhei Hirohata

    EUROCORR 2017 - The Annual Congress of the European Federation of Corrosion, 20th International Corrosion Congress and Process Safety Congress 2017   2017

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    Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:Asociace koroznich inzenyru z.s.- AKI - Czech Association of Corrosion Engineers  

    Hydrogen absorption behavior of the steels containing Cr and Ni has been investigated under cathodic polarization in sulfate solutions by means of conventional electrochemical hydrogen permeation test. Good agreement of the empirical with the theoretical transient curves of hydrogen permeation current density suggested quasi-equilibrium condition to the absorption-desorption reaction of hydrogen at the surface. In addition, a diffusion coefficient obtained from the transient curve decreased with an increase in a concentration of the additional elements, and the decrement was enhanced much more by Cr than by Ni. A hydrogen concentration at the hydrogen absorption surface was almost proportional to a square root of the cathodic current density for any specimens. The slope increased with an increase in a content of the additional elements, and the increment was enhanced much more by Cr than by Ni. The two findings suggested that the additional elements of Cr and Ni attract hydrogen, and that the attraction effect of Cr was much more than that of Ni.

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  • Influence of concentrations of LiOH and Li2MoO4 on polarization curve of carbon steel in concentrated LiBr solutions Reviewed

    D. Morihashi, T. Irie, Y. Hirohata, T. Haruna

    Corros. Eng.   Vol.65, No.6, pp.202-207 ( 6 )   264 - 268   2016.12

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Japan Society of Corrosion Engineering  

    We have investigated influence of concentrations of LiOH and Li2MoO4 on corrosion behavior of SS400 carbon steel immersed in concentrated LiBr solutions at 393 and 438 K for a short period about 0.2 ks. The corrosion behavior was evaluated by measurement of polarization curve. As a result, the following were obtained: Addition of LiOH to 65 mass% LiBr solution induced suppression of cathodic current around the corrosion potential to shift the corrosion potential lower. Further, two-step active dissolution current was found around the corrosion potential and passive current in the higher potential region. On the other hand, addition of 0.03 mass% Li2MoO4 to 65 mass% LiBr + 0.2 mass% LiOH solution induced small suppression of cathodic current around corrosion potential, and more addition of 0.06 mass% made the cathodic current slightly increase. Two-step active dissolution and passivation phenomena were found in the anodic polarization curve like those in the solution without Li2MoO4. The anodic current density was almost independent of the concentration of Li2MoO4. Corrosion rates of the steel immersed in various solutions at 393 K for the short period were almost the same as 1.5 A·m-2. In the solutions at 438 K, corrosion rate decreased with an increase in LiOH concentration and increased with an increase in Li2MoO4 concentration.

    DOI: 10.3323/jcorr.65.264

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  • 高温濃厚LiBr水溶液中における炭素鋼の分極曲線に及ぼすLiOH濃度およびLi2MoO4濃度の影響

    森橋大樹, 入江智芳, 廣畑洋平, 春名 匠

    材料と環境   Vol.65, No.6, pp.264-268   2016.6

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  • Miscellaneous Thoughts about Branch Activity

    Haruna Takumi

    Zairyo-to-Kankyo   65 ( 2 )   43 - 44   2016

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    Language:Japanese   Publisher:Japan Society of Corrosion Engineering  

    DOI: 10.3323/jcorr.65.43

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  • Effect of Microstructural Defects on Hydrogen Absorption for Steels in Acidic Sulfate Solution

    Takumi Haruna, Yamato Nii

    ISIJ INTERNATIONAL   56 ( 3 )   392 - 396   2016

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:IRON STEEL INST JAPAN KEIDANREN KAIKAN  

    Effect of hardness of steels on hydrogen absorption behavior has been investigated by means of conventional electrochemical hydrogen permeation test. Empirical transient curves of hydrogen permeation current density were agreed with the theoretical one on the basis of Fick's second law with a fixed hydrogen concentration at the hydrogen absorption surface, C-0, at any time. The fact suggests quasi-equilibrium condition to the absorption-desorption reaction of hydrogen at the surface, and that correlation between C-0 and hydrogen absorption rate. As an analytical result of the transient, a diffusion coefficient of hydrogen, D, decreased with an increase in a hardness of the steel. On the other hand, the value of C-0 increased with an increase in the hardness. There was a good positive correlation between C-0 and an inverse of D in spite of difference in the hardness and the additional element. The fact may suggest that the microstructural defects attract hydrogen both in the bulk and on the surface of the steel, and the effect promotes hydrogen ad-atom absorbing into the iron specimen.

    DOI: 10.2355/isijinternational.ISIJINT-2015-283

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  • Role of the Electrochemical Potential and Solution pH to Environment-Assisted Cracking of Super-Elastic TiNi Alloy

    Takumi Haruna, Yosuke Fujita, Daiki Morihashi, Youhei Hirohata

    MATERIALS TRANSACTIONS   57 ( 12 )   2026 - 2032   2016

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:JAPAN INST METALS  

    The susceptibility to environment-assisted cracking (EAC) of super-elastic TiNi alloy was investigated as a function of the electrochemical potential and solution pH. The investigation was conducted using a slow-strain-rate tensile test apparatus with a potentiostat. The test solutions were sulfate solutions with various pH values adjusted by H2SO4 or NaOH. The alloy deforming under cathodic reaction fractured under the relatively small strain where the alloy was in the stress-induced martensitic phase. A larger EAC susceptibility was obtained at lower potential and lower pH, which indicates that this is a general feature of hydrogen embrittlement. The severe EAC region of TiNi alloy was different from that of TiAl alloy. The EAC susceptibility was strongly correlated with the cathodic charge density, irrespective of the pH or potential: a charge density below 0.025 MC m(-2) yielded almost no EAC; however, above 0.025 MC m(-2) EAC was induced, and the EAC susceptibility was independent of the charge density. Hydrogen in solid-solution state was detected in the alloy at a charge density below 0.025 MC m(-2), and hydride started to form at a density above 0.025 MC m(-2).

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  • Effect of Additional Element on Hydrogen Absorption for Iron in Acidic and Neutral Sulfate Solutions

    Takumi Haruna, Kazuki Takeuchi, Tomoki Kasahara, Yamato Nii

    ISIJ INTERNATIONAL   56 ( 3 )   378 - 384   2016

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    Effects of additional elements of Cr and Ni in iron on hydrogen absorption behavior have been investigated by means of conventional electrochemical hydrogen permeation test. Empirical transient curve of hydrogen permeation current density was agreed with theoretical one on the basis of Fick's second law with a fixed hydrogen concentration at the hydrogen absorption surface, C-0, at any time. The fact suggests quasi-equilibrium condition to the absorption-desorption reaction of hydrogen at the surface, and that correlation between C-0 and hydrogen absorption rate. As an analytical result of the transient, a diffusion coefficient decreased with an increase in a content of additional elements, and the decrement was enhanced much more by Cr than by Ni. C-0 was almost proportional to a square root of the cathodic current density at the hydrogen absorption surface for any specimens. The slope increased with an increase in a content of the additional elements, and the increment was enhanced much more by Cr than by Ni. There was a correlation between the slope and the diffusion coefficient, and the correlation suggested that the additional elements of Cr and Ni attract hydrogen. In addition, the attraction effect of Cr was much more than that of Ni. Under anodic potential region, the effect of additional element on C-0 was not clearly obtained in the solution of pH 2, but it is found that C-0 of the Cr-added steel was larger and that of the Ni-added steel was smaller than that of Fe in the solution of pH 6.

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  • Correlation between Bound Water and Stability of Anodic Oxide Film on Aluminum

    Takumi Haruna, Takao Ikeda, Masato Miyazaki, Akio Nishimoto, Youhei Hirohata

    Vol.56, No.12, pp.2000-2005   2015.11

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  • Diffusion Behavior of D2O in the Film on Fe Oxidized at High Temperature in Air

    Takumi Haruna, Tatuya Yamamoto, Hiroshi Miyairi, Toshio Shibata, Naoki Taniguchi, Keiko Sakamaki, Hirokazu Tachikawa

    Vol.64, No.5, pp.162-169   2015.9

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  • Correlation between amount of bound water and stability of passive film on Ti during passivation time in sulfuric acid solution

    Takumi Haruna, Suguru Ito, Keiichiro Kimoto, Akio Nishimoto

    Vol.19, No.12, pp.3589-3593   2015.9

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  • 分極測定を用いた硫化物分散型鉛フリー合金の腐食評価 Reviewed

    安田吉伸, 阿部弘幸, 松林良蔵, 丸山 徹, 春名 匠

    銅と銅合金   Vol.54, No.1, pp.113-118   2015.8

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  • 大気中でFeを高温酸化させた皮膜中へのD2Oの拡散浸透挙動

    春名 匠, 山本達也, 宮入洋志, 柴田俊夫, 谷口直樹, 坂巻景子, 立川博一

    材料と環境   Vol.64, No.5, pp.201-206   2015.5

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  • Development of Ti Alloys for Dental Devices with Corrosion Resistance to Fluoride Solutions

    Haruna Takumi

    CORROSION ENGINEERING   63 ( 5 )   309 - 315   2014

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    Titanium has been selected as the materials for several dental devices because of its excellent mechanical properties, biocompatibility, development of casting process and corrosion resistance to chloride solutions.Besides, fluoride is well utilized as an anticariogenic agent showing the reduction of demineralization, the enhancement of remineralization, the interference of pellicle and plaque formation, the inhibition of microbial growth and metabolism, and others. However, Ti has a nature to dissolve in aqueous fluoride solutions, so that there have been some reports regarding corrosion problem of the titanium dental devices. One of the countermeasure to the problem is to develop a new titanium alloy resistant to corrosion in the fluoride solutions. Therefore, the paper aims to introducing the overview of corrosion behavior of Ti in fluoride solutions and some recent trials to development of new Ti alloys corrosion-resistant to the fluoride solution.

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  • Effect of Potential on Hydrogen Evolution during Pitting of Aluminum

    Takumi Haruna, Daiki Nishiwaki, Midori Nishikawa

    Aluminium Alloys 2014 - ICAA14   794-796   107 - 111   2014

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    Effect of potential on hydrogen evolution during simulated pitting of aluminum has been investigated. Aluminum wire in 1.0 mm diameter was mounted in resin, immersed in 0.6 kmol.m(-3) NaCl solution and anodically dissolved in axial direction by applying a constant potential from -0.6 to -0.1 V-Ag/AgCl for 86.4 ks. In addition, a resistance of the solution in the crevice of the resin where the aluminum wire corroded was simultaneously measured by superimposing high-frequency alternating potential (Ep-p=10 mV) to the main potential. As higher main potential was applied, the corrosion depth increased. Hydrogen evolved at the corroded site although the anodic potentials were applied. The amount of hydrogen evolution increased as higher main potential was applied to the wire. An interfacial potential (E-int) at just the wire surface was calculated from applied main potential (E-app), solution resistance (R-sol) and current(I) as E-int = E-app - I.R-sol. The interfacial potential was about -0.7 to -1.0 V-Ag/AgCl, and became lower as the higher main potential was applied. The lower interfacial potential may cause hydrogen evolution in this case.

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  • フッ化物イオンを含む弱酸水溶液中におけるTi-Mg合金の耐食性

    春名 匠, 元家大介, 中川祐一, 山下直司, 大石敏雄

    日本金属学会誌   Vol.77, No.8, 328-333   2013.8

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  • Corrosion Resistance of Titanium-Magnesium Alloy in Weak Acid Solution Containing Fluoride Ions Reviewed

    Takumi Haruna, Daisuke Motoya, Yuichi Nakagawa, Naoji Yamashita, Toshio Oishi

    MATERIALS TRANSACTIONS   54 ( 2 )   143 - 148   2013

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    We have developed Ti-Mg alloy for dental material corrosion-resistant to aqueous fluoride solutions. Ti plates and granular Mg was put in a sealed vessel and heated at 950 degrees C, so Ti plates were exposed in the liquid and the vapor Mg phases. The conditions made Mg diffuse into the Ti plates to produce Ti-Mg alloy. The Ti-Mg alloy produced in the vapor Mg phase for 430 h achieved homogeneous distribution in Mg concentration of 0.2 at%. A Vickers micro hardness increased almost linearly with an increase in the Mg concentration, and the hardness of the homogeneous Ti-0.2at%Mg was about 1.2 times larger than that of Ti before alloying. It was confirmed that corrosion resistance of Ti in the fluoride solution was improved by alloying with Mg. The method using the vapor Mg phase contributed much more effective improvement of corrosion resistance than that using the liquid phase. The homogeneous Ti-0.2 at% Mg demonstrated a maximum corrosion resistance of all the specimens, by about 80 times to Ti.

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  • Corrosion Resistance of Titanium-Magnesium Alloy in Weak Acid Solution Containing Fluoride Ions

    Takumi Haruna, Daisuke Motoya, Yuichi Nakagawa, Naoji Yamashita, Toshio Oishi

    JOURNAL OF THE JAPAN INSTITUTE OF METALS   77 ( 8 )   328 - 333   2013

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    We have developed Ti-Mg alloy for dental material corrosion. resistant to aqueous fluoride solutions. Ti plates and granular Mg was put in a sealed vessel and heated at 950 degrees C, so Ti plates were exposed in the liquid and the vapor Mg phases. The conditions made Mg diffuse into the Ti plates to produce Ti. Mg alloy. The Ti. Mg alloy produced in the vapor Mg phase for 430 h achieved homogeneous distribution in Mg concentration of 0.2 at%. A Vickers micro hardness increased almost linearly with an increase in the Mg concentration, and the hardness of the homogeneous Ti-0.2 at%. Mg was about 1.2 times larger than that of Ti before alloying. It was confirmed that corrosion resistance of Ti in the fluoride solution was improved by alloying with Mg. The method using the vapor Mg phase contributed much more effective improvement of corrosion resistance than that using the liquid phase. The homogeneous Ti-0.2 at%. Mg demonstrated a maximum corrosion resistance of all the specimens, by about 80 times to Ti.

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  • Effects of stress and sigma value at grain boundary on crack propagation for sensitized 304 stainless steel with coarse grains

    Takumi Haruna, Takayuki Shimizu, Masayuki Kamaya

    EUROCORR 2013 - European Corrosion Congress   2013

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    Type 304 stainless steel foil was heated to prepare the specimen with coarsegrains whose size was over the foil thickness. Most of grain boundaries (gBs) of the specimen were perpendicular to the surface. The specimen was then sensitized to be subjected to an environment-assisted cracking (eAC) test. Thereafter Σ values of cracking GBs were determined with electron back scattering diffraction (eBSD) method. Most of GBs where cracks were initiated and propagated had a Σ value more than 27, i.e., 'random GB'. The GBs where cracks were initiated had a stress normal to a GB plane (σn) more than 150 MPa and Σ value more than 23. The GBs where cracks propagated had σn more than 10 MPa and Σ value more than 23. The GBs where cracks arrested had two GB characteristics
    one was that of Σ value less than 19 and any σn, and the other was that of Σ value more than 19 and σn less than 100 Mpa.

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  • 粗粒SUS304鋼箔の鋭敏化感受性と粒界性格との相関性 Reviewed

    春名 匠, 清水貴之, 釜谷昌幸

    日本金属学会誌   Vol.76, Vol.5, pp.314-320   2012.5

  • Correlation between Grain Boundary Character and Susceptibility of Sensitization for SUS304 Stainless Steel Foil with Course-Grained Structure Reviewed

    Takumi Haruna, Takayuki Shimizu, Masayuki Kamaya

    JOURNAL OF THE JAPAN INSTITUTE OF METALS   76 ( 5 )   314 - 320   2012.5

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    We have investigated correlation between grain boundary character and susceptibility to sensitization using SUS304 stainless steel foil with coarse grained structure. The steel foil of 100 mu m thickness was heated at 1473 K for several periods, and a heating time of 604.8 ks was selected to prepare the specimen with coarse grained structure, in which a median of grain size was 229 mu m. In the specimen, most of grain boundary planes were parallel to the thickness direction. The specimen was sensitized and subjected to the grain boundary corrosion test in oxalic acid solution. Thereafter, the orientation of each grain and the Sigma value of each grain boundary were determined by the electron backscattering diffraction (EBSD) method. The corrosion width at the grain boundary positively corresponding to a degree of sensitization increased with an increase in Sigma value, and became stable as the value was more than 19. In addition, the corrosion width at Sigma 3 grain boundary was scattered. Since most of the grain boundary planes were parallel to the thickness direction of the specimen, orientation to each plane of Sigma 3 grain boundary was determined from the EBSD results, and the degree of coincidence for atom sites on the Sigma 3 plane was analyzed. As a result, orientations of the observed Sigma 3 planes were parallel to the common rotation axes characterizing Sigma 3 coincidence site lattice (CSL) in space, and the Sigma 3 grain boundary had three types of planes with different CSL. An area of the unit cell for CSL of the grain boundary plane identified as Sigma 3 was selected as an index of grain boundary character, and an increase in the area correlated to an increase in the corrosion width.

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  • Development of Apparatus for Detecting Moisture Absorbed into and Desorbed out of Steel Rust Reviewed

    HARUNA Takumi, SHOJI Yuki, KASHIMA Kazuyuki, KAMIMURA Takayuki, MIYUKI Hideaki

    CORROSION ENGINEERING   Vol.61, No.3, pp.113-119 ( 3 )   113 - 119   2012.3

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    We have developed the apparatus for monitoring changes in humidity in the test environment and mass of the rusted steel in order to detect the moisture absorbed into and desorbed out of the steel rust. The rusted steel was set in the container in which the air was controlled to be dry or humid. Change in mass of the rusted steel due to absorption or desorption of moisture was continuously monitored by an electric analytical microbalance, and humidity in the container was spontaneously determined by a digital hygrometer. In the air of a relative humidity (RH) more than 90%, mass of the rusted steel increased rapidly and parabolically due to absorption of moisture into the rust, and then increased gradually and linearly due to adsorption of moisture on the surface. As the test lasted, the mass oscillated ; sudden decrease in mass corresponded to falling a water droplet with some pieces of the rust, and linear increase in mass thereafter did to re-adsorbing moisture. In the case of RH less than 90%, mass change was similar to that of RH more than 90%, but there was no falling of a water droplet from the rusted steel. It is revealed from the long-term test in the air of RH 88% that mass of moisture absorbed into the rust was independent of test time and that mass of new rust increased linearly with test time. In addition, it is suggested that the mass increase rate, that is corrosion rate, corresponds to the cathodic reaction rate limited by diffusion of dissolved oxygen in the thick water film.

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  • Susceptibility to Hydrogen Embrittlement of IF Steel with Ultrafine-Grained Structure Produced by Accumulative Roll-Bonding Process

    T. Haruna, Y. Nakagawa, D. Terada, N. Takata, N. Tsuji

    PRICM 7, PTS 1-3   654-656   1235 - +   2010

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    We have investigated the susceptibility to hydrogen embrittlement of interstitial-free (IF) steel with ultrafine-grained microstructure produced by accumulative roll-bonding (ARB) process. The ARB process was conducted to as-received IF steel at 773 K, and repeated to five cycles. The as-received and the ARBed IF steels were cut into tensile specimens, and then hydrogen was electrochemically charged to the specimens in a sulfuric acid solution of pH 2.5 at a cathodic current density of 50 A m(-2) for several charging times. Immediately after the hydrogen-charging process, tensile test was conducted at ambient temperature and an initial strain rate of 3.3 x 10(-4) s(-1). Besides, state and amount of hydrogen absorbed in the specimen were determined with a thermal desorption gas spectroscopy (TDS) at a heating rate of 5.6 x 10(-2) K s(-1). As a result, almost no hydrogen was absorbed in the as-received IF steel charged for a long time of ca. 300 ks, and a fracture strain of the steel was independent of the charging time. On the other hand, amount of hydrogen in the 5-cycle ARBed steel increased with an increase in the charging time, and the fracture strain decreased with an increase in the charging time, indicating that the ARBed steel exhibited susceptibility to hydrogen embrittlement.

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  • Development of Titanium-Calcium Alloy Resistant to Aqueous Fluoride Solutions

    Takumi Haruna, Itsuki Shinohara

    THERMEC 2009, PTS 1-4   638-642   564 - 569   2010

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    It has been tried to develop Ti-Ca alloys which demonstrates corrosion resistance in an aqueous fluoride solutions. The Ti-Ca alloys were produced by diffusion-metallizing method A Ti plate and Ca grains were put in a sealed container of stainless steel As the container was heated at 1000 degrees C, Ca was melted and partially vaporized in the inner space Ca then contacts and permeats into the Ti plate to metallize In a holding time of 450 h, the alloy surface consisted of two layers, the first was oxide layer and the second was metal layer of about 200 pm thick. A Vickers micro hardness of the second layer was quite large, upto about 600 Hv. Evaluation of corrosion resistance for the second layer and the inner part was carried out by electrochemical potentiokinetic method. Test solutions were aqueous fluoride solutions produced with HF and NaF. A concentration of fluoride ion was fixed to 0.024 kmol m(-3), and pH of the solution was varied from 3 4 to 4 7. As a result, both Ti and Ti-Ca alloy were passivated under natural immersion condition in the solution of pH 4.7. At pH 3 4, on the other hand, Ti was actively dissolved, but Ti-Ca alloy was still passivated, that means Ti-Ca alloy performs much better corrosion resistance than Ti.

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  • Potential-pH map for environment-assisted cracking of Ti-6Al-4V

    Takumi Haruna, Masaya Hamasaki, Toshio Shibata

    Environment-Induced Cracking of Materials   Vol.1, pp.359-366.   359 - 366   2008

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    This chapter investigates the influences of potential and pH on environment-assisted cracking behavior (EAC) in order to identify the effects of environmental factors on EAC. EAC tests are conducted with the slow strain rate technique. The material chosen is Ti-6AI-4V. An aqueous solution of Na2SO4 is used for EAC tests. The solution is prepared with distilled water and reagent-grade chemicals. The slow strain rate tensile (SSRT) test equipment SSRT-MINI1000T with a glass cell is employed for the tests. The side and fracture surfaces of specimens are analyzed with a scanning electron microscope. The density of the cathodic current is observed during the EAC test at all potentials except +200 mV, at which the density of anodic current is observed. The current densities are virtually constant throughout the test period, and the density of cathodic current increases with the decrease in potential. Identical trends are observed at pH 3 and 7. At pH 3, the density of the cathodic current increases with decreasing potential. The maximum stress is almost identical to that in air, although it appears to decrease slightly at -300 mV. Therefore, almost no EAC susceptibility is observed at pH 3. Similar trends are observed at pH 7. At pH 1, a unique behavior in maximum stress against potential is observed. © 2008 Elsevier Ltd All rights reserved.

    DOI: 10.1016/B978-008044635-6.50034-0

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  • Development of Ti-Mg Alloys Resistant to Aqueous Fluoride Solution Reviewed

    Takumi Haruna, Daisuke Motoya, Yuichi Nakagawa, Naoji Yamashita, Toshio Oishi

    Ti-2007 Science and Technology, edited by M. Niinomi, S. Akiyama, M. Ikeda, M. Hagiwara, K. Maruyama, The Japan Institute of Metals   Vol.II, pp.1429-1432   2007.12

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  • Influence of local stress on initiation behavior of stress corrosion cracking for sensitized 304 stainless steel

    Masayuki Kamaya, Takumi Haruna

    CORROSION SCIENCE   49 ( 8 )   3303 - 3324   2007.8

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    To investigate the influence of local stress on initiation behavior of stress corrosion cracking (SCC) for sensitized Type 304 stainless steel, cracking process during constant load SCC test was monitored and recorded with an in situ crack observation system. The changes in number of cracks, sum of crack length and cracked area on the specimen surface with test time were identified from the cracking images analyzed by image processing. In the SCC tests, many cracks were initiated and coalesced on the surface, and the coalescence of cracks played an important role to primary crack growth. The influence of applied stress on crack initiation was different from that on crack growth. In addition, there was a difference between influences of stress on incubation period to crack initiation and crack initiation rate. Due to these differences, a stress of 0.8S(y) was thought to cause relatively many cracks compared with 0.5S(y) and 1.3S(y), (S-y = 200 MPa). Through quantitative estimation of distribution in local stress around a crack by finite element analysis method, it was deduced that the crack initiation is influenced not only by bulk stress applied at the end of the body, but also by local stress formed around pre-existing cracks. According to pre-existing cracks, stress enhancement accelerates the crack growth, while the stress relaxation causes the suppression of new crack initiation. Based on the experiment and analysis results, three types of growth process were suggested, which are caused by propagation itself, by new crack initiation at vicinity of the crack tip, and by coalescence of approaching cracks. Then, it was concluded that, in order to predict/simulate the cracking behavior of this SCC system, the influence of local stress on the crack initiation should be taken into account. (c) 2007 Elsevier Ltd. All rights reserved.

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  • Degradation of the mechanical strength of Al alloys hy electrochemically introduced hydrogen

    Shinji Fujimoto, Takashi Kouno, Tomohide Tsuji, Takumi Haruna

    ECS Transactions   3 ( 31 )   185 - 190   2007

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    The high strength Al alloys, 7N01, 6061 and 5083, were examined using slow strain rate testing in chloride-containing acid to neutral solutions under potentiostatic control. Large amounts of hydrogen absorption occurred at potentials above the breakdown potential. In this potential range, the mechanical strength of the alloys is degraded manly by severe general corrosion but hydrogen embrittlement may also occur. On the other hand, polarisation at more negative potentials where there is intense hydrogen evolution does not necessarily lead to a large amount of hydrogen entry except for the case of the alloy 5083, which suffered from hydrogen embrittlement induced by hydride formation around precipitates. copyright The Electrochemical Society.

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  • Crack initiation model for sensitized 304 stainless steel in high temperature water

    Masayuki Kamaya, Takumi Haruna

    CORROSION SCIENCE   48 ( 9 )   2442 - 2456   2006.9

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    To investigate the initiation behavior of stress corrosion cracking (SCC) for sensitized Type 304 stainless steel in high temperature water, a constant load SCC test method combined with in situ crack observation technique was employed. The in situ crack observation system allowed us to detect small cracks of at least 100 mu m. As a result, a fracture time decreased with an increase in an applied stress. The first cracks were observed at most 3 h before the specimen was fractured under all the stress conditions. After that, many cracks were initiated in a short time to fracture. The fracture was caused by coalescence of multiple cracks rather than by growth of some primary cracks. The simulation model for surface crack initiation was newly developed using a Monte Carlo method, which was based on damage mechanics and stress analysis around the existing cracks. The simulation could represent the empirical results of changes in the crack distribution and the cumulative number of cracks during the SCC tests. It was concluded, therefore, that the crack initiation process should be considered in simulating the life prediction of the material in this SCC system. (c) 2005 Elsevier Ltd. All rights reserved.

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  • Initiation model for stress corrosion cracking of 304 stainless steel in high temperature water Reviewed

    Masayuki Kamaya, Takumi Haruna

    INSS Journal   Vol.12, pp.222-229   2005.10

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  • Electrochemical Conditions for Environment-Assisted Cracking of 6061 Al Alloy Reviewed

    Takumi Haruna, Takashi Kouno, Shinji Fujimoto

    Corrosion Science   Vol.47, No.10, pp.2441–2449   2005.10

  • Influences of potential and pH on initiation of environment-assisted cracking of Ti-6Al-4V

    T Haruna, M Hamasaki, T Shibata

    MATERIALS TRANSACTIONS   46 ( 10 )   2190 - 2196   2005.10

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    We have investigated the influences of potential and pH on environment-assisted cracking (EAC) of Ti-6Al-4V in aqueous solutions. The EAC test was conducted by slow strain rate technique. Solution pH was controlled from I to 7, and applied potential was fixed between -1.8 and +0.2 V-SHE. In the solutions of pHs 3 and 7. mechanical properties of the material was almost independent of applied potential. This means that the material shows almost no EAC susceptibility in the potential-pH region for the EAC test period. At pH 1, however, both maximum stress and fracture strain changed with applied potential, and showed minimum values at an applied potential of about -1.0 V-SHE. According to surface analyses by scanning electron microscopy and X-ray diffraction technique, some cracks and Ti hydride were detected from only the specimens fractured at about -1.0 V-SHE in the solution of pH 1. Therefore, it can be concluded that Ti-6Al-4V is most susceptible to the EAC at about -1.0 V-SHE and a pH less than 1. The EAC region was in good agreement with Ti ion stable region in a potential-pH diagram of Ti/water system, and was quite similar to that on the EAC of TiAl.

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  • Inhibition effect of metal cations to intergranular stress corrosion cracking of sensitized Type 304 stainless steel

    SH Zhang, T Shibata, T Haruna

    CORROSION SCIENCE   47 ( 4 )   1049 - 1061   2005.4

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    Inhibition effect of metal cation to intergranular stress corrosion cracking (TGSCC) of sensitized Type 304 stainless steel has been investigated by slow strain rate technique (SSRT) with a dynamic crack observation system. The SCC tests were conducted in fully-deaerated aqueous solutions containing various metal sulfates of 10(-5) kmol/m(3) at 95 degrees C. Metal cations of Na+, Ca2+ Mn2+ and Zn2+ were selected in this study, and were characterized by a hardness based on the hard and soft acids and bases (HSAB) concept. As a result, it was found that a hard metal cation in the test solution increased crack initiation time and decreased mean crack initiation frequency. In other words, metal cations with larger hardness have an ability of suppressing initiation process of the IGSCC. On the other hand, apparent mean crack velocity was independent of the hardness of metal cation. The finding that the metal cations with large hardness inhibit initiation of the IGSCC was able to be rationally explained on the basis of the passive film model combined with the HSAB concept. (c) 2004 Elsevier Ltd. All rights reserved.

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  • Analysis of initiation and propagation of stress corrosion cracks in sensitized type 304 stainless steel in high-temperature water

    T Haruna, S Zhang, T Shibata

    CORROSION   60 ( 12 )   1104 - 1112   2004.12

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    A slow strain rate testing apparatus equipped with an autoclave as well as with an in-situ crack observation system has been newly developed. Using this system, the growth behavior of multiple cracks in high-temperature water up to about 300 degreesC could be observed in-situ. In this study, the initiation and propagation of stress corrosion cracks in sensitized Type 304 (UNS S30400) stainless steel immersed in 10(-4) kmol/ m(3) sodium sulfate (Na2SO4) solution from 100 degreesC to 250 degreesC were investigated. It was found that stress corrosion cracking (SCC) susceptibility evaluated from the time to fracture increased with an increase in temperature. The in-situ observations of the cracks revealed the following:
    -The time to initiate the first crack decreased with art increase in temperature.
    -The cumulative number of cracks increased almost linearly with deformation time at any temperature.
    -Both the final number of cracks and the crack initiation frequency exhibited a maximum at 150 degreesC.
    -The distribution in the crack propagation rates was found to fit the Weibull probability distribution. The mean crack propagation rate increased with an increase in temperature according to the Arrhenius relation with an estimated activation energy of about 2.1 kcal/mol.

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  • Estimation of Corrosion Rate of Carbon Steel in Bicarbonate Aqueous Solutions by Using Electrochemical Noise

    Takumi Haruna, Yasuyuki Morikawa, Shinji Fujimoto, Toshio Shibata

    Proc. of 13th Asian-Pacific Corrosion Control Conference   2003.12

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  • Effect of strain rate on environment-assisted cracking of TiAl in aqueous solution

    T Haruna, T Sundararajan, S Fujimoto, T Shibata

    HYDROGEN EFFECTS ON MATERIAL BEHAVIOR AND CORROSION DEFORMATION INTERACTIONS   pp. 691-698   691 - 698   2003

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    In previous work, we had investigated environment-assisted cracking (EAC) behavior of gamma-TiAl in 0.05 M sulfate solutions as functions of pH and potential by using slow strain rate tensile test, and plotted the EAC susceptibility in the potential-pH diagram of Ti-H2O and Al-H2O Systems. From the results, we had revealed that the EAC susceptibility was in distinct agreement with the diagram of Ti-H2O system, and especially severe EAC susceptibility located in Ti ion (i.e., Ti2+, Ti3+) stable region. In this work, we have extensively investigated the effect of strain rate in the range from 10(-3) to 10(-7) s(-1) on the EAC susceptibility of the material in the same solution of pH 3. At Ti oxide stable potential of +200 mV, the EAC susceptibility was almost independent of the strain rate, similar to that under vacuum condition. While, the susceptibility was found to increase with lowering the strain rate at Ti hydride stable potential of -2000 mV. At Ti ion stable potential of -1250 mV, tendency of EAC susceptibility with strain rate was similar to that at -2000 mV. However, a decrease in the susceptibility was found at the slowest strain rate. Xray diffraction method indicated that the additional peak relating to hydride presence at -1250 mV, although only a substrate TiAl peak was found at -200 mV. At -2000 mV, no hydride peak over the strain rate range was evident except for the slowest strain rate. The intensity of the hydride peak increased with lowering the strain rate except for the lowest strain rate where the intensity goes down at -1250 mV. At -2000 mV, on the other band, the susceptibility decreased with a decrease in the strain rate, even where no hydride detected by a conventional system. It is concluded that the very thin hydride may induce the EAC of the material, and the susceptibility increases with the increase in the amount of hydride.

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  • Development of Scanning Laser-Enhanced Electrochemical Microscopy for visualizing hydrogen distribution on a steel

    T Haruna, S Ohtsuka, T Shibata

    ISIJ INTERNATIONAL   43 ( 4 )   482 - 488   2003

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    A Scanning Laser-Enhanced Electrochemical Microscope for Hydrogen detection (H-SLEEM) has been developed in order to in-situ visualize the distribution of hydrogen localized on a steel surface. Introduction and detection of hydrogen for the steel sheet was conducted by hydrogen permeation technique with a pair of electrochemical cells. When the hydrogen detection side under hydrogen permeation is irradiated with focused Ar laser, anodic current relating to hydrogen oxidation reaction is thermally enhanced at the irradiation spot and then anodic current Increment corresponding to the hydrogen permeation rate at the spot is expected to be determined. In the case that whole the hydrogen detection side was irradiated with diffused laser, the anodic current increased and the current increment increased with an increase in the hydrogen permeation current. The use of focused laser also permitted the measurement of the anodic current increment depending on the hydrogen permeation current. The modulated laser provided more stable and reproducible current increment. When the specimen whose hydrogen entry side was masked except for a small exposed area in center was employed and the modulated laser was raster-scanned under hydrogen permeation, a very clear image of the two-dimensional distribution in the current increment corresponding to local hydrogen permeation rate on the detection side was obtained. It is concluded that the H-SLEEM can successfully visualize the localized hydrogen distribution on the steel surface.

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  • Electrochemical Noise Analysis for Estimation of Corrosion Rate of Carbon Steel in Bicarbonate Solutions Reviewed

    Takumi Haruna, Yasuyuki Morikawa, Shinji Fujimoto, Toshio Shibata

    Corros. Sci.   Vol.45, No.9 pp.2093-2104   2002.9

  • Stress Corrosion Cracking of Annealed Carbon Steel in Aqueous Bicarbonate Solution Reviewed

    Takumi Haruna, Liehong Zhu, Toshio Shibata

    Corros. Sci. and Tech.   Vol.31, No.4, pp.299-305   2002.8

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  • Environment-assisted cracking of gamma titanium aluminide in aqueous sulfate solutions

    Takumi Haruna, Taku Iwata, Thiyagarajan Sundararajan, Toshio Shibata

    Materials Science and Engineering A   329 ( 331 )   745 - 749   2002

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    Environment-assisted cracking (EAC) of γ-TiAl has been investigated from electrochemical viewpoint. The TiAl was forged at 1373 K and annealed at 1073 K for 7.2 ks. The specimen whose potential was controlled was tested in aqueous sulfate solutions of various pHs at room temperature by using a slow strain rate tensile testing apparatus. The experimental EAC results evaluated by the maximum stress was discussed on the basis of the potential-pH diagram of Al and Ti/water system. It was revealed that the diagram of Ti/water system can predict the EAC susceptibility of TiAl, although the diagram of Al/water system shows almost no relation to the susceptibility. The results suggest that the EAC of TiAl is controlled by the stability of Ti oxide, hydride, and ion on the solution/substrate interface, which affect the entry of hydrogen into the material. © 2002 Elsevier Science B.V. All rights reserved.

    DOI: 10.1016/S0921-5093(01)01654-9

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  • Effect of sulfate ion on corrosion of carbon steel in carbonate/bicarbonate solutions

    Takumi Haruna, Koji Domoto, Toshio Shibata

    Zairyo to Kankyo/ Corrosion Engineering   51 ( 8 )   350 - 355   2002

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    We have investigated the effect of sulfate ion on corrosion behavior of SM 400 B carbon steel in carbonate/bicarbonate solutions at 343 K by using a conventional potentiokinetic method with potential scan rate of 0.1 mV·s-1. In the solution containing sulfate less than 0.001 kmol·m-3, there are two active anode peaks and passive region. Addition of sulfate more than 1.0 kmol·m-3 gave cathodic current between the two active peaks and lowered pitting potential. The active peak current density at lower potential increased linearly with increase in equilibrium concentration of bicarbonate. This suggests to result from the formation of iron complex with bicarbonate ion for the active dissolution of iron. Cathodic polarization curves of Pt in the test solution showed that the increase in the concentration of sulfate led to the linear increase in cathodic current around the potential between two active peaks. Accordingly, it is concluded that sulfate ion can act as oxidant against the natural corrosion of the steel in this environment. Pitting potential of the steel was lowered with increase in the concentration of sulfate in concentrated region. In the same concentration of sulfate, the pitting potential increase with increase in pH. The trend suggests the retardation of the pitting is due to the solution properties of high pH and high buffer capacity.

    DOI: 10.3323/jcorr1991.51.350

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  • Role of Surface Properties on the EAC Behaviour of Gamma TiAl Invited

    Thiyagarajan Sundararajan, Takumi Haruna, Shinji Fujimoto, Toshio Shibata

    2001.2

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  • Effect of intensity of ultra-violet light on inhibition of stress corrosion cracking for sensitized SUS304 stainless steel

    T Haruna, K Onishi, T Shibata

    JOURNAL OF THE JAPAN INSTITUTE OF METALS   65 ( 2 )   128 - 133   2001.2

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    The effect of irradiation of ultra-violet(UV) light on stress corrosion cracking(SCC) behavior for sensitized SUS304 stainless steel in a deaerated 10(-3) kmol.m(-3) NaCl solution at 368 K has been investigated by using a slow strain rate testing(SSRT) apparatus with a dynamic observation system. The UV light, whose range of wavelength was from 250 to 400 nm, was emitted by a mercury lamp, and was irradiated to the specimen through the test solution. In order to change an intensity of the UV light, some neutral density filters were set in front of the quartz glass window on the cell. A potential of -200 mV(Ag/AgCL) was applied to the specimen before and during SSRT, and the UV light was irradiated up to the strain showing almost the yield stress. It was obvious that the SCC initiation was inhibited by the UV light irradiation to the specimen during SSRT. Crack initiation frequency varied with the light intensity, and an optimum intensity range existed for inhibiting crack initiation completely. On the other hand, the crack propagation rate showed almost no dependence on the irradiation conditions. In the case that the UV light was irradiated to the shielding material mounted in front of the specimen, a lot of cracks were initiated on the specimen, similar to the case without irradiation. This fact indicates that the SCC is not influenced by the solution chemistry altered by the UV light irradiation.

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  • Potential-pH region for environment-assisted cracking of gamma titanium aluminide

    T Haruna, T Shibata, T Iwata, T Sundararajan

    INTERMETALLICS   8 ( 8 )   929 - 935   2000.8

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    Environment-assisted cracking (EAC) of gamma-TiAl has been investigated from electrochemical viewpoint. The material whose potential was controlled was tested in aqueous sulfate solutions of various pHs at room temperature by using a slow strain rate tensile testing apparatus. The TiAl forged at 1373 K and annealed at 1073 K for 7.2 ks was used in the EAC test. It was found in the alkaline and the natural solution that maximum stress was independent of the potential in higher potential region, and decreased with decrease in the potential in the lower potential region. In acidic solution, the maximum stress changed with the potential as follows; the maximum stress was independent of the potential above -200 mV(SHE), decreased with decrease in the potential between -200 and -1000 mV(SHE), and increased with decrease in the potential below -1000 mV(SHE). The experimental EAC results was discussed on the basis of the potential-pH diagram of Al and Ti/water system. It was revealed that the diagram of Ti/water system can predict the EAC susceptibility of TiAl, although the diagram of Al/water system shows almost no relation to the susceptibility. Therefore, the EAC of TiAl is controlled by the stability of Ti oxide, hydride, and ion on the solution/base material interface, which affect the entry of hydrogen into the material. (C) 2000 Elsevier Science Ltd. All rights reserved.

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  • A HSAB concept applied to inhibition effect of anions on IGSCC of sensitized type 304 stainless steel

    SH Zhang, T Shibata, T Haruna

    CORROSION SCIENCE   42 ( 6 )   1071 - 1081   2000.6

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    The effect of concentration and type of anions on stress corrosion cracking of sensitized type 304 stainless steel was investigated by slow strain rate test (SSRT) with a dynamic cracking observation system. It was found that difference of anion type added into pure water exerted a significant effect on crack initiation time and mean crack initiation frequency. Some anions, such as OH- and B4O72-, can suppress, while others, such as S2O32- and SO42-, accelerate crack initiation. The effect of anion type on the crack initiation behavior was explained on the basis of the passive film model proposed by Okamoto and Shibata and a HSAB (hard and soft acids and bases) concept. The anion having a larger hardness value was found to show a longer crack initiation time or to delay the crack initiation. The anion with a larger hardness, that is expected to show a stronger affinity to proton, is considered to accelerate deprotonization, and to enhance the repassivation process. Consequently, the harder anion is expected to induce a more perfect passive film more rapidly, and then to retard the crack initiation more effectively. (C) 2000 Elsevier Science Ltd. All rights reserved.

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  • Statistical approach for evaluating SCC initiation and propagation behavior of sensitized Type 304 stainless steel

    T Shibata, S Zhang, T Haruna

    JOURNAL DE PHYSIQUE IV   10 ( P6 )   185 - 190   2000.4

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    The crack initiation and propagation behavior of a sensitized Type 304 stainless steel in distilled water containing small amounts of Na2SO4 or Na2B4O7 impurities was investigated by using slow strain rate technique (SSRT) with an insitu cracking observation system, and analyzed with a statistical approach. It was found that the crack initiation time for the steel in Na2SO4 or Na2B4O7 solutions obeyed the exponential distribution, while K-ISCC and crack velocity obeyed the Weibull distribution. An increase in Na2B4O7 concentration decreased the SCC susceptibility of the steel by delaying crack initiation time, reducing the crack initiation rate and increasing K-ISCC. In contrast, an increase in Na2SO4 concentration increased SCC susceptibility of the steel by shortening crack initiation time and accelerating crack propagation.

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  • Effects of potential and concentration of bicarbonate solution on stress corrosion cracking of annealed carbon steel

    Takumi Haruna, Liehong Zhu, Makoto Murakami, Toshio Shibata

    Zairyo to Kankyo/ Corrosion Engineering   49 ( 3 )   144 - 149   2000

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    Effects of potential and concentration of bicarbonate on stress corrosion cracking of annealed SM 400 B carbon steel has been investigated in bicarbonate solutions at 343 K. The surface of annealed specimen had decarburized layer of about 0.5 mm thickness. A potentiostatic slow strain rate testing apparatus equipped with a charge coupled device camera system was employed to evaluate SCC susceptibility from the viewpoint of the crack behavior. In a constant bicarbonate concentration of 1 M, cracks were observed in the potential range from -800 to 600 mVAg/AgCl, and especially, the initiation and the propagation of the cracks were accelerated at -600 mV. At a constant potential of -600 mV, cracks were observed in the concentration range from 0.001 to 1 M, and the initiation and the propagation of the cracks were suppressed as the concentration decreased. Polarization curves for the decarburized surface were measured with two different scan rates. High SCC susceptibility may be expected in the potential range where the difference between the two current densities is large. It was found in this system that the potential with the maximum difference in the current density was -600 mV for 1 M bicarbonate solution, and the potential increased with a decrease in the concentration of bicarbonate. This means that an applied potential of -600 mV provides the highest SCC susceptibility for 1 M bicarbonate solution, and that the SCC susceptibility decreases as the concentration decreases. These findings support the dependence of the actual SCC behavior on the potential and the concentration of bicarbonate.

    DOI: 10.3323/jcorr1991.49.144

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  • Effects of annealing conditions on stress corrosion cracking of carbon steel in aqueous bicarbonate solution

    Takumi Haruna, Liehong Zhu, Toshio Shibata

    Zairyo to Kankyo/ Corrosion Engineering   49 ( 3 )   138 - 143   2000

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    Effects of annealing conditions on stress corrosion cracking (SCC) of SM 400 B carbon steel has been investigated in 1 M sodium bicarbonate solution at 343 K. A potentiostatic slow strain rate test equipped with a charge coupled device camera system was employed to evaluate SCC susceptibility from the viewpoint of the crack behavior. Fixing an annealing time of 3.6 ks, no SCC appeared on the specimens annealed below 973 K, but intergranular SCC occurred beyond 1073 K. In the case that the SCC occurred, an increase in annealing temperature led to a decrease in crack initiation time and an increase in crack propagation rate. Fixing an annealing temperature of 1173 K, it is found that the SCC occurred in the annealing time range from 0.6 to 86.4 ks and that the fracture strain showed maximum at 3.6 ks. Analyzing the crack behavior, crack initiation time and crack propagation rate were found to be maximum and minimum at 3.6 ks, respectively. Thus, it was concluded that the maximum fracture strain at 3.6 ks resulted from minimum SCC susceptibility evaluated by initiation as well as propagation of the cracks. On the other hand, the observation of microstructure of the specimen revealed that the specimen surface suffered from decarburization during the annealing treatment beyond 1073 K, and the SCC always occurred on the specimen showing the decarburized structure.

    DOI: 10.3323/jcorr1991.49.138

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  • Passive Film Modification of Stainless Steels for Improving Corrosion Resistance

    Toshio Shibata, Shinji Fujimoto, Osamu Yamazaki, Takumi Haruna

    1999.11

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  • Photoinhibition of stress corrosion cracking of sensitized SUS304 stainless steel

    T Haruna, K Onishi, T Shibata

    JOURNAL OF THE JAPAN INSTITUTE OF METALS   63 ( 10 )   1365 - 1366   1999.10

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    Effect of irradiation by ultra-violet (UV) light on stress corrosion cracking (SCC) of sensitized SUS304 stainless steel in a deaerated 10(-3) kmol.m(-3) NaCl solution has been investigated by using a slow strain rate testing (SSRT) apparatus with a dynamic observation system. The SCC initiation was inhibited by the UV light irradiation to the specimen during SSRT. Change in the light intensity led to the change in crack initiation frequency. The maximum inhibition effect was observed at an optimum intensity. However, crack propagation rate showed almost no significant dependence on any irradiation conditions.

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  • Environment-assisted cracking of Ti in methanol solutions containing CaCl2

    T Haruna, M Yamamoto, T Shibata

    JOURNAL OF THE JAPAN INSTITUTE OF METALS   63 ( 10 )   1327 - 1331   1999.10

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    Environment-assisted cracking (EAC) of Ti in methanol solutions containing various concentrations of CaCl2 has been investigated by using a slow strain rate testing (SSRT) apparatus with dynamic observation system. In the EAC test, water content in the solutions was strictly controlled and the test solution was fully deaerated. Like the case of HCl addition, it was observed that cracks were initiated from black pits generating during the test and that the cracking mode was intergranular at the initial stage and transgranular at the final stage of the crack propagation. Under open circuit condition, cracking occurred only at 0.02 and 0.2 kmol.m(-3) CaCl2 and the maximum corrosion potentials when cracking occurred, which means the critical potential for EAC, was a negative function of the logarithm of the chloride concentration. The potentiostatic SSRT confirmed the linear relationship between the critical potential and logarithm of chloride concentration in the chloride concentration range from 4 x 10(-4) to 4 x 10(-2) kmol.m(-3). In comparison with the case of HCl addition, CaCl2 addition provided the same slope of the relation but higher critical potential. It was also found that the dissolved oxygen plays a role of increasing corrosion potential as an oxidant, and that the cracking occurs when the corrosion potential exceeds the critical value for EAC. It is concluded that the EAC initiation of this system is controlled by the mechanism of initiation of anodic localized corrosion by chloride ions.

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  • Environment-assisted cracking of Ti in methanol solutions containing HCl

    T Haruna, M Yamamoto, T Shibata

    JOURNAL OF THE JAPAN INSTITUTE OF METALS   63 ( 8 )   977 - 982   1999.8

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    Environment-assisted Cracking (EAC) of Ti in methanol solutions containing various concentrations of HCl has been investigated by using a slow strain rate testing apparatus with a dynamic observation system. In the EAC test, dissolved oxygen and water content were strictly controlled because it is known that these two factors influence the cracking of this system. It was observed that cracks initiated from black pits which were generated during the test, and that the cracking mode was intergranular and transgranular at the initial and the final stage of the crack propagation, respectively. Cracking occurred at 0.004 to 0.04 and 0.0004 to 0.04 kmol.m(-3) HCl for initial strain rates of 8.3 x 10(-7) and 2.5 x 10(-6) s(-1), respectively. This behavior was also influenced by electrode potential, that is, the cracking occurred above a critical potential depending on the concentration of HCl. The critical potential was expressed as a negative function of a logarithm of the concentration of HCl, and the potential was lowered as the initial strain rate increased. It was concluded that initiation of EAC for this system is mainly controlled by an anodic localized corrosion mechanism.

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  • Contribution of solution pH and buffer capacity to suppress intergranular stress corrosion cracking of sensitized type 304 stainless steel at 95 degrees C

    S Zhang, T Shibata, T Haruna

    CORROSION   55 ( 5 )   462 - 468   1999.5

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    The effects of solution pH and buffer capacity on intergranular stress corrosion cracking (IGSCC) of sensitized type 304 stainless steel ([SS] UNS S30400) was examined at 95 degrees C by slow strain rate technique (SSRT) with an in-situ cracking observation system, It was found that an increase in solution pH or buffer capacity increased crack initiation time and decreased mean crack initiation frequency, but exerted almost no effect on crack propagation. This inhibition effect on IGSCC initiation was explained as resulting from a retarding effect of solution pH and buffer capacity on the decrease in pH at crack nuclei caused by the hydrolysis of metal ions dissolved when the passive film was ruptured by strain in SSRT.

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  • Crack initiation and propagation of sensitized Type 304 stainless steel in the mixed solutions of sulfate and borate

    SH Zhang, T Shibata, T Haruna

    CORROSION SCIENCE   41 ( 5 )   853 - 867   1999.5

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    The stress corrosion cracking (SCC) of sensitized Type 304 stainless steel has been examined in Na2B4O7 + Na2SO4 solutions with a constant solution conductivity by using the slow strain rate test (SSRT). The cracking behavior was observed in-situ by a dynamic observation system with a charge-coupled device (CCD) camera. It was found that an increase in the k (= [Na2B4O7]/[Na2SO4]) value, or borate concentration, leads to a decrease in the SCC susceptibility by retarding crack initiation, namely, by delaying crack initiation time and reducing crack initiation frequency. By contrast, an increase in sulfate concentration enhances SCC susceptibility by shortening crack initiation time and accelerating crack initiation frequency. The critical sulfate concentration to accelerate crack initiation is 10(-5) kmol/m(3) and, below this concentration, the suppressing effect of borate ions on the SCC works. In addition, it is the solution conductivity, rather than the anion type or their concentrations, which control crack propagation. (C) 1999 Elsevier Science Ltd. All rights reserved.

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  • Inhibition effect of the borate ion on intergranular stress corrosion cracking of sensitized type 304 stainless steel

    S Zhang, T Shibata, T Haruna

    CORROSION   54 ( 6 )   428 - 434   1998.6

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    The intergranular stress corrosion cracking (IGSCC) behavior of sensitized type 304 (UNS S30400) stainless steel (SS) in dilute sodium borate (Na2B4O7) solutions at 95 degrees C was examined by slow strain rate testing (SSRT) using a dynamic observation system. The borate ion (B4O72-) suppressed IGSCC susceptibility of sensitized type 303 SS by delaying the crack initiation time and reducing the crack initiation frequency (CIF). The inhibition effect of the borate ion (B4O72-) on crack initiation may have resulted from its buffer effect on local acidification at crack nuclei and its inhibitive nature in reacting with metal ions to form a protective film. However, B4O72- concentration provided no remarkable inhibition effect on crack velocity (CV), which depended mainly upon solution conductivity, within the scattered values. Hydroxyl ions (OH-) also suppressed initiation of IGSCC, but not as effectively as B4O72-. The crack initiation time obeyed the exponential probability distribution, and the CV obeyed the Weibull probability distribution.

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  • Effect of strain rate on initiation and propagation of stress corrosion cracking for type 304L stainless steel Reviewed

    Takumi Haruna, Toshio Shibata

    Zairyo-to-Kankyo   Vol.47, No.4 pp.267-274 ( 4 )   267 - 274   1998.4

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  • Environment-induced degradation in strength for carbon steel in carbonate/bicarbonate solutions containing chloride ions

    Takumi Haruna, Liehong Zhu, Toshio Shibata

    Zairyo to Kankyo/ Corrosion Engineering   47 ( 12 )   771 - 776   1998

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    Electrochemical behavior and environment-induced degradation in strength for a carbon steel, SM400B, have been investigated in 0.025 M Na2CO3 + 0.075 M NaHCO3 solutions containing various concentrations of NaCl at 363 K. A slow strain rate test (SSRT) was employed to evaluate the degradation in mechanical properties. It was found from polarization curves that there generated pitting corrosion beyond 0.01 M NaCl. The SSRT was carried out applying a potential below the pitting potential to the specimen in the test solutions containing 0.5 and 0.01 M NaCl. Under both solution conditions, an increase in the applied potential resulted in a reduction in maximum stress and fracture strain, as well as an increase in current density during SSRT. From observation of the surface of the fracture specimens, however, there was no crack on it. Based on assumption of homogeneous deformation and general dissolution until maximum load, true stress at the maximum load was calculated. It was revealed that the true stress was almost independent of the applied potential, although the maximum load decreased with increase in the applied potential. It means that the homogeneous dissolution is accelerated by applying the stress and/or the dynamic strain. It is concluded from the facts that the degradation in the mechanical properties results from a rapid reduction in the cross section due to homogeneous dissolution, instead of localized corrosion.

    DOI: 10.3323/jcorr1991.47.771

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  • Initiation and propagation of IGSCC for sensitized type 304 stainless steel in dilute sulfate solutions

    S Zhang, T Shibata, T Haruna

    CORROSION SCIENCE   39 ( 9 )   1725 - 1739   1997.9

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    Initiation and propagation of IGSCC for sensitized Type 304 stainless steel in dilute sulfate solutions have been investigated by the slow strain rate test (SSRT) with a CCD camera system. An increase in concentration of sulfate ion was found to cause decrease in crack initiation strain and fracture strain, resulting in the increase in the IGSCC susceptibility. Statistical analysis made it clear that the increase in concentration of sulfate ion had little effect on crack initiation frequency, and crack initiation time obeyed the exponential probability distribution, but the crack velocity obeyed the Weibull probability distribution. With increase in the concentration of sulfate ion, the crack velocity increased, and the number of cracks decreased. On the contrary, the mean crack velocity decreased and the number of cracks increased with time. The dependence of the crack velocity on the concentration of sulfate ion and the number of active cracks under potentiostatic SSRT conditions was successfully explained by a multiple cracks model combined with the mass transport model. (C) 1997 Elsevier Science Ltd.

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  • Theoretical prediction of the scan rate dependencies of the fitting potential and the probability distribution in the induction time

    T Haruna, DD Macdonald

    JOURNAL OF THE ELECTROCHEMICAL SOCIETY   144 ( 5 )   1574 - 1581   1997.5

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    The point defect model (PDM) has been used to derive the dependence of the pitting potential on the voltage scan rate. Relationships derived from the PDR? predict that the observed pitting potential is a linear function of the square root of voltage scan rate at low scan rates, which agrees with experimental data reported in the literature. Furthermore, the critical concentration of condensed cation vacancies that give rise to passivity breakdown. as estimated from the sweep rate dependence of the pitting potential, is found to be in good agreement with that estimated from structural considerations. The PDM is also used to predict the probability distribution function in the induction time for pitting (t(ind)), that is, the survival probability, by assuming that the maximum diffusivity of the cation vacancy in a population of specimens is log-normally distributed. This calculated ''external'' distribution in the induction time is found to be in reasonable agreement with experimental induction time data for passivity breakdown on multiple specimens of single cn-stal (100) Ni and polycrystalline nickel buffered chloride solutions.

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  • Grain boundary sliding behavior during superplastic deformation in a Sn-Pb eutectic alloy

    N Furushiro, T Haruna, T Shibayanagi, U Umakoshi, S Hori

    SUPERPLASTICITY IN ADVANCED MATERIALS - ICSAM-97   243-2   109 - 113   1997

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    Although grain boundary sliding (GBS) mainly contributes to superplastic deformation, there are few studies on GBS behavior at each boundary in superplastic materials. It has been investigated the effect of three grain boundary characters of the angle between grain boundary at the specimen surface and the tensile direction, the kind of adjacent grains across a grain boundary, and Sigma value which was calculated from orientations of adjacent grains across a grain boundary on GBS in a superplastic Pb-Sn alloy.
    The superplastic behavior is found when GBS takes place at most of grain boundaries. It is considered that GBS is easier at a grain boundary both with the higher angle between grain boundary and tensile direction, and with the same kind of adjacent grains across a grain boundary. GBS is more difficult to occur at grain boundaries with rather low Sigma value than at random grain boundary. It is also shown that, for random grain boundary, GBS is easier to occur at a grain boundary with higher angle.

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  • Initiation and propagation of stress corrosion cracks for type 304L stainless steel in chloride solutions containing thiosulfate

    T. Haruna, T. Shibata, R. Toyota

    Corrosion Science   39 ( 10-11 )   1935 - 1947   1997

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    The stress corrosion cracking (SCC) of Type 304L stainless steel in chloride solutions containing various concentrations of thiosulfate ions (S2O3 2-) has been studied by using a slow strain rate testing apparatus with a dynamic observation system. It was observed that intergranular cracks were initiated from pits and propagated with the evolution of bubbles. The SCC was found to occur &gt
    10-3 M S2O3 2-, and the variation in the concentration of S2O3 2- from 10-3 to 10-1 M did not shown any marked difference in SCC susceptibility evaluated by maximum stress. According to the analysis of the cracking behavior from the observed images, crack propagation rate was found to increase slightly with increase in the concentration of S2O3 2-. The increase is considered to be caused by the change in the corrosion potential with the concentration. Apparent critical stress intensity factor for SCC was less scattered around 2-3 MNm-3/2 and slightly increased with increase in the concentration. The strain where either a pit or a crack was initiated first and the number of pits and cracks decreased remarkably and increased with increase in the concentration, respectively. S2O3 2- mainly affects the initiation process of the pit and the crack more than the crack propagation process. © 1997 Elsevier Science Ltd.

    DOI: 10.1016/S0010-938X(97)00087-5

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  • Initiation and propagation of stress corrosion cracks for type 304L stainless steel in chloride solutions containing thiosulfate

    T. Haruna, T. Shibata, R. Toyota

    Corrosion Science   39 ( 10-11 )   1935 - 1947   1997

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Elsevier Ltd  

    The stress corrosion cracking (SCC) of Type 304L stainless steel in chloride solutions containing various concentrations of thiosulfate ions (S2O3 2-) has been studied by using a slow strain rate testing apparatus with a dynamic observation system. It was observed that intergranular cracks were initiated from pits and propagated with the evolution of bubbles. The SCC was found to occur &gt
    10-3 M S2O3 2-, and the variation in the concentration of S2O3 2- from 10-3 to 10-1 M did not shown any marked difference in SCC susceptibility evaluated by maximum stress. According to the analysis of the cracking behavior from the observed images, crack propagation rate was found to increase slightly with increase in the concentration of S2O3 2-. The increase is considered to be caused by the change in the corrosion potential with the concentration. Apparent critical stress intensity factor for SCC was less scattered around 2-3 MNm-3/2 and slightly increased with increase in the concentration. The strain where either a pit or a crack was initiated first and the number of pits and cracks decreased remarkably and increased with increase in the concentration, respectively. S2O3 2- mainly affects the initiation process of the pit and the crack more than the crack propagation process. © 1997 Elsevier Science Ltd.

    DOI: 10.1016/S0010-938X(97)00087-5

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  • Effect of crystallization on the stochastic pit generation process of Fe-Cr-Si-B amorphous alloy

    T Shibata, Y Inohara, S Fujimoto, T Haruna

    MATERIALS TRANSACTIONS JIM   37 ( 12 )   1774 - 1780   1996.12

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    The effect of crystallization on the stochastic pit generation process of an Fe-Cr-Si-B amorphous alloy in a berate solution containing Cl- ions has been analyzed. Fitting potential of amorphous alloys showed a wide scatter and mean value shifts to the noble direction before crystallization starts, decreasing rapidly after crystallization, Stochastic analysis demonstrates that the initial increase in pitting potential is brought about by an increase in the pit repassivation rate, while the decrease in pitting potential after crystallization is caused by a rapid increase in the pit generation rate. Silicon oxide film formation during the heat treatment is concluded to be the main reason to increase the pitting potential and alpha-Fe micro-crystallites by crystallization in the latter stage of the heat treatment are responsible to decrease the pitting potential.

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  • The effect of potential on initiation and growth of intergranular stress corrosion cracking of sensitized 304 stainless steel in dilute sodium sulfate solutions at 368 K Reviewed

    Eiji Kikuchi, Toshio Shibata, Jiro Kuniya, Takumi Haruna

    Zairyo-to-Kankyo   Vol.44 No.6 pp.343-349 ( 6 )   343 - 349   1995.6

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    Language:Japanese   Publisher:Japan Society of Corrosion Engineering  

    The effects of potential and sodium sulfate concentration on the initiation and growth of IGSCC of sensitized 304 stainless steel in 0.01-1kmol/m<sup>3</sup> sodium sulfate solutions at 368K have been investigated. A slow strain rate test apparatus was used to make direct observations of crack generation and propagation during the test. The initiation and growth of IGSCC were found to occur for potentials from -500mV<sub>Ag/AgCl</sub> to -200mV<sub>Ag/AgCl</sub> and the IGSCC susceptibility reached a maximum at approximately from -400mV<sub>Ag/AgCl</sub> to -300mV<sub>Ag/AgCl</sub>. The initial crack generation time was a minimum around -400mV<sub>Ag/AgCl</sub> and the crack growth rate increased monotonously with increasing potential. Therefore, the SCC test results indicated that the maximum IGSCC susceptibility emerged at approximately from -400mV<sub>Ag/AgCl</sub> to -300mV<sub>Ag/AgCl</sub>, suggesting that the susceptibility of IGSCC must be determined as a function of the synergistic effect of the crack generation frequency and the crack growth rate. The initial crack generation time decreased with increasing sodium sulfate concentration. The crack growth rate was independent of the crack generation time and showed approximately a constant value. The crack generation time were distributed at random. Therefore, it was considered indispensable to evaluate IGSCC resistance of various austenitic stainless steel by statistical methods.

    DOI: 10.3323/jcorr1991.44.343

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  • Scanning Laser Enhanced Electrochemical Microscopy for Corrosion Research

    Toshio Shibata, Shinji Fujimoto, Tomoryo Shono, Shigeki Udaka, Takumi Haruna, Peter D. Green

    Mater. Sci. Forum   Vol.192-194 No.2 pp.733-740   1995.2

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  • ELECTROCHEMICAL EVALUATION FOR DEFECTS IN TIN FILMS COATED ON SUS-304 STAINLESS-STEEL

    T HARUNA, T SHIBATA

    ISIJ INTERNATIONAL   35 ( 5 )   519 - 523   1995

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:IRON STEEL INST JAPAN KEIDANREN KAIKAN  

    The amount of defects in TiN films coated on SUS 304 stainless steel has been evaluated by three electrochemical measuring techniques in a sulfuric acid solution containing potassium thiocyanate. Three different TiN films were prepared by a hollow cathode ion plating technique. A critical passivation current density (i(crit)) can readily provide the apparent amount of the defects. However, this method was found to overestimate the amount of the defects because active dissolution of the substrate at the measurement caused enlargement of the defects. An activation time, which is a period until free corrosion potential (E(corr)) descends to that of the bare substrate steel, was not useful to evaluate the amount of defects rapid ly because about a half the specimens did not activate within a test time of 90 ks. More precise and less destructive evaluation could be achieved by using a reciprocal of polarization resistance (R(p)(-1)) which was obtained by an electrochemical impedance spectroscopy immediately after activation. It is concluded that i(crit) is a suitable parameter for an approximate estimation of the defect area, and R(p)(-1) provides the more precise amount of the original defects.

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  • INITIATION AND GROWTH OF STRESS-CORROSION CRACKS IN TYPE 316L STAINLESS-STEEL DURING SLOW STRAIN-RATE TESTING

    T HARUNA, T SHIBATA

    CORROSION   50 ( 10 )   785 - 791   1994.10

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:NATL ASSN CORROSION ENG  

    The initiation and growth of cracks in type 316L (UNS S31603) stainless steel (SS) in a chloride solution containing thiosulfate ions (S2O32-) during slow strain rate testing (SSRT) were analyzed on the basis of fracture mechanics. Crack behavior on the specimen surface was observed in situ using a charge-coupled device (CCD) camera with a videotape recording system. Three types of specimens were used: a single-notched plate, a smooth cylinder, and a smooth plate. The single-notched specimen failed to produce a sharp crack similar to that formed on the smooth specimens. For the smooth specimens, the stress intensify factor (K-ISCC) was found to vary from 3.9 MN/m(3/2) to 5.0 MN/m(3/2), and the crack growth rate ranged from 5.2 x 10(-9) m/s to 1.0 x 10(-8) m/s, which approximately agreed with data determined by other authors using a fracture mechanics approach. Thus, the SSRT combined with the in situ observation technique was useful in analyzing the crack initiation and growth process.

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  • Anodic polarization behavior of Fe, Ni, Cr, Ni-Cr alloy and type 304 stainless steel in aqueous solutions containing fluoride ion

    Takumi Haruna, Toshio Shibata, Takahiro Oki

    Zairyo to Kankyo/ Corrosion Engineering   43 ( 6 )   331 - 335   1994

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    Polarization curves of Fe, Ni, Cr, Ni-18 mass% Cr alloy and Type 304 stainless steel were measured in aqueous fluoride solutions of various pH values from 1.9 to 11.7 at 303K. The concentration of fluoride ion was fixed at 0.2kmol·m-3 for all the solutions. Fe shows the very large current density of 101 to 102 A·m-2 beyond-500mVAg/AgCl at pH≤8.2 and beyond-100mV Ag/AgCl at pH 11.7. Ni shows the large current density beyond-200mV Ag/AgCl at pH≤3.2. However, two peaks appear in the curves at pH 5.8 and 8.2, and a passive region has the very small current density of 10-1 to 10-2 A·m-2 at pH 11.7. Cr does not show any active region but a passive region with the very small current density at any pH values. Ni-18 mass% Cr alloy shows that the current density increases with increasing potential at pH≤8.2, and that a passive region with very small current density appears at pH 11.7. Type 304 stainless steel behaves similarly as Cr such that they have very small current densities in the passive region at any pH values. No localized corrosion such as pit was found for all the materials. © 1994, Japan Society of Corrosion Engineering. All rights reserved.

    DOI: 10.3323/jcorr1991.43.331

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  • GENERATION AND PROPAGATION OF INTERGRANULAR STRESS-CORROSION CRACKS OF SENSITIZED SUS304 STAINLESS-STEEL IN NAF AQUEOUS-SOLUTION

    T SHIBATA, T HARUNA, T OKI

    TETSU TO HAGANE-JOURNAL OF THE IRON AND STEEL INSTITUTE OF JAPAN   79 ( 6 )   726 - 731   1993.6

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:IRON STEEL INST JAPAN KEIDANREN KAIKAN  

    The effects of temperature and applied potential on the intergranular stress corrosion cracking, IGSCC, susceptibility of sensitized SUS304 stainless steel in NaF aqueous solution have been investigated by using slow strain rate test, SSRT, based on the direct observation of crack generation and propagation during the test. It was found that the decrease in the maximum stress, which is usually used as a conventional SCC susceptibility index by SSRT, with increasing temperature was caused not only by the decrease in K'(ISCC), and crack generation time but also by the increase in crack growth rate and the number of cracks. The result of potential-controlled SSRT proved that the lowest maximum stress at 100 MV(Ag/AgCl) was induced by the decrease in K'(ISCC) and crack generation time. In conclusion, crack generation is more important compared with crack propagation for deciding the IGSCC susceptibility of sensitized SUS304 stainless steel in NaF solution.

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  • INITIATION AND GROWTH OF INTERGRANULAR STRESS-CORROSION CRACKS FOR SENSITIZED 304 STAINLESS-STEEL DEPENDING ON NAF CONCENTRATION OF AQUEOUS-SOLUTION

    T SHIBATA, T HARUNA, T OKI

    TETSU TO HAGANE-JOURNAL OF THE IRON AND STEEL INSTITUTE OF JAPAN   79 ( 6 )   721 - 725   1993.6

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:IRON STEEL INST JAPAN KEIDANREN KAIKAN  

    Using a slow strain rate technique, SSRT, with CCD camera system, initiation and growth behavior of intergranular stress corrosion cracking, IGSCC, for sensitized 304 stainless steel in aqueous solution containing various concentrations of NaF has been investigated. The largest decrease in maximum stress indicating the highest IGSCC susceptibility was found at 10(3) ppm NaF. And at the same concentration of 10(3) ppm NaF, the highest density of crack number and the shortest crack generation time was found. On the other hand, threshold stress intensity factor for IGSCC was independent of concentration of NaF. Crack growth rate showed a little dependence on NaF concentration, exhibiting a decrease at 10(3) ppm. It was obvious from the results that the highest IGSCC susceptibility at 10(3) ppm NaF was caused by increasing the number of cracks and decreasing the crack generation time, not by a change in threshold stress intensity factor for SCC or crack growth rate.

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  • ALTERNATIVE FOR EVALUATING SOUR GAS RESISTANCE OF LOW-ALLOY STEELS AND CORROSION-RESISTANT ALLOYS

    S TSUJIKAWA, A MIYASAKA, M UEDA, S ANDO, T SHIBATA, T HARUNA, M KATAHIRA, Y YAMANE, T AOKI, T YAMADA

    CORROSION   49 ( 5 )   409 - 419   1993.5

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:NATL ASSN CORROSION ENG  

    Thiosulfate ion was used as a substitute for hydrogen sulfide (H2S) to simulate stress corrosion cracking (SCC) of corrosion-resistant alloys (CRAs) and sulfide stress cracking (SSC) of high-strength, low-alloy steels. Several SCC tests using a variety of stress application techniques showed the brine containing thiosulfate exhibited similar severity to brine containing H2S in regard to SCC when plastic strain was applied to the CRAs. Materials that exhibited SCC susceptibility in brine containing thiosulfate agreed well the SCC susceptibility of those in brine containing H2S. Types 304 (UNS S30400) and 316L (UNS S31603) stainless steels and duplex stainless steel exhibited in both environments. However, high-nickel austenitic alloys such as alloys 904L (UNS N08904) and 825 (UNS N08825) did not. A 10(-3) to 10(-2) mol/l S2O32- addition in 20% NaCl aqueous solution at 353 K corresponded to H2S of 0.1 to 1 MPa at 473 K. The SSC susceptibilities of high-strength, low-alloy steels in a 10(-3) mol/l S2O32- + 5% NaCl + 0.5% acetic acid solutions were close to those in NACE Standard TM0284-86 solution (substitute ocean water saturated with 0.1 MPa H2S). Results suggested the possibility of using thiosulfate ion as an alternative to H2S.

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  • Stress corrosion cracking susceptibility of sensitized type 304 stainless steel in NaF solution evaluated by SSRT

    Toshio Shibata, Takahiro Oki, Takumi Haruna

    Corrosion Engineering   Vol.42 No.1, pp.15-19   1993.1

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  • In Situ Observation of Stress Corrosion Crack During Slow Strain Rate Test and Estimation of the Crack Behavior by Fracture Mechanics and Statistics

    Toshio Shibata, Takumi Haruna

    Corrosion Engineering pp.977-987   Vol.41 No.12, pp.809-815   1992.12

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  • EFFECT OF GRAIN-BOUNDARY CHARACTERS ON GRAIN-BOUNDARY SLIDING DURING SUPERPLASTIC DEFORMATION

    T HARUNA, T SHIBAYANAGI, S HORI, N FURUSHIRO

    MATERIALS TRANSACTIONS JIM   33 ( 4 )   374 - 379   1992.4

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    It is well known that grain boundary sliding (GBS) mainly contributes to superplastic deformation. However, since there are few studies on GBS behavior at each grain boundary during superplastic deformation by using polycrystal material, the contribution of three grain boundary characters to GBS at each grain boundary during superplastic deformation has been investigated. Three characters were adopted as the following; the angle between grain boundary at the specimen surface and tensile direction, the kind of adjacent grains across a grain boundary, and SIGMA-value which was calculated from orientations of adjacent grains across a grain boundary. The examination was carried out by tensile test in SEM with Pb-Sn eutectic alloy at room temperature. The results obtained are summarized as follows: (1) The superplastic behavior was confirmed to occur when GBS was observed at most of grain boundaries. (2) It is considered that GBS is easier at a grain boundary both with the higher angle between grain boundary and tensile direction, and with the same kind of adjacent grains across a grain boundary. (3) So far as Pb-Pb boundary is concerned, GBS was more difficult to occur at grain boundary with rather low SIGMA-value than at random grain boundary. Moreover, for random grain boundary, GBS was easier to occur at a grain boundary with higher angle of grain boundary.

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  • Electrochemical Conditions for the Occurrence of SCC in Type 316L Stainless Steel in Chloride Solutions Contaning Thiosulfate Ions Reviewed

    Toshio Shibata, Takumi Haruna

    Corrosion Engineering   Vol.41, No.4, pp.217-223   1992.4

  • SUSCEPTIBLE POTENTIAL REGION FOR STRESS-CORROSION CRACKING OF SUS316L STAINLESS-STEEL IN CHLORIDE SOLUTION CONTAINING THIOSULFATE ION

    T SHIBATA, T HARUNA

    TETSU TO HAGANE-JOURNAL OF THE IRON AND STEEL INSTITUTE OF JAPAN   78 ( 2 )   312 - 318   1992.2

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:IRON STEEL INST JAPAN KEIDANREN KAIKAN  

    Susceptible potential region for stress corrosion cracking, SCC, of SUS316L stainless steel has been investigated in 20 mass % NaCl aqueous solution containing 10(-2) kmol.m-3 thiosulfate ion by using a slow strain rate technique, SSRT. Potential from -400 to -340 mV(Ag/AgCl) was controlled either chemically by changing the concentration of dissolved oxygen, DO, in the solution or electrochemically by using a potentiostat. In both cases, cracks always generated at pits. In case of controlling DO, free corrosion potential raised and a shape of pit and crack changed with increase in the concentration of DO. Strain at the maximum stress, e(SCC), was, however, independent of the concentration of DO, and depended on the number of cracks in the fracture surface. In case of applying potential, localized corrosion was found to generate beyond a critical potential of -370 mV(Ag/AgCl); cracks were observed from -370 to -340 mV(Ag/AgCl) and pit size increased with increase in applied potential. e(SCC) was found not to be sensitive to the applied potential, but to be mainly decided by the strain at which pit generated. The crack growth rate which was estimated by the analysis of the stress-strain curves was found to be almost constant in the potential range between -370 and -340 mV(Ag/AgCl).

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  • STRESS-CORROSION CRACKING OF SUS316L STAINLESS-STEEL IN THE CHLORIDE SOLUTION CONTAINING THIOSULFATE ION BY THE SLOW STRAIN RATE TECHNIQUE

    T SHIBATA, T HARUNA, S FUJIMOTO, S NAKANE

    TETSU TO HAGANE-JOURNAL OF THE IRON AND STEEL INSTITUTE OF JAPAN   77 ( 9 )   1511 - 1518   1991.9

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:IRON STEEL INST JAPAN KEIDANREN KAIKAN  

    Stress corrosion cracking (SCC) behavior of SUS316L stainless steel in the chloride solution containing thiosulfate has been investigated by using a slow strain rate technique (SSRT). The susceptibility of SCC was found to depend on the strain rate, the concentration of thiosulfate and chloride, and pH. The highest susceptibility was obtained at the condition of 20 mass%NaCl containing 10(-2) kmol.m-3 Na2S2O3 at pH 5.3 and 2.2 X 10(-7) s-1. Observations of fractured specimens showed that cracks perpendicular to the tensile axis generated at the pits. The initial fracture mode of the crack was intergranular, followed by transgranular and dimple with propagation of the crack. Intergranular fracture initiated from intergranular corrosion on the bottom of the pit, in which pH decreased less than 2. Immediately after immersion, pits generated easily because the dissolved oxygen with thiosulfate rapidly raise free corrosion potential upto pitting potential in cooperation with the action of thiosulfate to lower the pitting potential. Decrease in pH caused lowering of pitting potential and increase of the number of cracks, while the highest SCC susceptibility was obtained at pH 5.3. At conditions showing the high SCC susceptibility, corrosion potential was always in the range between -400 and -370 mV (Ag/AgCl). Therefore, the SCC behavior in this system is strongly controlled by the electrochemical factors.

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  • Detection of Welded Areas of Type 304 Stainless Steel Using the Vibrating Electrode Scanning Technique Reviewed

    Toshio Shibata, Takumi Haruna, Shinji Fujimoto

    Corrosion Engineering   Vol.39 No.6, pp.303-308   1990.6

  • Detection of welded part of type 304 stainless steel with the scanning vibrating electrode technique Reviewed

    Toshio Shibata, Takumi Haruna, Shinji Fujimoto

    Boshoku gijutsu   39 ( 6 )   303 - 308   1990

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

    Localized corrosion behavior of welds of type 304 stainless steel was investigated by using a scanning vibrating electrode technique in H2SO4 aqueous solutions containing various concentrations of KSCN at 298 K. The distribution of corrosion current density was measured during an electrochemical potentiokinetic reactivation test in 0.5 mol/l H2SO4 solution containing 10-2 mol/l KSCN. The weld metal, heat affected zone, and base metal can be distinguished for differences in the current density at the transition potential from passive to active region. The distributions of current density were measured during immersion in 0.5 mol/l H2SO4 solutions containing various concentrations of KSCN. The weld metal shows anodic peak current density at 10-4 mol/l KSCN, whereas it shows a cathodic peak current density at 100 mol/l KSCN.

    DOI: 10.3323/jcorr1974.39.6_303

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  • 第3章腐食に関する基礎知識 Reviewed

    春名 匠(分担)

    溶接部の腐食トラブル事例と要因解析・対策の基礎,溶接学会・腐食防食学会  2019.4 

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  • 第2節 金属材料の水素脆化による損傷とその評価

    春名 匠(分担)( Role: Sole author)

    水素の製造、輸送・貯蔵技術と材料開発事例集,技術情報協会  2019.4 

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  • 歯科材料開発に向けたチタンおよびチタン合金の腐食解析 Reviewed

    春名 匠( Role: Sole author)

    電気化学  2018.9 

  • Ti基金属間化合物の環境脆化に対する電気化学的解釈 Reviewed

    春名 匠( Role: Sole author)

    チタン  2018.7 

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  • 金属材料に形成する不働態皮膜の成長・破壊理論 Reviewed

    春名 匠( Role: Sole author)

    日本接着学会誌  2018.7 

  • II. Fundamental Electrochemical Method for Corrosion: Corrosion Potential Reviewed

    T. Haruna( Role: Sole author)

    Corros. Eng.  2018.6 

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  • 添加元素の異なる鋼材への水素侵入

    春名 匠( Role: Sole author)

    日本材料学会 腐食防部門委員会 第322 回例会資料  2018.5 

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  • 第Ⅰ編 異材溶接および肉盛溶接の基礎 第3章 異材溶接および肉盛溶接部の腐食特性

    春名 匠( Role: Edit)

    異材・肉盛溶接ガイドブック  2018.5 

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  • 第Ⅰ編 異材溶接および肉盛溶接の基礎第3章 異材溶接および肉盛溶接部の腐食特性 Reviewed

    春名 匠(分担)( Role: Contributor)

    異材・肉盛溶接ガイドブック  2018.5 

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  • 腐食電気化学測定法講座 Ⅱ腐食の電気化学測定法の基礎 1. 腐食電位

    春名 匠( Role: Sole author)

    材料と環境  2018.1 

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  • 腐食電気化学測定法講座Ⅱ腐食の電気化学測定法の基礎1. 腐食電位 Reviewed

    春名 匠( Role: Sole author)

    材料と環境  2018.1 

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  • 金属材料の水素脆化評価技術 Reviewed

    春名 匠( Role: Sole author)

    日本海水学会誌  2017.2 

  • 金属表面における腐食反応挙動の可視化 Reviewed

    廣畑洋平, 寺岡愛莉, 富田翔子, 西田健太朗, 春名 匠( Role: Joint author)

    理工学と技術  2016.11 

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  • 先端アルミニウム材料創製のための電気化学からのアプローチ Reviewed

    世利修美, 小野幸子, 阿相英孝, 西本明生, 春名 匠( Role: Joint author)

    軽金属  2015.9 

  • 腐食・表面改質・切削・接合 Reviewed

    春名 匠, 小椋 智( Role: Joint author)

    軽金属  2015.8 

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  • 理工系のための現代基礎化学 Reviewed

    春名 匠( Role: Sole author)

    三共出版  2015.3  ( ISBN:9784782707210

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  • Development of Ti Alloys for Dental Devices with Corrosion Resistance to Fluoride Solutions Reviewed

    T. Haruna( Role: Sole author)

    Corros. Eng.  2014.12 

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  • 生体用Ti-6Al-4Vの環境脆化と電気化学的特性 Reviewed

    春名 匠( Role: Contributor)

    バイオマテリアル研究の最前線  2014.10  ( ISBN:9784889030761

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  • Development and Advancement of Hydrogen Detection Techniques Employed in Research on Hydrogen Embrittlement Reviewed

    Takumi Haruna( Role: Sole author)

    Corros. Eng.  2014.8 

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  • フッ化物水溶液に耐食性を示す歯科部材用Ti合金 Reviewed

    春名 匠( Role: Sole author)

    材料と環境  2014.5 

  • 水素脆化研究における水素検出・計測技術の展開 Reviewed

    春名 匠( Role: Sole author)

    材料と環境  2014.3 

  • アルミニウムの腐食・防食(その7)アルミニウム合金の応力腐食割れとその対策 Reviewed

    春名 匠( Role: Sole author)

    防錆管理  2013.11 

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  • 第7章 腐食、はんだ、塗膜のインピーダンス測定 第1節 金属材料における腐食の電気化学測定法と解析事例 Reviewed

    春名 匠( Role: Contributor)

    電気化学/インピーダンス測定のノウハウと正しいデータ解釈,技術情報協会  2013.5  ( ISBN:9784861044823

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  • 気相法を利用したTi-Mg合金およびTi-Ca合金の開発とフッ化物水溶液中での耐食性 Reviewed

    春名 匠( Role: Sole author)

    チタン  2013.4 

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  • JST-WEBラーニング「技術者のための腐食診断と防食技術コース」 Reviewed

    春名 匠(分担)( Role: Sole author)

    (独)科学技術振興機構  2011.4 

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  • レアメタル便覧 Reviewed

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    丸善  2011.1  ( ISBN:9784621082768

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    春名 匠( Role: Sole author)

    材料と環境  2009.5 

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  • 214th Meeting of The Electrochemical Societyに参加して Reviewed

    春名 匠( Role: Sole author)

    材料と環境  2009.3 

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  • 電気化学測定/解析テクニック&事例集 Reviewed

    春名 匠( Role: Contributor)

    情報機構  2009.2  ( ISBN:9784904080207

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  • How does corrosion behavior change with different solutes? Reviewed

    T. Haruna( Role: Sole author)

    Corros. Eng.  2006.12 

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  • What is the Method which Quantify the Content of Hydrogen in Steels? Reviewed

    T. Haruna( Role: Sole author)

    Corros. Eng.  2006.12 

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  • Are there any methods quantifing hydrogen in steels? Reviewed

    Takumi Haruna( Role: Sole author)

    Zairyo-to-Kankyo  2006.9 

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  • How does corrosion change with a kind of solute in the solution? Reviewed

    Takumi Haruna( Role: Sole author)

    Zairyo-to-Kankyo  2006.7 

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  • Effect of environmental factors on environment-assisted cracking of titanium alloys Reviewed

    Takumi Haruna( Role: Sole author)

    Seisan-to-Gijutsu  2004.7 

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  • In-situ observation technique in high temperature water Reviewed

    Takumi Haruna( Role: Contributor)

    Achievement and future of optimization of water chemistry in nuclear power plant  2003.8 

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  • Stress corrosion cracking

    HARUNA Takumi( Role: Sole author)

    Bull. Osaka Yakin-kai  2001.3 

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  • Factors inhibiting initiation of stress corrosion cracking of sensitized stainless steels

    Takumi Haruna, Toshio Shibata( Role: Joint author)

    Bull. ANERI  1999.12 

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  • Contribution of environmental factors to stress corrosion cracking of stainless steels Reviewed

    HARUNA Takumi( Role: Contributor)

    Q&A 1000 for engineering of joining and welding  1999.8  ( ISBN:9784915957345

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  • Breakdown of passive films on metals - Explanation based on point defect model - Reviewed

    Takumi Haruna, Digby. D. Macdonald( Role: Joint author)

    Zairyo-to-Kankyo  1998.2 

  • Advance in slow strain rate technique (SSRT) for evaluating susceptibility of stress corrosion cracking Reviewed

    Takumi Haruna, Toshio Shibata( Role: Joint author)

    Materia  1997.4 

  • Corrosion of stainless steels by fluoride Reviewed

    Takumi Haruna, Toshio Shibata( Role: Joint author)

    Maintenance  1997.2 

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MISC

  • PriME2012

    HARUNA Takumi

    62 ( 3 )   93 - 94   2013.3

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    CiNii Books

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  • EUROCORR 2010

    HARUNA Takumi

    60 ( 4 )   168 - 169   2011.4

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  • Research Supporting Division, Sumitomo Metal Technology, Inc.

    HARUNA Takumi

    59 ( 11 )   416 - 417   2010.11

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  • To Be a Corrosionist from a Young Person with Recent Manner

    HARUNA Takumi

    59 ( 7 )   243 - 244   2010.7

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    CiNii Books

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  • EUROCORR 2009

    HARUNA Takumi

    59 ( 1 )   6 - 7   2010.1

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  • 1A族金属または2A族金属-チタン Reviewed

    春名 匠, 大石敏雄, 山下直司, 元家大介

    特開2008-81751   2008.4

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  • チタン-ニッケル合金及びチタン-ニッケル合金を有する歯科医療用部材 Reviewed

    春名 匠

    特願2008-77683   2008.3

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  • What is the method which quantify the content of hydrogen in steels?

    HARUNA Takumi

    55 ( 9 )   391 - 392   2006.9

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  • 1A族金属または2A族金属-チタン Reviewed

    春名 匠, 大石敏雄, 山下直司, 元家大介

    特願2006-234166   2006.8

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  • How does corrosion behavior change with difference in a kind of solute?

    HARUNA Takumi

    55 ( 7 )   294 - 295   2006.7

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  • Influences of Potential and pH on Dissolution of Rapidly-Strained Ti-6Al-4V in a Simulated Biological Environment

    HAMASAKI Masaya

    15 ( 6 )   1302 - 1302   2002.9

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  • Design Engineering Lab., Department of Mechanical Engineering, Faculty of Engineering, Himeji Institute of Technology

    HARUNA Takumi

    51 ( 3 )   97 - 98   2002.3

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  • Breakdown of Passive Films on Metals -Explanation Based on Point Defect Model-

    HARUNA Takumi, MACDONALD Digby D.

    Corrosion engineering   47 ( 2 )   78 - 85   1998.2

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Presentations

  • 濃度の異なる炭酸塩緩衝水溶液環境下におけるマグネシウムの腐食挙動

    十河豪大, 春名 匠

    2022.11 

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    Venue:東京工大  

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  • 大気腐食中におけるアルミニウムの孔食発生時間に及ぼす液量の関係

    山口凌太, 春名 匠

    2022.11 

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    Venue:東京工大  

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  • NaCl水溶液中におけるSUS304鋼の腐食挙動に及ぼす疑似バイオフィルムの影響

    上畑絵麻, 春名 匠

    2022.10 

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    Venue:久留米シティプラザ  

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  • 走査型青色レーザー電解顕微鏡によって可視化されたFe中の透過水素経路

    野川心路, 春名 匠

    2022.10 

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    Venue:久留米シティプラザ  

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  • 隙間噴流試験中の銅合金の電気化学反応

    安田吉伸, 水谷直弘, 松林良蔵, 丸山 徹, 春名 匠

    2022.9 

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    Venue:広島大学  

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  • チオ硫酸ナトリウムを含有する寒天膜を付着させたSUS304鋼の腐食挙動に及ぼす浸漬時間の影響

    上畑絵麻, 春名 匠

    2022.9 

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    Venue:福岡工大  

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  • 電気化学的に形成させたTi不働態皮膜の耐食性に及ぼす皮膜変質処理の影響

    西尾翔太, 春名 匠

    2022.9 

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    Venue:福岡工大  

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  • 臭化リチウム水溶液中での銅の腐食挙動に及ぼす臭化物イオン濃度の影響

    佐藤悠然, 春名 匠

    2022.9 

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    Venue:福岡工大  

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  • 高強度鋼への侵入水素濃度に及ぼす電位およびpHの影響

    木村友紀, 春名 匠

    2022.9 

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    Venue:福岡工大  

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  • 硫酸塩水溶液中における鉄の水素濃度に及ぼす電位とpHの影響

    春名 匠, 望月 哲

    2022.9 

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    Venue:福岡工大  

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  • FeCl3でさび層を形成させた鉄の大気腐食速度に及ぼす相対湿度の影響

    岡田和也, 春名 匠

    2022.9 

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    Venue:福岡工大  

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  • 乾湿を繰り返し与えた純鉄中への水素侵入挙動に及ぼす湿度の影響

    酒井成生, 甲斐 樹, 春名 匠

    2022.9 

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    Venue:福岡工大  

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  • 45 mass%LiBr水溶液に浸漬した銅の腐食減少量に及ぼすLi2MoO4の影響

    嵯峨山 葵, 入江智芳, 春名 匠

    2022.9 

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    Venue:福岡工大  

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  • Relationship between initiation time of pitting corrosion for aluminum and chloride concentration during atmospheric corrosion

    R. Yamaguchi, T. Haruna, Y. Hirohata

    2022.9 

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    Venue:Toyama, Japan  

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  • 皮膜変質処理がTi 不働態皮膜の耐食性に及ぼす影響

    西尾翔太, 春名 匠

    2022.5 

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    Venue:WEB  

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  • 大気腐食中におけるAl の孔食発生時間とCl-濃度の関係

    山口凌太, 春名 匠, 廣畑洋平

    2022.5 

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    Venue:WEB  

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  • 相対湿度を制御した大気中におけるNaCl 含有さび層付き鉄の腐食速度

    岡田和也, 春名 匠

    2022.5 

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    Venue:WEB  

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  • 濃度を変化させたホウ酸塩緩衝水溶液中におけるMg の腐食挙動

    十河豪大, 春名 匠

    2022.5 

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    Venue:WEB  

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  • 走査型青色レーザー電解顕微鏡を用いたFeの組織と透過水素の表面分布の関連性

    野川心路, 春名 匠

    2022.3 

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    Venue:WEB  

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  • 塩化ナトリウムもしくはチオ硫酸ナトリウムを含む寒天膜を接触させたSUS304ステンレス鋼の腐食挙動

    西尾翔太, 春名 匠, 上畑絵麻

    2022.3 

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    Venue:WEB  

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  • 鉄鋼材料への水素侵入に及ぼす環境因子および材料因子の影響

    春名 匠

    2022.3 

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    Venue:WEB  

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  • 銅合金鋳物の耐エロージョン・コロージョン性に対する電気化学的解析手法の開発

    安田吉伸, 水谷直弘, 松林良蔵, 丸山 徹, 春名 匠

    2021.12 

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    Venue:WEB  

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  • 大気腐食中におけるアルミニウムの孔食発生時間に及ぼすCl-濃度の影響

    山口凌太, 春名 匠

    2021.11 

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    Venue:WEB  

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  • pHの異なるホウ酸塩緩衝水溶液環境下におけるマグネシウムの腐食挙動

    十河豪大, 春名 匠

    2021.11 

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    Venue:WEB  

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  • 走査型青色レーザー電解顕微鏡を用いたFe 表面での透過水素分布

    野川心路, 春名 匠

    2021.10 

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    Venue:WEB  

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  • 高温濃厚LiBr 水溶液中に浸漬した炭素鋼-銅対のガルバニック腐食に及ぼすLiOH 濃度の影響

    北村亮裕, 入江智芳, 八鍬 浩, 春名 匠

    2021.10 

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    Venue:WEB  

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  • 大気腐食における純鉄への水素侵入に及ぼす乾湿繰り返し数と湿度の影響

    甲斐 樹, 春名 匠

    2021.10 

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    Venue:WEB  

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  • 隙間噴流試験中の銅合金に作用する腐食反応

    安田吉伸, 水谷直弘, 松林良蔵, 丸山 徹, 春名 匠

    2021.9 

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    Venue:WEB  

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  • NaClおよびNa2S2O3を含む擬似バイオフィルムがSUS304鋼の腐食挙動に及ぼす影響

    西尾翔太, 春名 匠

    2021.9 

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    Venue:WEB  

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  • 高温窒素固溶処理を行ったマルテンサイト系ステンレス鋼に生成する不働態皮膜の安定性に及ぼす pHの影響

    金森円花, 春名 匠, 土井研児, 岩佐康弘, 寺内俊太郎

    2021.9 

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    Venue:WEB  

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  • さび層を形成させた鉄の大気腐食速度に及ぼす相対湿度および液膜厚さの影響

    岡田和也, 春名 匠

    2021.9 

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    Venue:WEB  

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  • さび層を形成した純鉄への水素侵入に及ぼす乾湿繰り返し数の影響

    甲斐 樹, 汪 洋, 春名 匠

    2021.5 

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    Venue:WEB  

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  • 高温濃厚LiBr 水溶液中における銅の分極挙動に及ぼす浸漬時間の影響

    北村亮裕, 入江智芳, 八鍬 浩, 廣畑洋平, 春名 匠

    2020.10 

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    Venue:WEB  

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  • Fe に対する水素侵入の電位依存性に及ぼすpH の影響

    望月 哲, 春名 匠

    2020.10 

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    Venue:WEB  

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  • 一定湿度/乾燥の繰り返し中における各種鋼材の大気腐食速度

    春名 匠, 中井美紗季, 廣畑洋平

    2020.9 

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    Venue:WEB  

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  • 鋼材表面に生成した腐食生成物の機械学習を用いた放射光μXRD 解析

    小澤敬祐, 森 拓弥, 吉村真史, 高山裕貴, 横山和司, 春名 匠

    2020.5 

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    Venue:日本科学未来館(中止:開催とする  

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  • 鉄に形成させた炭酸鉄皮膜中における水の拡散係数の推定

    甲斐 樹, 中西優貴, 谷口直樹, 土橋竜太, 廣畑洋平, 春名 匠

    2020.5 

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    Venue:日本科学未来館(中止:開催とする  

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  • 水素の拡散経路を検出するための走査型青色レーザー電解顕微鏡の開発

    春名 匠, 石田広志, 門脇梨沙, 廣畑洋平

    2020.5 

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    Venue:日本科学未来館(中止:開催とする  

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  • Feへの水素侵入挙動に及ぼすpHおよび塩化物イオンの影響

    望月 哲, 廣畑洋平, 春名 匠

    2020.5 

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    Venue:日本科学未来館(中止:開催とする  

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  • 走査型レーザ電解顕微鏡を用いた純鉄における局在化水素の検出

    石田広志, 門脇梨沙, 廣畑洋平, 春名 匠

    2020.3 

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    Venue:東京工業大学(中止:開催とする)  

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  • 塩化物イオン含有水溶液中における Feへの水素侵入挙動に及ぼすpHの影響

    望月 哲, 原田佑香, 廣畑洋平, 春名 匠

    2020.3 

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    Venue:東京工業大学(中止:開催とする)  

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  • Estimation for diffusion coefficient of D2O in some Fe oxide films produced by high-temperature

    T. Haruna, T. Yamamoto, Y. Miyairi, T. Shibata, N. Taniguchi, K. Sakamaki, H. Tachikawa, R. Dobashi

    2019.11 

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    Venue:Nancy, France  

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  • Transient in local pH on Al surface during atmospheric corrosion using a system measuring pH distribution

    S. Mochizuki, Y. Hirohata, T. Haruna

    2019.11 

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    Venue:Yokohama, Japan, PACIFICO YOKOHAMA  

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  • Effect of humidity on rate of hydrogen permeation for iron covered with the rust produced by dry-wet cycling

    Y. Wang,, Y. Hirohata, T. Haruna

    2019.11 

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    Venue:Yokohama, Japan, PACIFICO YOKOHAMA  

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  • Corrosion behavior of AZ61 Mg alloy in carbonate and borate buffer solutions

    S. Fujikawa, Y. Hirohata, T. Haruna

    2019.11 

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    Venue:Yokohama, Japan, PACIFICO YOKOHAMA  

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  • Mg合金の炭酸塩およびホウ酸塩緩衝水溶液における分極挙動

    藤川翔平, 廣畑洋平, 春名 匠

    2019.11 

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    Venue:東京農工大学 小金井キャンパス  

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  • PWCC合同研究委員会の主題(2)—異材溶接部の耐食性

    春名 匠

    2019.10 

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    Venue:札幌市教育文化会館  

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  • 湿潤環境下におけるMgCl2を含有するさび層を形成した純鉄の水素侵入挙動

    汪 洋, 廣畑洋平, 春名 匠

    2019.10 

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    Venue:札幌市教育文化会館  

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  • 硫酸イオン含有水溶液中におけるFeへの水素侵入挙動に及ぼすpHの影響

    望月 哲, 廣畑洋平, 春名 匠

    2019.10 

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    Venue:札幌市教育文化会館  

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  • 炭酸塩緩衝水溶液におけるMg合金の腐食挙動に及ぼすAl量の影響

    藤川翔平, 廣畑洋平, 春名 匠

    2019.10 

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    Venue:札幌市教育文化会館  

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  • 放射光分析を用いた鋼材表面の腐食挙動解析

    小澤敬祐, 山本慎太郎, 森 拓弥, 横溝臣智, 李 雷, 横山和司, 春名 匠

    2019.10 

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    Venue:札幌市教育文化会館  

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  • 濃厚臭化リチウム水溶液中における銅の腐食挙動に対する環境因子の影響

    入江智芳, 八鍬 浩, 尾田拓哉, 廣畑洋平, 春名 匠

    2019.10 

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    Venue:関西大学  

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  • 塩化物水溶液中におけるCu合金の腐食に及ぼすCuイオンの影響

    安田吉伸, 松林良蔵, 丸山 徹, 春名 匠

    2019.10 

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    Venue:関西大学  

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  • Application of GD-OES to determine location of water in electrochemically-modified anodic aluminum-oxide films

    T. Haruna, M. Miyazaki, Y. Hirohata

    2019.9 

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    Venue:Dresden, Germany  

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  • Al含有量の異なるMg合金における炭酸塩緩衝水溶液中の腐食挙動

    藤川翔平, 廣畑洋平, 春名 匠

    2019.9 

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    Venue:岡山大学津島キャンパス  

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  • さび層を形成した純鉄への水素侵入に及ぼすMgCl2付着量の影響

    汪 洋, 廣畑洋平, 春名 匠

    2019.9 

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    Venue:岡山大学津島キャンパス  

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  • pH分布測定システムを用いた大気腐食環境におけるAl表面の孔食発生時間の検出

    望月 哲, 廣畑洋平, 春名 匠

    2019.9 

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    Venue:岡山大学津島キャンパス  

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  • Hydrogen absorption into iron with rust layer during atmospheric corrosion in humidity-controlled air

    T. Haruna, Y. Shoji, Y. Hirohata

    2019.9 

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    Venue:Seville, Spain  

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  • Correlation between susceptibility to environment-assisted cracking of super-elastic TiNi alloy and the states and their amount of hydrogen in it

    T. Haruna, D. Morihashi, Y. Hirohata

    2019.6 

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    Venue:Nantes, France  

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  • Effect of passivation time on component of the film on Ti passivated in sulfuric acid solution at 323 K

    T. Haruna, Y. Fujimoto, M. Imamura, Y. Hirohata

    2019.6 

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    Venue:Hyogo, Japan  

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  • AZ61 Mg合金のホウ酸塩緩衝水溶液におけるアノード分極挙動

    藤川翔平, 廣畑洋平, 春名 匠

    2019.5 

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    Venue:大宮ソニックシティ  

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  • MgCl2含有量の異なる安定さび層付き純鉄への湿潤環境下における水素侵入挙動

    汪 洋, 廣畑洋平, 春名 匠

    2019.5 

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    Venue:大宮ソニックシティ  

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  • 大気腐食環境におけるAl表面のpH変化のin-situ測定

    望月 哲, 廣畑洋平, 春名 匠

    MMAD研究会  2019.3 

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    Venue:関西大学  

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  • 乾湿繰り返しにより安定さび層を形成した純鉄への湿潤環境下における水素侵入挙動

    汪 洋, 廣畑洋平, 春名 匠

    MMAD研究会  2019.3 

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    Venue:関西大学  

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  • 多数回乾湿繰り返しを行って形成したさび層をもつ純鉄の湿潤環境下における水素透過

    汪 洋, 山西 潤, 廣畑洋平, 春名 匠

    日本鉄鋼協会2019年度春季講演大会概要集  2019.3 

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    Venue:東京電機大学  

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  • ホウ酸塩緩衝水溶液におけるAZ61 Mg合金の皮膜形成に及ぼす電位の影響

    藤川翔平, 廣畑洋平, 春名 匠

    日本金属学会2019年度春期講演大会概要集  2019.3 

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    Venue:東京電機大学  

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  • pH分布測定システムを用いた大気腐食環境におけるAl表面のpH変化

    望月 哲, 西田健太朗, 廣畑洋平, 春名 匠

    日本金属学会2019年度春期講演大会概要集  2019.3 

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    Venue:東京電機大学  

    poster 優秀ポスター賞

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  • AZ61 Mg合金の腐食挙動に及ぼす炭酸イオンとホウ酸イオンの影響

    藤川翔平, 廣畑洋平, 春名 匠

    軽金属学会関西支部「若手研究者・院生による研究発表会」  2019.1 

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    Venue:大阪大学  

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  • 大気腐食環境下におけるAlへのpH分布測定システムの適用

    望月 哲, 廣畑洋平, 春名 匠

    軽金属学会関西支部「若手研究者・院生による研究発表会」  2019.1 

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    Venue:大阪大学  

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  • Alの大気腐食発生に及ぼす液膜内Cl-濃度と表面電位の関係

    西田健太朗, 廣畑洋平, 春名 匠

    軽金属学会関西支部「若手研究者・院生による研究発表会」  2019.1 

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    Venue:大阪大学  

    poster ベストポスター賞

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  • アルミニウムの大気腐食発生と液膜内Cl-濃度の関係

    西田健太朗, 廣畑洋平, 春名 匠

    軽金属学会第135回秋期講演大会概要集  2018.11 

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    Venue:芝浦工業大学  

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  • pH分布測定システムを用いた大気腐食中のアルミニウム表面の変化

    廣畑洋平, 望月 哲, 藤川翔平, 西田健太朗, 春名 匠

    軽金属学会第135回秋期講演大会概要集  2018.11 

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    Venue:芝浦工業大学  

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  • 大気腐食環境下におけるアルミニウムのpH分布測定

    廣畑洋平, 望月 哲, 藤川翔平, 西田健太朗, 春名 匠

    腐食防食学会 第65回材料と環境討論会  2018.10 

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    Venue:富山  

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  • 種々の濃度のMgCl2含有液滴の濃縮と304鋼の孔食発生との関係

    汪 洋, 西田健太朗, 廣畑洋平, 春名 匠

    腐食防食学会 第65回材料と環境討論会  2018.10 

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    Venue:富山  

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  • Tiに長時間形成した不働態皮膜に存在する結合水の存在状態と耐食性との関係

    藤本雄大, 今村昌仁, 廣畑洋平, 春名 匠

    腐食防食学会 第65回材料と環境討論会  2018.10 

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    Venue:富山  

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  • 濃度の異なる炭酸塩緩衝水溶液におけるAZ61Mg合金の分極曲線

    藤川翔平, 廣畑洋平, 春名 匠

    腐食防食学会 第65回材料と環境討論会  2018.10 

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    Venue:富山  

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  • 液膜の乾燥に伴うAlの孔食発生に及ぼすCl-濃度と表面電位の関係

    西田健太朗, 廣畑洋平, 春名 匠

    腐食防食学会 第65回材料と環境討論会  2018.10 

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    Venue:富山  

    若手講演優秀賞

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  • 硫化物分散型銅合金の耐エロージョン・コロージョン性に対する試験溶液の流量の影響

    安田由伸, 水谷直弘, 阿部弘幸, 松林良蔵, 丸山 徹, 春名 匠

    日本鋳造工学会 第172回全国講演大会講演概要集  2018.10 

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    Venue:石川県地場産業振興センター  

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  • 定湿度/乾燥の繰り返し試験中におけるさび付き純鉄の水素透過速度

    汪 洋, 山西 潤, 廣畑洋平, 春名 匠

    日本鉄鋼協会2018年度秋季講演大会概要集  2018.9 

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    Venue:東北大学  

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  • Ti不働態皮膜に存在する3種類の結合水に及ぼす皮膜形成時間の影響

    藤本雄大, 今村昌仁, 廣畑洋平, 春名 匠

    日本金属学会2018年度秋期講演大会概要集  2018.9 

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    Venue:東北大学  

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  • 濃度の異なるホウ酸塩緩衝水溶液におけるAZ61 Mg合金の分極曲線

    藤川翔平, 山西沙恵, 廣畑洋平, 春名 匠

    日本金属学会2018年度秋期講演大会概要集  2018.9 

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    Venue:東北大学  

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  • Alの大気腐食発生条件を調査するための表面電位測定装置の特性

    西田健太朗, 廣畑洋平, 春名 匠

    日本金属学会2018年度秋期講演大会概要集  2018.9 

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    Venue:東北大学  

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  • Hydrogen absorption forinto steels with microstructural defects in acidic acidic and neutral sulfate solutions

    T. Haruna, Y. Nii

    Proc. of Eurocorr2018, Kracow, Poland, Sep.9-13  2018.9 

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    Venue:Kracow , POLAND  

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  • Effect of Passivation Time on Stability of Passive Film Formed on Titanium in Sulfuric Acid Solution above 323 K

    T. Haruna, M. Imamura, Y. Hirohata

    Abst. of 69th ISE Meeting, Bologna, Italy, Sep.2-7  2018.9 

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    Venue:Bologna , ITALY  

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  • 試験溶液の流量を変えて実施した隙間噴流試験による硫化物分散型鉛フリー銅合金の耐エロージョン・コロージョン性評価

    安田吉伸, 水谷直弘, 阿部弘幸, 松林良蔵, 丸山 徹, 春名 匠

    第38回防錆防食技術発表会  2018.7 

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    Venue:東京ガーデンパレス  

    若手技術者優秀発表賞

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  • Comparison among the amounts of bound water in modified anodic aluminum-oxide films analyzed by GD-OES

    T. Haruna, M. Miyazaki, Y. Hirohata

    Abst. of the 8th Aluminium Surface Science and Technology Symposium  2018.5 

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    Venue:Helsingor , DENMARK  

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  • MgCl2濃度の異なる液膜下でのAlの孔食発生

    西田健太朗, 廣畑洋平, 春名 匠

    腐食防食学会材料と環境2018講演集  2018.5 

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    Venue:日本科学未来館  

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  • 大気腐食用pH分布測定システムのSUS304鋼への適用

    藤川翔平, 廣畑洋平, 春名 匠

    腐食防食学会材料と環境2018講演集  2018.5 

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    Venue:日本科学未来館  

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  • 液膜の乾燥過程におけるAlの孔食発生と液膜内Cl-濃度の関係

    西田健太朗, 廣畑洋平, 春名 匠

    日本金属学会 2018年度春期講演大会概要集  2018.3 

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    Venue:千葉工業大学  

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  • 濃度の異なるMgCl2液滴の乾燥に伴う304鋼の孔食発生挙動

    廣畑洋平, 寺岡愛莉, 春名 匠

    日本金属学会 2018年度春期講演大会概要集  2018.3 

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    Venue:千葉工業大学  

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  • 種々の濃度のMgCl2含有液滴に接触した304鋼の表面電位変化

    汪 洋, 廣畑洋平, 春名 匠

    日本金属学会 2018年度春期講演大会概要集  2018.3 

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    Venue:千葉工業大学  

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  • 大気腐食環境下におけるSUS304鋼へのpH分布測定システムの応用

    藤川翔平, 西田健太朗, 廣畑洋平, 春名 匠

    日本金属学会 2018年度春期講演大会概要集  2018.3 

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    Venue:千葉工業大学  

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  • MgCl2含有錆が付着した鋼材の水素透過速度に及ぼす相対湿度の影響

    春名 匠, 山西 潤, 廣畑洋平

    「大気暴露中の腐食誘起水素侵入に対する理解に向けてⅠ」シンポジウム資料  2018.3 

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    Venue:千葉工業大学  

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  • Alの大気腐食発生に及ぼす液膜内Cl-濃度の影響

    西田健太朗, 廣畑洋平, 春名 匠, 野田和彦

    軽金属学会関西支部「若手研究者・院生による研究発表会」  2017.12 

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    Venue:神戸大学  

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  • ホウ酸塩緩衝水溶液中におけるAZ61 Mg合金の腐食挙動に及ぼす溶液濃度の影響

    山西沙恵, 廣畑洋平, 春名 匠

    軽金属学会関西支部「若手研究者・院生による研究発表会」  2017.12 

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    Venue:神戸大学  

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  • 定電位電解でTiに形成した不働態皮膜の成長とその健全性

    今村昌仁, 廣畑洋平, 春名 匠

    軽金属学会関西支部「若手研究者・院生による研究発表会」  2017.12 

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    Venue:神戸大学  

    poster ベストポスター賞

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  • 乾湿繰り返しを行ったさびを生成させた純鉄の吸湿過程における水素侵入挙動

    山西 潤, 廣畑洋平, 春名 匠

    腐食防食学会第64回材料と環境討論会講演集  2017.11 

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    Venue:沖縄県市町村自治会館  

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  • 高温H2SO4水溶液中で長時間不働態化処理を行ったTiの耐孔食性

    今村昌仁, 廣畑洋平, 春名 匠

    腐食防食学会第64回材料と環境討論会講演集  2017.11 

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    Venue:沖縄県市町村自治会館  

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  • 模擬大気環境下におけるAlの孔食発生に及ぼす液膜厚さの影響

    西田健太朗, 廣畑洋平, 春名 匠, 野田和彦

    腐食防食学会第64回材料と環境討論会講演集  2017.11 

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    Venue:沖縄県市町村自治会館  

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  • 青色レーザー光を利用した電気化学的局部水素検出システムの開発

    春名 匠, 谷 美奈, 成子実花, 廣畑洋平

    腐食防食学会第64回材料と環境討論会講演集  2017.11 

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    Venue:沖縄県市町村自治会館  

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  • 長期浸漬により皮膜が形成した炭素鋼の濃厚臭化リチウム水溶液中における腐食挙動

    三輪佳祐, 入江智芳, 八鍬 浩, 廣畑洋平, 春名 匠

    腐食防食学会第64回材料と環境討論会講演集  2017.11 

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    Venue:沖縄県市町村自治会館  

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  • 腐⾷中に⾦属に局在化した⽔素の電気化学その場測定システムの開発

    春名 匠, 谷 美奈, 成子実花, 廣畑洋平

    溶接学会平成29年度秋季全国大会概要集  2017.9 

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    Venue:九州工業大学  

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  • さびを生成した純鉄への水素侵入に及ぼす乾湿繰り返しの影響

    山西 潤, 廣畑洋平, 春名 匠

    日本鉄鋼協会第174回秋季講演大会概要集  2017.9 

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    Venue:北海道大学  

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  • 模擬大気環境下におけるアルミニウムの孔食発生挙動

    西田健太朗, 富田 翔子, 廣畑洋平, 春名 匠, 野田和彦

    日本金属学会第161回秋期講演大会概要集  2017.9 

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    Venue:北海道大学  

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  • 高温H2SO4水溶液中で電気化学的に形成させたTi不働態皮膜の時間変化

    今村昌仁, 廣畑洋平, 春名 匠

    日本金属学会第161回秋期講演大会概要集  2017.9 

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    Venue:北海道大学  

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  • Hydrogen absorption behavior of the steels containing Cr and Ni under cathodic polarization in sulfate solutions

    T. Haruna, K. Takeuchi, T. Kasahara, Y. Nii, Y. Hirohata

    2017.9 

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    Venue:Praque, Chzech  

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  • 隙間噴流法試験による硫化物分散型鉛フリー銅合金の耐エロージョン・コロージョン性の評価

    安田吉伸, 水谷直弘, 阿部弘幸, 松林良蔵, 丸山 徹, 春名 匠

    第37回 防錆防食技術発表大会講演概要集  2017.7 

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    Venue:東京ガーデンパレス  

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  • Effects of annealing temperature on susceptibility to hydrogen embrittlement of interstital-free steel with ultra-fine-grain structure

    T. Haruna, Y. Nakagawa, Y. Hirohata, D. Tareda, N. Tsuji

    2017.6 

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    Venue:Rhodes, Greece  

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  • 鉛フリー銅合金CAC411へのめっき検討

    安田吉伸, 阿部弘幸, 吉居久光, 小寺善人, 松林良蔵, 春名 匠, 丸山 徹

    平成29年度産業技術連携推進会議製造プロセス部会第24回表面技術分科会  2017.6 

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    Venue:かごしま県民交流センター  

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  • MgCl2を用いてさびを生成させた純鉄への水素侵入に対する相対湿度の影響

    山西 潤, 廣畑洋平, 春名 匠

    材料と環境2017概要集  2017.5 

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    Venue:日本科学未来館  

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  • 塩基性水溶液中の鉄に形成したマグネタイト皮膜に対する重水の拡散浸透挙動

    春名 匠, 宮瀧裕貴, 廣畑洋平, 谷口直樹, 立川博一

    材料と環境2017概要集  2017.5 

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    Venue:日本科学未来館  

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  • 大気腐食環境下における304 鋼の孔食発生条件

    廣畑洋平, 寺岡愛莉, 春名 匠, 野田和彦

    日本金属学会 2017年度春期講演大会概要集  2017.3 

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    Venue:首都大学東京  

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  • 濃厚臭化リチウム水溶液中における炭素鋼の腐食挙動に及ぼす浸漬時間の影響

    三輪佳祐, 入江智芳, 廣畑洋平, 春名 匠

    日本金属学会 2017年度春期講演大会概要集  2017.3 

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    Venue:首都大学東京  

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  • 広範囲 pH 指示薬含有寒天を用いた大気腐食に伴う純鉄表面の pH 分布挙動

    西田健太朗, 廣畑洋平, 春名 匠, 野田和彦

    日本金属学会 2017年度春期講演大会概要集  2017.3 

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    Venue:首都大学東京  

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  • 錆が付着した鋼材の大気腐食中における水素透過挙動

    春名 匠, 山西 潤

    「大気腐食中の鋼材への水素侵入挙動の解明」フォーラム「腐食中の鋼材への水素侵入3」シンポジウム資料  2017.3 

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    Venue:首都大学東京  

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  • 高温酸性水溶液中において電気化学的に形成させたTi不働態皮膜のXPS解析

    今村昌仁, 廣畑洋平, 春名 匠

    日本金属学会 2017年度春期講演大会概要集  2017.3 

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    Venue:首都大学東京  

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  • Environment-assisted cracking of super-elastic TiNi alloy depending on solution pH and electrochemical potential

    T.Haruna, Y.Fujita, D.Morihashi, Y.Hirohata

    Mater. Sci. Forum  2017.1 

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  • 大気環境下におけるアルミニウムの腐食挙動解析

    廣畑洋平, 富田 翔子, 春名 匠

    軽金属学会関西支部「若手研究者・院生による研究発表会」  2016.12 

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    Venue:大阪府立大学  

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  • Ti不働態皮膜の耐孔食性に及ぼす皮膜形成時間と結合水量の影響

    今村昌仁, 廣畑洋平, 春名 匠

    軽金属学会関西支部「若手研究者・院生による研究発表会」  2016.12 

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    Venue:大阪府立大学  

    poster,ベストポスター賞

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  • 疑似大気環境下におけるアルミニウム表面の孔食発生挙動

    富田 翔子, 廣畑洋平, 春名 匠

    軽金属学会関西支部「若手研究者・院生による研究発表会」  2016.12 

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    Venue:大阪府立大学  

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  • ポーラス型Al陽極酸化皮膜の健全性に及ぼす皮膜変質電気量の影響

    宮﨑昌人, 廣畑洋平, 春名 匠

    軽金属学会関西支部「若手研究者・院生による研究発表会」  2016.12 

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    Venue:大阪府立大学  

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  • 表面のpH測定を用いた腐食解析

    西田健太朗, 廣畑洋平, 春名 匠

    材料化学特別研究会  2016.12 

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    Venue:芝浦工業大学  

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  • 腐食事例分析と対策理解のための腐食に関する基礎知識

    春名 匠

    プラント材溶接部腐食合同研究委員会 溶接部の腐食トラブル防止事例講習会  2016.12 

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  • 液膜存在下におけるステンレス鋼の大気腐食挙動

    廣畑洋平, 春名 匠

    日本材料学会腐食防食部門委員会第313回例会資料  2016.11 

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  • 硫化物分散型鉛フリー銅合金中のCu2Sのカソード分極による還元反応

    安田吉伸, 阿部弘幸, 松林良蔵, 丸山 徹, 春名 匠

    日本銅学会第56回講演大会講演概要集  2016.10 

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    Venue:東海大学  

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  • 塩化マグネシウムを用いてさびを生成させた純鉄の大気腐食に伴う水素侵入挙動

    山西 潤, 廣畑洋平, 春名 匠

    第63回材料と環境討論会講演概要集  2016.10 

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    Venue:大阪国際会議場  

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  • 大気中におけるステンレス鋼の孔食発生に及ぼすMgCl2液膜の影響

    廣畑洋平, 寺岡愛莉, 春名 匠, 野田和彦

    第63回材料と環境討論会講演概要集  2016.10 

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    Venue:大阪国際会議場  

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  • Al陽極酸化皮膜の電気化学的変質に伴う皮膜の健全性および結合

    宮﨑昌人, 廣畑洋平, 春名 匠

    第63回材料と環境討論会講演概要集  2016.10 

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    Venue:大阪国際会議場  

    若手講演奨励賞

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  • 組織の異なるTi-Fe合金の水素脆性

    三輪佳祐, 廣畑洋平, 春名 匠

    第63回材料と環境討論会講演概要集  2016.10 

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    Venue:大阪国際会議場  

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  • 高温酸性および高温中性水溶液中で形成したTi不働態皮膜に存在する結合水の定量

    今村昌仁, 廣畑洋平, 春名 匠

    第63回材料と環境討論会講演概要集  2016.10 

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    Venue:大阪国際会議場  

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  • さびを生成した純鉄の大気環境における水素侵入に及ぼす相対湿度の影響

    山西 潤, 廣畑洋平, 春名 匠

    材料とプロセス  2016.9 

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    Venue:大阪大学  

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  • 鉛フリー銅合⾦中の晶出物が及ぼす腐⾷への影響

    安田吉伸, 阿部弘幸, 松林良蔵, 丸山 徹, 春名 匠

    日本金属学会 2016 年度秋期講演大会概要集  2016.9 

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    Venue:大阪大学  

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  • Al陽極酸化皮膜の変質過程において変化する結合水量と耐孔食性

    宮﨑昌人, 廣畑洋平, 春名 匠

    日本金属学会 2016 年度秋期講演大会概要集  2016.9 

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    Venue:大阪大学  

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  • ステンレス鋼表面に付着させた液膜の乾燥過程における孔食の発生

    廣畑洋平, 寺岡愛莉, 春名 匠, 野田和彦

    日本金属学会 2016 年度秋期講演大会概要集  2016.9 

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    Venue:大阪大学  

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  • 大気環境下における純アルミニウムの腐食発生挙動の解析

    富田翔子, 春名 匠, 廣畑洋平, 野田和彦

    日本金属学会 2016 年度秋期講演大会概要集  2016.9 

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    Venue:大阪大学  

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  • 高温中性水溶液中におけるTi不働態化処理が皮膜中の結合水に与える影響

    今村昌仁, 廣畑洋平, 春名 匠

    日本金属学会 2016 年度秋期講演大会概要集  2016.9 

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    Venue:大阪大学  

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  • Ti-Fe合金の水素吸収量に及ぼす組織の影響

    三輪佳祐, 廣畑洋平, 春名 匠

    日本金属学会 2016 年度秋期講演大会概要集  2016.9 

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    Venue:大阪大学  

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  • 広範囲pH指示薬含有寒天を利用した大気腐食に伴う純鉄表面のpH挙動解析

    西田健太朗, 廣畑洋平, 春名 匠, 野田和彦

    日本金属学会 2016 年度秋期講演大会概要集  2016.9 

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    Venue:大阪大学  

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  • Effect of pH on Susceptibility to Environment-Assisted Cracking of AZ61 Mg Alloy

    T. Haruna, H. Ohshima, Y. Hirohata

    Abst. of Eurocorr2016,  2016.9 

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    Venue:Monpelie, France  

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  • ステンレス鋼の応力腐食割れに及ぼす環境因子の影響

    春名 匠

    腐食防食学会関西支部 第9回腐食・防食セミナー  2016.8 

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  • Quantification of bound water in anodic oxide film formed on aluminum and correlation between the water and stability of the film

    M. Miyazaki, Y. Hirohata, T. Haruna

    Abst. of the 9th Pacific Rim International Conference on Advanced Materials and Processing(PRICM9),  2016.8 

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    Venue:Kyoto, Japan  

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  • Modification condition of cathodic film formed on Ti in ethanol solution containing calcium ions

    T. Haruna, R. Minakata, T. Mizuguchi, A. Nonaka, S. Imagawa

    Abst. of the 9th Pacific Rim International Conference on Advanced Materials and Processing(PRICM9),  2016.8 

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    Venue:Kyoto, Japan  

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  • Environment-assisted cracking of super-elastic TiNi alloy depending on solution pH and electrochemical potential

    T. Haruna, Y. Fujita, D. Morihashi, Y. Hirohata

    Abst. of Thermec2016,  2016.5 

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    Venue:Graz, Austria  

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  • Ti表面に形成させたCa(OH)2皮膜の変質と保管条件との関係

    春名 匠, 南方良太, 水口拓也

    軽金属学会第130回春期大会講演概要集  2016.5 

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    Venue:大阪大学  

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  • α+β型Ti-Fe合金の水素脆性に及ぼす組織の影響

    三輪佳祐, 廣畑洋平, 春名 匠

    軽金属学会第130回春期大会講演概要集  2016.5 

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    Venue:大阪大学  

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  • 硫酸水溶液中で形成したポーラス型Al陽極酸化皮膜の水素量と変質処理電位の相関性

    宮﨑昌人, 廣畑洋平, 春名 匠

    軽金属学会第130回春期大会講演概要集  2016.5 

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    Venue:大阪大学  

    優秀ポスター発表賞

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  • Ti不働態皮膜中に含まれる結合水の深さ方向分析

    今村昌仁, 廣畑洋平, 春名 匠

    軽金属学会第130回春期大会講演概要集  2016.5 

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    Venue:大阪大学  

    poster,優秀ポスター発表賞

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  • Fe添加濃度を変化させたα+β型Ti-Fe合金の水素脆性

    三輪佳祐, 廣畑洋平, 春名 匠

    MMAD研究会  2016.3 

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    Venue:関西大学  

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  • 大気の湿度がさびを付着させた純鉄への水素侵入挙動に及ぼす影響

    山西 潤, 廣畑洋平, 春名 匠

    MMAD研究会  2016.3 

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    Venue:関西大学  

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  • 高温・長時間のTi不働態化処理が皮膜中の結合水に与える影響

    今村昌仁, 廣畑洋平, 春名 匠

    MMAD研究会  2016.3 

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    Venue:関西大学  

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  • Al陽極酸化皮膜の健全性を向上させる結合水量の役割

    宮﨑昌人, 廣畑洋平, 春名 匠

    MMAD研究会  2016.3 

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    Venue:関西大学  

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  • 塩化マグネシウムを含むさび層を形成させた純鉄の大気腐食に伴う水素透過挙動

    山西 潤, 春名 匠,

    材料とプロセス  2016.3 

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    Venue:東京理科大  

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  • ポーラス型Al陽極酸化皮膜に存在する水素量と変質処理電位との相関性

    宮﨑 昌人, 春名 匠,

    日本金属学会 2016 年度春期講演大会  2016.3 

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    Venue:東京理科大  

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  • 大気環境下におけるステンレス鋼の孔食発生条件の解析

    廣畑洋平, 太田博貴, 春名 匠, 野田和彦

    日本金属学会 2016 年度春期講演大会  2016.3 

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    Venue:東京理科大  

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  • α+β型Ti-Fe合金への水素化物の形成

    三輪佳祐, 春名 匠,

    日本金属学会 2016 年度春期講演大会  2016.3 

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    Venue:東京理科大  

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  • Ti不働態皮膜中に存在する結合水量と皮膜厚さとの関係

    今村昌仁, 春名 匠,

    日本金属学会 2016 年度春期講演大会  2016.3 

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    Venue:東京理科大  

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  • Ti-Fe合金の水素化物形成に及ぼす組織の影響

    三輪佳祐, 春名 匠,

    軽金属学会関西支部「若手研究者・院生による研究発表会」  2015.12 

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    Venue:大阪府大  

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  • 炭酸塩/重炭酸塩含有環境下におけるAZ61Mg合金の腐食挙動

    甲斐将史, 春名 匠,

    軽金属学会関西支部「若手研究者・院生による研究発表会」  2015.12 

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    Venue:大阪府大  

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  • 変質処理を施したAlアノード酸化皮膜の耐孔食性と結合水量の関連性

    宮﨑昌人, 春名 匠,

    軽金属学会関西支部「若手研究者・院生による研究発表会」  2015.12 

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    Venue:大阪府大  

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  • Ti不働態皮膜中に存在する結合水の定量とその不働態化処理時間依存性

    今村昌仁, 春名 匠,

    軽金属学会関西支部「若手研究者・院生による研究発表会」  2015.12 

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    Venue:大阪府大  

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  • Effect of bound water on stability of anodic oxide film formed on aluminum in sulfuric acid

    Takumi Haruna, Takao Ikeda, Akio Nishimoto

    2015.12 

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    Venue:Kansai Univ.  

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  • 硫化物分散型鉛フリー銅合金CAC411中の硫化物が及ぼすめっきへの影響

    安田吉伸, 阿部弘幸, 松林良蔵, 吉居久光, 小寺善人, 丸山 徹, 春名 匠

    第17回関西表面技術フォーラム  2015.11 

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    Venue:甲南大学  

    優秀講演賞

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  • Ti不働態皮膜の安定性に及ぼす結合水量の影響

    春名 匠, 西本明生

    軽金属学会第129回秋期講演大会  2015.11 

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    Venue:日本大学  

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  • ホウ酸緩衝水溶液中で形成したAl陽極酸化皮膜の耐孔食性と結合水量の関連性

    宮﨑昌人, 西本明生, 春名 匠,

    軽金属学会第129回秋期講演大会  2015.11 

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    Venue:日本大学  

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  • 濃厚臭化リチウム水溶液中における炭素鋼の腐食挙動に対する環境因子の影響

    森橋大樹, 入江智芳, 春名 匠,

    第62回材料と環境討論会講演概要集  2015.11 

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    Venue:福岡工大  

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  • バリア型 Al陽極酸化皮膜の健全性に及ぼす結合水量の影響

    宮﨑昌人, 西本明生, 春名 匠,

    第62回材料と環境討論会講演概要集  2015.11 

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    Venue:福岡工大  

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  • 炭酸塩緩衝水溶液のイオン種とその濃度がAZ61Mg合金の腐食特性に及ぼす影響

    甲斐将史, 春名 匠,

    日本金属学会 2015 年度秋期講演大会  2015.9 

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    Venue:九州大学  

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  • バリア型Al陽極酸化皮膜の耐孔食性と結合水量の関係

    宮﨑昌人, 西本明生, 春名 匠,

    日本金属学会 2015 年度秋期講演大会  2015.9 

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    Venue:九州大学  

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  • Behavior of hydrogen absorption to iron promoted by additional elements

    Takumi Haruna, Yamato Nii

    材料とプロセス  2015.9 

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    Venue:九州大学  

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  • 高電位域における鉄鋼材料への水素侵入挙動に及ぼす添加元素の影響

    新居大和, 春名 匠,

    材料とプロセス  2015.9 

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    Venue:九州大学  

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  • 硫化物分散型鉛フリー銅合金CAC411中の硫化物が及ぼすめっきへの影響

    安田吉伸, 阿部弘幸, 吉居久光, 小寺善人, 松林良蔵, 春名 匠, 丸山 徹

    表面技術協会第132回講演大会  2015.9 

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    Venue:信州大学  

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  • Correlation Between Amount of Bound Water and Stability of Anodic Oxide Film on Aluminum

    Takumi Haruna, Takao Ikeda, Akio Nishimoto

    2015.5 

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  • TiNi超弾性合金中に侵入させた水素の存在状態の経時変化

    森橋大樹, 早川瑞穂, 春名 匠,

    日本金属学会 2015 年度春期講演大会  2015.3 

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    Venue:東京大学  

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  • 不働態化処理時間の異なるTiの耐孔食性と不働態皮膜の組成との関連性

    宮崎昌人, 春名 匠,

    日本金属学会 2015 年度春期講演大会  2015.3 

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    Venue:東京大学  

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  • TiNi超弾性合金中に侵入させた水素の存在状態の経時変化

    森橋大樹, 早川瑞穂, 春名 匠

    日本金属学会 2015 年度春期講演大会  2015.3 

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    Venue:東京大学  

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  • 不働態化処理時間の異なるTiの耐孔食性と不働態皮膜の組成との関連性

    宮崎昌人, 春名 匠

    日本金属学会 2015 年度春期講演大会  2015.3 

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    Venue:東京大学  

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  • Tiの水素吸収量に及ぼすFe添加の影響

    安居尚志, 春名 匠

    軽金属学会関西支部「若手研究者・院生による研究発表会」  2014.12 

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    Venue:関西大学  

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  • Tiの水素吸収量に及ぼすFe添加の影響

    安居尚志, 春名 匠,

    軽金属学会関西支部「若手研究者・院生による研究発表会」  2014.12 

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    Venue:関西大学  

    口頭発表 優秀発表者賞

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  • NaCl水溶液中で変質させたAl陽極酸化皮膜の健全性に及ぼす結合水量の影響

    池田貴勇, 春名 匠

    軽金属学会関西支部「若手研究者・院生による研究発表会」  2014.12 

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    Venue:関西大学  

    poster ベストポスター賞

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  • NaCl水溶液中で変質させたAl陽極酸化皮膜の健全性に及ぼす結合水量の影響

    池田貴勇, 春名 匠,

    軽金属学会関西支部「若手研究者・院生による研究発表会」  2014.12 

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    Venue:関西大学  

    ベストポスター賞

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  • Alの模擬孔食進展中に発生する水素量と塩化物イオン濃度の影響

    三浦大知, 春名 匠,

    軽金属学会関西支部「若手研究者・院生による研究発表会」  2014.12 

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    Venue:関西大学  

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  • Alの模擬孔食進展中に発生する水素量と塩化物イオン濃度の影響

    三浦大知, 春名 匠

    軽金属学会関西支部「若手研究者・院生による研究発表会」  2014.12 

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    Venue:関西大学  

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  • 大気中で鉄を高温酸化させた皮膜中への重水の拡散浸透挙動

    春名 匠, 山本達也, 宮入洋志, 柴田俊夫, 谷口直樹, 坂巻景子, 立川博一

    第61回材料と環境討論会講演概要集  2014.11 

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    Venue:米子  

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  • TiNi超弾性合金中に侵入した水素の存在状態と水素脆化の関係

    森橋大樹, 春名 匠,

    第61回材料と環境討論会講演概要集  2014.11 

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    Venue:米子  

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  • SUS304鋼不働態皮膜の健全性に及ぼす結合水の存在状態

    池田貴勇, 春名 匠,

    第61回材料と環境討論会講演概要集  2014.11 

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    Venue:米子  

    コンペティション 若手優秀講演賞

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  • 種々のNaCl水溶液中におけるAlの模擬孔食進展挙動と水素発生

    三浦大知, 春名 匠,

    第61回材料と環境討論会講演概要集  2014.11 

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    Venue:米子  

    コンペティション

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  • 熱処理によるアノード酸化ポーラスアルミナの脱水と結晶化過程

    阿相英孝, 増田達也, 池田貴勇, 春名 匠, 小野幸子

    軽金属学会第127回秋期講演大会  2014.11 

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    Venue:東京工業大学  

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  • Ti不働態皮膜中の結合水量と皮膜形成時間との相関性

    春名 匠, 伊藤 傑, 木許圭一郎

    軽金属学会第127回秋期講演大会  2014.11 

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    Venue:東京工業大学  

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  • Al陽極酸化皮膜への変質処理に伴う皮膜の健全性と結合水量との相関性

    池田貴勇, 春名 匠,

    軽金属学会第127回秋期講演大会  2014.11 

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    Venue:東京工業大学  

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  • 硫化物分散型鉛フリー銅合金の分極測定を用いた特性評価

    安田吉伸, 阿部弘幸, 松林良蔵, 丸山 徹, 春名 匠

    日本銅学会第54回講演大会  2014.11 

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    Venue:横浜国立大学  

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  • 添加元素の異なる鉄鋼材料への水素侵入挙動

    新居大和, 笠原朋樹, 春名 匠

    材料とプロセス  2014.9 

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    Venue:名古屋大学  

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  • 相対湿度を制御した大気中におけるさびを生成した純鉄への水素侵入挙動

    宮入洋志, 春名 匠,

    材料とプロセス  2014.9 

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    Venue:名古屋大学  

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  • Al陽極酸化皮膜の耐食性に及ぼす結合水量の影響

    池田貴勇, 春名 匠,

    日本金属学会 2014 年度秋期講演大会  2014.9 

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    Venue:名古屋大学  

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  • Ti-Fe合金の水素吸収速度に及ぼすFe濃度の影響

    安居尚志, 春名 匠,

    日本金属学会 2014 年度秋期講演大会  2014.9 

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    Venue:名古屋大学  

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  • Alの模擬孔食進展挙動に及ぼす塩化物イオン濃度の影響

    三浦大知, 西脇大貴, 西川碧, 春名 匠

    日本金属学会 2014 年度秋期講演大会  2014.9 

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    Venue:名古屋大学  

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  • TiNi超弾性合金中における水素の存在状態

    森橋大樹, 春名 匠,

    日本金属学会 2014 年度秋期講演大会  2014.9 

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    Venue:名古屋大学  

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  • Corrosion Behavior of Ti-Ca Alloy in Aqueous Fluoride Solutions

    Takumi Haruna, Itsuki Shinohara

    2014.8 

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    Venue:Lausanne, Switzerland  

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  • Effect of Potential on Hydrogen Evolution during Pitting of Aluminum

    Takumi Haruna, Daiki Nishiwaki, Midori Nishikawa

    2014.6 

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    Venue:Tronheim, Norway  

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  • マルテンサイト系ステンレス鋼の高温窒素固溶処理における挙動

    岩佐康弘, 松田茂敬, 土井研児, 寺内俊太郎, 春名 匠

    第77回熱処理技術協会春季講演大会  2014.6 

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    Venue:東京工業大学  

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  • Al陽極酸化皮膜の健全性に及ぼす結合水量の影響

    池田貴勇, 春名 匠,

    第126回軽金属学会春期大会講演概要集  2014.5 

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    Venue:広島大学  

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  • 鉄鋼材料の水素侵入挙動と電位の関係

    新居大和, 春名 匠

    MMAD研究会  2014.3 

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    Venue:関西大学  

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  • 超弾性TiNi合金中における侵入水素の挙動

    森橋大樹, 春名 匠

    MMAD研究会  2014.3 

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    Venue:関西大学  

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  • TiNi超弾性合金への水素侵入挙動

    森橋大樹, 春名 匠

    第154回日本金属学会2014年春期講演大会概要集  2014.3 

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    Venue:東京工業大学  

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  • 高強度鉄鋼材料への水素侵入挙動に及ぼす電位の影響

    新居大和, 春名 匠

    材料とプロセス  2014.3 

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    Venue:東京工業大学  

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  • 鉄鋼材料への水素侵入挙動に及ぼす添加元素の影響

    笠原朋樹, 春名 匠

    材料とプロセス  2014.3 

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    Venue:東京工業大学  

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  • AZ61マグネシウム合金の環境脆化挙動に及ぼす環境因子の影響

    大島裕史, 春名 匠

    軽金属学会関西支部「若手研究者・院生による研究発表会」  2013.12 

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    Venue:兵庫県立大学  

    poster ベストポスター賞

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  • β型Ti-Fe合金の水素吸収に及ぼす電位の影響

    安居尚志, 春名 匠

    軽金属学会関西支部「若手研究者・院生による研究発表会」  2013.12 

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    Venue:兵庫県立大学  

    poster ベストポスター賞

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  • 硫化物分散型鉛フリー青銅の腐食に及ぼす電位の影響

    春名 匠, 織田大輝, 丸山 徹, 小林 武

    第53回日本銅学会講演大会講演概要集  2013.11 

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    Venue:関西大学  

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  • Ti 不働態皮膜中の結合水量と皮膜形成温度との相関性

    春名 匠, 伊藤 傑

    第125回軽金属学会秋期大会講演概要集  2013.11 

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    Venue:横浜国立大学  

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  • 炭酸イオン含有環境下におけるマグネシウム合金の環境脆化挙動

    大島裕史, 春名 匠

    第125回軽金属学会秋期大会講演概要集  2013.11 

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    Venue:横浜国立大学  

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  • SUS304鋼の模擬孔食進展挙動における臭化物および塩化物イオンの相違

    三浦大知, 本庄由里絵, 春名 匠

    第60回材料と環境討論会講演集  2013.9 

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    Venue:コラッセ福島  

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  • NaCl水溶液中で変質させたSUS304鋼不動態皮膜の健全性に及ぼす結合水量の影響

    池田貴勇, 春名 匠,

    第60回材料と環境討論会講演集  2013.9 

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    Venue:コラッセ福島  

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  • 低合金高強度鋼の水素脆化感受性に及ぼす焼戻時間の影響

    榎本 賢, 春名 匠, 秋岡幸司, 薮口歩美, 松本雅充, 大村朋彦

    材料とプロセス  2013.9 

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    Venue:金沢大学  

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  • AZ61マグネシウム合金の環境脆化挙動に及ぼすpHの影響

    大島裕史, 春名 匠

    第153回日本金属学会2013年秋期講演大会概要集  2013.9 

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    Venue:金沢大学  

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  • 炭素鋼表面に形成したマグネタイト皮膜への重水の拡散

    宮入洋志, 山本達也, 春名 匠, 柴田俊夫

    第153回日本金属学会2013年秋期講演大会概要集  2013.9 

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    Venue:金沢大学  

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  • Ti-Fe合金の水素吸収に及ぼすFe添加の影響

    安居尚志, 雉鳥紗希, 春名 匠

    第153回日本金属学会2013年秋期講演大会概要集  2013.9 

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    Venue:金沢大学  

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  • 相対湿度を制御した大気中におけるさび層を形成させた炭素鋼の腐食挙動

    高木祥太, 庄司祐樹, 春名 匠, 鹿島和幸, 上村隆之, 幸 英昭

    材料とプロセス  2013.9 

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    Venue:金沢大学  

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  • Effects of stress and sigma value at grain boundary on crack propagation for sensitized 304 stainless steel with coarse grains

    Takumi HARUNA, Takayuki Shimizu, Masayuki Kamaya

    2013.9 

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    Venue:Estoril, Portgal  

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  • Effect of pH on susceptibility to environment-assisted cracking of AZ31 Mg alloy

    Takumi HARUNA, Ryota Kishimoto

    2013.8 

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    Venue:Hawaii, USA  

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  • 濃厚臭化リチウム水溶液中における炭素鋼の腐食挙動の経時変化

    小寺亮太, 入江智芳, 春名 匠

    材料と環境2013講演集  2013.5 

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    Venue:東京電機大学  

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  • 湿度を制御した大気環境下における錆を生成した鉄への水素侵入

    春名 匠, 庄司裕樹

    材料とプロセス  2013.3 

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    Venue:東京電機大学  

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  • フッ化物水溶液中において浸漬時間を変化させたTi-Mo合金の耐食性に及ぼす表面性状の影響

    小寺亮太, 春名 匠

    2012年度MMAD研究会  2013.3 

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    Venue:関西大学  

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  • Ca2+/エタノール溶液中におけるTiへのカソード皮膜形成および大気中での変質挙動

    野中厚志, 春名 匠

    軽金属学会関西支部「若手研究者・院生による研究発表会」  2012.12 

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    Venue:大阪工業大学  

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  • NaCl水溶液中におけるアルミニウムの模擬孔食進展と水素発生との関係

    西脇大貴, 春名 匠

    軽金属学会関西支部「若手研究者・院生による研究発表会」  2012.12 

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    Venue:大阪工業大学  

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  • Ti上に生成させたカソード皮膜の性状に及ぼす保管条件の影響

    大島裕史, 野中厚志, 春名 匠

    日本金属学会/日本鉄鋼協会関西支部材料開発研究会平成24年度第4回研究会  2012.12 

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    Venue:関西大学  

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  • Ti不働態皮膜中の結合水と耐孔食性の関係

    伊東 傑, 春名 匠

    日本金属学会/日本鉄鋼協会関西支部材料開発研究会平成24年度第4回研究会  2012.12 

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    Venue:関西大学  

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  • 超微細粒IF鋼の水素脆化挙動

    春名 匠

    平成24年度腐食防食学会中部支部講演会  2012.12 

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    Venue:岐阜県  

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  • 湿度を制御した大気環境下における錆を生成した鉄の大気腐食に伴う水素侵入

    庄司裕樹, 春名 匠

    日本金属学会/日本鉄鋼協会関西支部材料化学研究会平成24年度第2回講演会  2012.12 

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    Venue:大阪大学  

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  • 低合金高強度鋼の水素脆化に及ぼす水素導入時間の影響

    榎本 賢, 田島宜周, 前田真吾, 春名 匠, 秋岡幸司, 薮口歩美, 松本雅充

    日本金属学会/日本鉄鋼協会関西支部材料化学研究会平成24年度第2回講演会  2012.12 

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    Venue:大阪大学  

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  • No11.「腐食・防食工学」

    春名 匠

    関西経済連合会材料講習会実践的プログラム「金属・材料工学」  2012.12 

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  • Ca2+/エタノール溶液中でTiに形成されたカソード皮膜の大気中における変質挙動

    野中厚志, 大島裕史, 春名 匠

    第123回軽金属学会秋期大会講演概要集  2012.11 

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    Venue:千葉工大  

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  • 種々の環境下でTi上に生成させたカソード皮膜の特性

    大島裕史, 野中厚志, 春名 匠

    第123回軽金属学会秋期大会講演概要集  2012.11 

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    Venue:千葉工大  

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  • Effect of Humidity of Atmosphere on Characteristics of Cathodic Film Formed on Ti in Ca2+/Ethanol Solution

    2012.10 

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    Venue:Hawaii, USA  

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  • Effect of Passivation Potential on Amount of Bound Water in Passive Film on Titanium

    2012.10 

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    Venue:Hawaii, USA  

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  • Characterization of Bound Water in Passive Film of Titanium Formed in H2SO4 Solution

    2012.10 

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    Venue:Hawaii, USA  

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  • Ti不働態皮膜中の結合水の結合状態と耐孔食性の関係

    伊東 傑, 春名 匠

    第59回材料と環境討論会講演集  2012.9 

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    Venue:旭川  

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  • フッ化物水溶液中に予備浸漬させたTi-Mo合金の耐食性

    小寺亮太, 小西龍郎, 春名 匠

    第59回材料と環境討論会講演集  2012.9 

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    Venue:旭川  

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  • Ca2+/エタノール溶液中でTiに形成されたカソード皮膜の変質に及ぼす大気環境の影響

    野中厚志, 春名 匠

    第151回日本金属学会2012年秋期講演大会概要集  2012.9 

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    Venue:愛媛大学  

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  • フッ化物水溶液中に長時間浸漬したTi-Mo合金の耐食性と表面性状

    小寺亮太, 小西龍郎, 春名 匠

    第151回日本金属学会2012年秋期講演大会概要集  2012.9 

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    Venue:愛媛大学  

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  • Ti不働態皮膜中の結合水に及ぼす皮膜形成温度の影響

    伊東 傑, 春名 匠

    第151回日本金属学会2012年秋期講演大会概要集  2012.9 

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    Venue:愛媛大学  

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  • 錆が付着した鉄の吸湿・放湿過程と水素侵入挙動の関係

    庄司裕樹, 春名 匠, 鹿島和幸, 上村隆之, 幸 英昭

    材料とプロセス,第165回春季講演大会概要集  2012.9 

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    Venue:愛媛大学  

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  • さび層を形成させた低合金鋼の放湿・吸湿挙動

    高木祥太, 庄司裕樹, 鄭 泰行, 鹿島和幸, 上村隆之, 幸 英昭, 春名 匠

    材料とプロセス,第165回春季講演大会概要集  2012.9 

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    Venue:愛媛大学  

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  • 低合金高強度鋼の水素脆化感受性に及ぼす水素侵入量の影響

    榎本 賢, 田島宜周, 前田真吾, 秋岡幸司, 薮口歩美, 松本雅充, 春名 匠

    材料とプロセス,第165回春季講演大会概要集  2012.9 

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    Venue:愛媛大学  

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  • 気相法表面改質による耐食性チタン合金の開発

    春名 匠

    日本金属学会分科会シンポジウム「チタン合金の新展開-チタンが切り拓く新用途と新技術」  2012.7 

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  • Development of Titanium Alloys with Corrosion Resistance in Aqueous Fluoride Solutions (Keynote lecture)

    T. Haruna

    2012.4 

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    Venue:, China National Convention Center, Beijing, China  

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  • 繰り返し重ね圧延法で作製した超微細粒鋼に対する水素侵入挙動と水素脆化

    春名 匠, 寺田大将(京都大学), 辻 伸泰(京都大学)

    日本鉄橋協会「大気腐食反応に伴う水素発生・侵入の検出と界面反応機構の解明」フォーラムシンポジウム  2012.3 

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  • フッ化物水溶液中におけるTi - Mo合金の耐食性に及ぼす浸漬時間の影響

    小寺亮太(D), 小西龍郎(D), 春名 匠

    第150回日本金属学会2012年春期講演大会概要集  2012.3 

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    Venue:横浜国立大学  

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  • 温度を変化させたCa2+/メタノール溶液中でTi上に形成したカソード皮膜の性状

    大島裕史(D), 野中厚志(D), 春名 匠

    第150回日本金属学会2012年春期講演大会概要集  2012.3 

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    Venue:横浜国立大学  

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  • 鉄さびの吸湿・放湿特性

    庄司裕樹(D), 春名 匠, 鹿島和幸(住友金属工業), 上村隆之(住友金属工業), 幸 英昭(住友金属工業)

    第16回関西大学先端科学技術シンポジウムポスターセッション  2012.1 

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    Venue:関西大学  

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  • Ti不働態皮膜の耐孔食性と結合水量に及ぼす皮膜形成電位の影響

    伊東 傑(D), 春名 匠

    第16回関西大学先端科学技術シンポジウムポスターセッション  2012.1 

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    Venue:関西大学  

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  • フッ化物水溶液中におけるTi – Mo合金の耐食性に及ぼすMo濃度の影響

    小西龍郎(D), 春名 匠

    第16回関西大学先端科学技術シンポジウムポスターセッション  2012.1 

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    Venue:関西大学  

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  • 塩化物水溶液中におけるアルミニウムの模擬孔食進展挙動に及ぼす塩化物イオン濃度の影響

    西脇大貴(D), 春名 匠

    第16回関西大学先端科学技術シンポジウムポスターセッション  2012.1 

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    Venue:関西大学  

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  • H2O濃度を制御したCa2+/エタノール溶液中でのカソード分極によるTi表面へのCa皮膜形成

    野中厚志(D), 春名 匠

    第16回関西大学先端科学技術シンポジウムポスターセッション  2012.1 

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    Venue:関西大学  

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  • ねじの腐食の基礎知識

    春名 匠

    関西大学連続セミナー「ものづくり基盤技術」in MOBIO 第2講「ねじの多様性」  2011.12 

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  • The Effect of Iron Addition on Hydrogen Absorption to Titanium

    2011.11 

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    Venue:Perth, Australia  

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  • Effect of Passivation Temperature on Stability of Passive Film and Amount of Bound Water for Stainless Steel

    2011.11 

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    Venue:Perth, Australia  

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  • チタン・チタン合金の腐食機構および機械的性質に関して

    春名 匠

    日本材料学会 腐食防食部門委員会 第283回例会  2011.11 

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  • Ti 不働態皮膜の耐孔食性と結合水濃度に及ぼす皮膜形成電位の影響

    伊東 傑(D), 春名 匠

    軽金属学会第121回秋季大会講演概要集  2011.11 

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    Venue:早稲田大学  

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  • H2O濃度を制御したCa2+/エタノール溶液中でTiに印加したカソード電位がCa皮膜形成に与える影響

    野中厚志(D), 春名 匠

    軽金属学会第121回秋季大会講演概要集  2011.11 

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    Venue:早稲田大学  

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  • Ti-Fe合金の水素吸収におよぼす電位の影響

    雉鳥紗希(D), 春名 匠

    第149回日本金属学会2011年秋期講演大会概要集  2011.11 

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    Venue:沖縄コンベンションセンター  

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  • H2O濃度を制御したCa2+/エタノール溶液中でカソード分極したTiへのCa皮膜形成

    野中厚志(D), 春名 匠

    第149回日本金属学会2011年秋期講演大会概要集  2011.11 

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    Venue:沖縄コンベンションセンター  

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  • Ti不働態皮膜中の結合水量に及ぼす皮膜形成電位の影響

    伊東 傑(D), 春名 匠

    第149回日本金属学会2011年秋期講演大会概要集  2011.11 

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    Venue:沖縄コンベンションセンター  

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  • 湿潤・乾燥環境下における鉄さびの吸湿・放湿挙動を調査するための装置の開発

    庄司裕樹(D), 春名 匠, 鹿島和幸(住友金属工業), 上村隆之(住友金属工業), 幸 英昭(住友金属工業)

    第149回日本金属学会2011年秋期講演大会概要集  2011.11 

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    Venue:沖縄コンベンションセンター  

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  • Tiの水素吸収挙動に与えるFe添加量の影響

    雉鳥紗希(D), 春名 匠

    第58回材料と環境討論会講演集  2011.9 

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    Venue:名古屋大学  

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  • 鉄さびの吸湿・放湿試験装置の開発

    庄司裕樹(D), 春名 匠, 鹿島和幸(住友金属工業), 上村隆之(住友金属工業), 幸 英昭(住友金属工業)

    第58回材料と環境討論会講演集  2011.9 

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    Venue:名古屋大学  

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  • フッ化物水溶液中におけるTi-Mo合金の耐食性評価

    小西龍郎(D), 春名 匠

    第58回材料と環境討論会講演集  2011.9 

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    Venue:名古屋大学  

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  • Development of Titanium Alloys with Corrosion Resistance in Aqueous Fluoride Solutions (Keynote lecture)

    HARUNA,Takumi

    2011.6 

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    Venue:Beijing, China  

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  • 粗粒SUS304鋼における個々の粒界での対応性と鋭敏化ならびに粒界型環境脆化との関連性

    春名 匠, 清水貴之(D), 釜谷昌幸(原子力安全システム研究所)

    材料と環境2011講演大会概要集  2011.5 

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    Venue:早稲田大学  

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  • FeもしくはNiを添加したTiの水素吸収挙動におよぼす電位の影響

    雉鳥紗希(D), 西澤拓磨(D), 春名 匠

    第120回軽金属学会春期大会講演概要集  2011.5 

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    Venue:名古屋大学  

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  • 塩化物イオン濃度とpHを変化させた水溶液中におけるMg合金の環境脆化感受性

    春名 匠, 岸本諒太(D)

    第120回軽金属学会春期大会講演概要集  2011.5 

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    Venue:名古屋大学  

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  • アルミニウムの模擬孔食進展挙動に及ぼす塩化物イオン濃度および電位の影響

    春名 匠, 西川 碧(B)

    第120回軽金属学会春期大会講演概要集  2011.5 

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    Venue:名古屋大学  

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  • ナノ材料にもとづいた高度環境化学技術の開発プロジェクト

    岡田芳樹, 鈴木俊光, 室山勝彦, 三宅義和, 小田廣和, 三宅孝典, 越智光一, 幸塚広光, 田實佳郎, 池永直樹, 春名 匠

    関大ORDIST技苑  2011.3 

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  • Alの模擬孔食成長速度に及ぼす塩化物イオン濃度の影響

    西川 碧(B), 岸本諒太(D), 春名 匠

    平成22年度軽金属学会関西支部若手研究発表会  2011.1 

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    Venue:関西大学  

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  • Tiの水素吸収挙動に及ぼすFe添加の影響

    雉鳥紗希(D), 春名 匠

    平成22年度軽金属学会関西支部若手研究発表会  2011.1 

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    Venue:関西大学  

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  • Tiの耐孔食性に及ぼす不働態皮膜形成電位と結合水の影響

    伊東 傑(B), 廣瀬将己(D), 春名 匠

    平成22年度軽金属学会関西支部若手研究発表会  2011.1 

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    Venue:関西大学  

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  • AZ31Mg合金の環境脆化挙動に及ぼす環境因子の影響

    岸本諒太(D), 春名 匠

    平成22年度軽金属学会関西支部若手研究発表会  2011.1 

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    Venue:関西大学  

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  • Ca2+/エタノール溶液中におけるTi表面のカソード皮膜形成に及ぼす温度の影響

    野中厚志(B), 春名 匠

    平成22年度軽金属学会関西支部若手研究発表会  2011.1 

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    Venue:関西大学  

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  • フッ化物水溶液中において高耐食性を発現するTi-Mo合金の開発

    小西龍郎(B), 雉鳥紗希(D), 春名 匠

    平成22年度軽金属学会関西支部若手研究発表会  2011.1 

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    Venue:関西大学  

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  • ステンレス鋼とチタンの表面に形成したナノ金属酸化物薄膜の耐環境遮断特性

    春名 匠, 廣瀬将己(D), 石地寛太(B), 木許圭一郎(B)

    第15回先端科学技術シンポジウムHRC「高度環境化学」プロジェクトセッション  2011.1 

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    Venue:関西大学  

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  • ステンレス鋼とチタンの表面に形成したナノ金属酸化物薄膜の耐環境遮断特性

    春名 匠, 廣瀬将己, 石地寛太, 木許圭一郎

    第15回関西大学先端科学技術シンポジウム講演集  2011.1 

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  • 腐食環境下におけるマグネシウム合金の脆化挙動

    春名 匠, 岸本諒太(D)

    第38回高性能Mg合金創成加工研究会講演概要集  2010.12 

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  • フッ化物水溶液中におけるTi-Ni合金の腐食挙動に及ぼす浸漬時間の影響

    雉鳥紗希(D), 春名 匠

    第57回材料と環境討論会講演集  2010.10 

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    Venue:沖縄自治会館  

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  • 超微細粒IF鋼の水素脆化感受性に及ぼすARBサイクル数の影響

    石元裕貴(D), 春名 匠, 寺田大将(京都大学), 辻 伸泰(京都大学)

    第57回材料と環境討論会講演集  2010.10 

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    Venue:沖縄自治会館  

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  • AZ31マグネシウム合金の環境脆化挙動に及ぼすpHの役割

    岸本諒太(D), 春名 匠

    第57回材料と環境討論会講演集  2010.10 

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    Venue:沖縄自治会館  

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  • SUS304鋼の孔食発生に及ぼす不働態皮膜中の結合水の効果

    廣瀬将己(D), 春名 匠

    第57回材料と環境討論会講演集  2010.10 

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    Venue:沖縄自治会館  

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  • 粗粒鋭敏化SUS304鋼のき裂進展に及ぼす粒界面応力と粒界性格の影響

    清水貴之(D), 春名 匠, 釜谷昌幸(原子力安全システム研究所)

    第57回材料と環境討論会講演集  2010.10 

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    Venue:沖縄自治会館  

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  • NaCl水溶液中におけるFe,Cr,Niの模擬孔食進展挙動

    春名 匠, 玉田奈津美(B), 岸本諒太(D)

    第57回材料と環境討論会講演集  2010.10 

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    Venue:沖縄自治会館  

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  • 粗粒鋭敏化SUS304鋼の環境脆化におけるき裂の発生・進展と粒界性格の関連性

    清水貴之(D), 春名 匠, 釜谷昌幸(原子力安全システム研究所)

    第147回日本金属学会2010年秋期講演大会概要集  2010.9 

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    Venue:北海道大学  

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  • AZ31マグネシウム合金の環境脆化挙動に及ぼす塩化物イオンとpHの影響

    岸本諒太(D), 春名 匠

    第147回日本金属学会2010年秋期講演大会概要集  2010.9 

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    Venue:北海道大学  

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  • フッ化物水溶液中に浸漬したTi-Ni合金の電位変化と溶出量の相関性

    雉鳥紗希(D), 春名 匠

    第147回日本金属学会2010年秋期講演大会概要集  2010.9 

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    Venue:北海道大学  

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  • SUS304鋼不働態皮膜中の結合水に及ぼす不働態化処理電位の影響

    廣瀬将己(D), 春名 匠

    第147回日本金属学会2010年秋期講演大会概要集  2010.9 

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    Venue:北海道大学  

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  • カルシウムイオンを含むメタノール溶液中でTiに生成させたカソード皮膜特性

    春名 匠, 安部翔太(B), 今川翔平(D), 金森俊和(B)

    第147回日本金属学会2010年秋期講演大会概要集  2010.9 

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    Venue:北海道大学  

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  • 超微細粒IF鋼の水素侵入速度に及ぼすARBサイクル数の影響

    石元裕貴(D), 春名 匠, 寺田大将(京都大学), 辻 伸泰(京都大学)

    第147回日本金属学会2010年秋期講演大会概要集  2010.9 

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    Venue:北海道大学  

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  • Environmentally Assisted Cracking Behavior of Super 13Cr Stainless Steel under Cathodic Polarization Condition in Carbon Dioxide Environment

    2010.9 

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    Venue:Congress Center of World Trade Center Moscow, Russia  

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  • アルミニウム(5)表面処理加工の実際,(6)腐食・防食の基礎とトラブル対策

    春名 匠

    大阪府工業協会 マテリアル入門セミナー  2010.6 

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  • 電気化学処理によるTi表面上へのカソード皮膜の形成とハイドロキシアパタイトの析出挙動

    春名 匠, 今川翔平(D), 安部翔太(B)

    第118回軽金属学会春期大会講演概要集  2010.5 

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    Venue:関西大学  

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  • フッ化物水溶液中での長時間浸漬がTi-Ni合金の耐食性に与える影響

    雉鳥紗希(D), 篠原 斎(D), 小谷昌弘(D), 奥村祐馬(B), 春名 匠

    第118回軽金属学会春期大会講演概要集  2010.5 

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    Venue:関西大学  

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  • Tiの耐孔食性に及ぼす不働態皮膜中の結合水の影響

    廣瀬将己(D), 石地寛太(B), 木許圭一郎(B), 春名 匠

    第118回軽金属学会春期大会講演概要集  2010.5 

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    Venue:関西大学  

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  • Ti-Ca合金表面上に析出するハイドロキシアパタイトの形成条件

    石元裕貴(D), 森藤健介(B), 春名 匠

    第118回軽金属学会春期大会講演概要集  2010.5 

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    Venue:関西大学  

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  • 塩化物含有環境におけるマグネシウム合金の環境脆化挙動

    岸本諒太(D), 春名 匠

    第118回軽金属学会春期大会講演概要集  2010.5 

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    Venue:関西大学  

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  • SUS304鋼の耐孔食性に及ぼす不働態皮膜中の結合水の影響

    廣瀬将己(D), 春名 匠

    第146回日本金属学会2010年春期講演大会概要集  2010.3 

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    Venue:筑波大学  

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  • H2Oを添加したCa2+/エタノール溶液中でTiに形成したカソード皮膜のハイドロキシアパタイト形成能

    春名 匠, 今川翔平(D)

    第146回日本金属学会2010年春期講演大会概要集  2010.3 

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    Venue:筑波大学  

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  • フッ化物水溶液中に長時間浸漬したTi-Ni合金の耐食性

    雉鳥紗希(B), 小谷昌弘(D), 春名 匠

    第146回日本金属学会2010年春期講演大会概要集  2010.3 

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    Venue:筑波大学  

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  • 粗粒SUS304鋼の鋭敏化ならびに環境脆化と粒界性格

    清水貴之(D), 春名 匠,, 釜谷昌幸(原子力安全システム研究所)

    第146回日本金属学会2010年春期講演大会概要集  2010.3 

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    Venue:筑波大学  

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  • AZ31マグネシウム合金の環境脆化挙動に及ぼす塩化物イオンの影響

    岸本諒太(D), 春名 匠

    第146回日本金属学会2010年春期講演大会概要集  2010.3 

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    Venue:筑波大学  

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  • 巨大ひずみ加工により作製された超微細粒IF鋼の腐食挙動

    石元裕貴(D), 中川祐一(D), 春名 匠, 辻 伸泰(京都大学)

    第146回日本金属学会2010年春期講演大会概要集  2010.3 

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    Venue:筑波大学  

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  • 巨大ひずみ加工法により作製された超微細粒IF鋼の水素脆化感受性

    春名 匠

    日本鉄鋼協会/日本金属学会九州支部総会・春季講演会概要集  2010.3 

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    Venue:九州大学  

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  • H2Oを添加したCa2+/エタノール溶液中におけるTiカソード皮膜形成挙動

    今川翔平(D), 春名 匠

    第14回関西大学先端科学技術シンポジウムポスターセッション資料集  2010.1 

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    Venue:関西大学  

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  • Tiの水素吸収挙動に及ぼすNi添加の影響

    西澤拓磨(D), 春名 匠

    第14回関西大学先端科学技術シンポジウムポスターセッション資料集  2010.1 

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    Venue:関西大学  

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  • 濃厚NaOH水溶液中における低合金鋳鋼の分極挙動に及ぼす構成元素および組織の影響

    讃岐友ノ祐(D), 春名 匠

    第14回関西大学先端科学技術シンポジウムポスターセッション資料集  2010.1 

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    Venue:関西大学  

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  • Ti-Ca合金の腐食挙動に及ぼすフッ化物イオン濃度の影響

    篠原 斎(D), 春名 匠

    第14回関西大学先端科学技術シンポジウムポスターセッション資料集  2010.1 

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    Venue:関西大学  

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  • 硫化物分散型鉛フリー青銅 JIS CAC411 の腐食挙動に及ぼす陰イオンの影響

    織田大輝(D), 丸山 徹, 小林 武, 春名 匠

    第14回関西大学先端科学技術シンポジウムポスターセッション資料集  2010.1 

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    Venue:関西大学  

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  • フッ化物水溶液中におけるTi-Ni合金の耐食性に及ぼす自然浸漬時間の影響

    雉鳥紗希(B), 篠原 斎(D), 春名 匠

    軽金属学会関西支部「若手研究者・院生による研究発表会」ポスターセッション  2010.1 

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    Venue:大阪府立大学  

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  • Ca2+を含むエタノール溶液中でTi表面に形成されるカソード皮膜の特性

    今川翔平(D), 安部翔太(B), 春名 匠

    軽金属学会関西支部「若手研究者・院生による研究発表会」ポスターセッション  2010.1 

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    Venue:大阪府立大学  

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  • Tiの不働態皮膜に含有される結合水が不働態皮膜の安定性に及ぼす影響

    石地寛太(B), 廣瀬将己(D), 春名 匠

    軽金属学会関西支部「若手研究者・院生による研究発表会」ポスターセッション  2010.1 

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    Venue:大阪府立大学  

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  • TiへのNi添加が水素吸収に及ぼす影響

    西澤拓磨(D), 春名 匠

    軽金属学会関西支部「若手研究者・院生による研究発表会」ポスターセッション  2010.1 

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    Venue:大阪府立大学  

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  • Effects of pH and Fluoride Ion Concentration on Corrosion Behavior of Ti-Ca alloy in Aqueous Fluoride Solutions

    Takumi Haruna,, Itsuki Shinohara

    18th Inter. Conf. on Processing and Fabrication of Advanced Materials (PFAMXVIII), Dec.12-24, 2009, Sendai, Miyagi  2009.12 

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    Venue:Sendai, Japan  

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  • 模擬孔食の進展挙動におよぼす塩化物イオン濃度の影響

    岸本諒太, 佐藤史健, 東慎一郎, 春名 匠

    第56回材料と環境討論会講演概要集  2009.9 

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    Venue:大阪府立大学  

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  • CO2を含有した濃厚NaCl水溶液中におけるスーパー13Crステンレス鋼の水素脆化挙動

    廣瀬将己, 春名 匠, 元家大介, 天谷 尚, 高部秀樹, 植田昌克

    第56回材料と環境討論会講演概要集  2009.9 

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    Venue:大阪府立大学  

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  • CO2を含有した濃厚NaCl水溶液中におけるスーパー13Crステンレス鋼の水素脆化挙動

    廣瀬将己,, 春名 匠,, 元家大介, 天谷 尚, 高部秀樹, 植田昌克

    第56回材料と環境討論会講演概要集  2009.9 

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    Venue:大阪府立大学  

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  • 超微細粒IF鋼の水素脆化に及ぼす焼鈍温度の影響

    春名 匠, 中川祐一, 辻 伸泰

    第56回材料と環境討論会講演概要集  2009.9 

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    Venue:大阪府立大学  

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  • Ti-Ca合金表面上に析出するハイドロキシアパタイトの形成条件

    石元裕貴, 春名 匠

    第145回日本金属学会2009年秋期講演大会概要集  2009.9 

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    Venue:京都大学  

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  • 炭酸塩水溶液中における硫化物分散型鉛フリー青銅の腐食挙動

    織田大輝, 丸山 徹, 小林 武, 春名 匠

    第145回日本金属学会2009年秋期講演大会概要集  2009.9 

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    Venue:京都大学  

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  • Tiの水素吸収に及ぼすNi添加の影響

    西澤拓磨, 春名 匠

    第145回日本金属学会2009年秋期講演大会概要集  2009.9 

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    Venue:京都大学  

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  • 粗粒SUS304鋼の鋭敏化ならびに環境脆化と粒界性格

    清水貴之, 春名 匠, 釜谷昌幸

    第145回日本金属学会2009年秋期講演大会概要集  2009.9 

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    Venue:京都大学  

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  • 濃厚NaOH水溶液中における低合金鋳鋼とその構成元素金属の腐食特性

    讃岐友ノ祐, 春名 匠, 宗宮賢治

    第145回日本金属学会2009年秋期講演大会概要集  2009.9 

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    Venue:京都大学  

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  • Ca2+を含むエタノール溶液中に添加したH2OがTiのカソード皮膜形成に及ぼす影響

    今川翔平, 春名 匠

    第145回日本金属学会2009年秋期講演大会概要集  2009.9 

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    Venue:京都大学  

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  • 窒化処理法による鉄鋼材料の耐食性向上

    春名 匠, 市井一男

    材料とプロセス  2009.9 

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    Venue:京都大学  

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  • フッ化物水溶液中におけるTi-Ca合金の耐食性に及ぼす温度の影響

    篠原 斎, 春名 匠

    第145回日本金属学会2009年秋期講演大会概要集  2009.9 

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    Venue:京都大学  

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  • Environment-Assisted Cracking Behavior of Super 13Cr Stainless Steel in Concentrated Chloride Solutions with Carbon Dioxide

    Takumi Haruna,, Yuuichi Nakagawa,, Hisashi Amaya,, Masakatsu Ueda

    Proc. of Eurocorr2009  2009.9 

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    Venue:Nice, France  

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  • Development of Titanium-Calcium Alloy Resistant to Aqueous Fluoride Solutions

    Takumi Haruna, Itsuki Shinohara

    Abstract of Thermec' 2009, Belrin, Germany  2009.8 

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    Venue:Belrin, Germany  

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  • 繰り返し重ね圧延法により作製された超微細粒IF鋼の水素脆化

    春名 匠, 中川祐一, 辻 伸泰

    材料と環境2009講演大会概要集  2009.5 

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    Venue:芝浦工業大学  

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  • Ti-Ni合金の耐食性に及ぼすフッ化物イオンの影響

    春名 匠, 小谷昌弘

    第116回軽金属学会春期講演大会  2009.5 

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    Venue:室蘭,登別  

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  • 重炭酸塩水溶液中での硫化物分散型鉛フリー青銅の腐食挙動

    織田大輝, 丸山 徹, 小林 武, 春名 匠

    第144回日本金属学会 2009年度春期講演大会概要集  2009.3 

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    Venue:東京工業大学  

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  • 低合金鋳鋼の濃厚NaOH水溶液中における腐食挙動

    讃岐友ノ祐, 宗宮賢治, 春名 匠

    関西大学MMAD研究会ポスターセッション  2009.3 

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    Venue:関西大学  

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  • 超微細粒IF鋼の環境脆化挙動に及ぼす焼鈍温度と侵入水素量の影響

    春名 匠, 中川祐一, 辻 伸泰

    第144回日本金属学会 2009年度春期講演大会概要集  2009.3 

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    Venue:東京工業大学  

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  • Tiの水素化物形成に及ぼす材料・環境因子の影響

    西澤拓磨, 藤田陽介, 春名 匠

    関西大学MMAD研究会ポスターセッション  2009.3 

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    Venue:関西大学  

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  • Ti-Ca合金の耐食性に及ぼすフッ化物イオン濃度の影響

    篠原 斎, 春名 匠

    第144回日本金属学会 2009年度春期講演大会概要集  2009.3 

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    Venue:東京工業大学  

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  • ナノ材料にもとづいた高度環境化学技術の開発プロジェクト

    岡田芳樹, 鈴木俊光, 室山勝彦, 三宅義和, 小田廣和, 三宅孝典, 越智光一, 幸塚広光, 田實佳郎, 池永直樹, 春名 匠

    関大ORDIST技苑  2009.3 

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  • Ca2+を含むエタノール溶液中におけるTiのカソード皮膜特性

    今川翔平, 犬伏啓之, 友国和樹, 春名 匠

    第144回日本金属学会 2009年度春期講演大会概要集  2009.3 

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    Venue:東京工業大学  

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  • Ti-Ca合金のフッ化物水溶液中における耐食性評価

    篠原 斎, 春名 匠

    第13回関西大学先端科学技術シンポジウムポスターセッション資料集  2009.1 

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    Venue:関西大学  

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  • フッ化物水溶液中において高耐食性を発現するTi-Ca合金の開発

    篠原 斎, 春名 匠

    軽金属学会関西支部「若手研究者・院生による研究発表会」ポスターセッション  2009.1 

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    Venue:関西大学  

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  • 繰り返し重ね圧延法により作製された超微細粒鋼の遅れ破壊特性

    中川祐一, 寺田大将, 高田尚記, 辻 伸泰, 春名 匠

    第13回関西大学先端科学技術シンポジウムポスターセッション資料集  2009.1 

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    Venue:関西大学  

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  • フッ化物水溶液中におけるTi-Ni合金の耐食機構

    小谷昌弘, 春名 匠

    軽金属学会関西支部「若手研究者・院生による研究発表会」ポスターセッション  2009.1 

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    Venue:関西大学  

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  • 低合金鋳鋼の高濃度アルカリ水溶液中における腐食挙動

    讃岐友ノ祐, 宗宮賢治, 春名 匠

    第13回関西大学先端科学技術シンポジウムポスターセッション資料集  2009.1 

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    Venue:関西大学  

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  • Ti-Ni合金のフッ化物水溶液中における耐食性評価

    小谷昌弘, 春名 匠

    第13回関西大学先端科学技術シンポジウムポスターセッション資料集  2009.1 

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    Venue:関西大学  

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  • 硫化物分散型鉛フリー青銅の硫酸塩水溶液中における耐食性評価

    織田大輝, 丸山 徹, 小林 武, 春名 匠

    第13回関西大学先端科学技術シンポジウムポスターセッション資料集  2009.1 

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    Venue:関西大学  

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  • 超微細粒鋼の力学特性と侵入水素との関連性

    春名 匠

    日本鉄鋼協会「大気腐食と水素吸収反応解析」自主フォーラム第一回研究会  2008.12 

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  • 腐食・劣化と対策について

    春名 匠

    大阪府保安対策課保安セミナー  2008.11 

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  • フッ化物水溶液中におけるTi-Mg合金の耐食性に及ぼすフッ化物イオン濃度の影響

    春名 匠, 中川祐一

    第115回軽金属学会秋期講演大会概要集  2008.11 

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    Venue:工学院大学  

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  • Effect of Hydrogen on Fracture Strain of Ultrafine Grained IF Steel Produced by Accumulative Roll-Bonding Process

    Takumi Haruna, Yuichi Nakagawa, Daisuke Tareda, Naoki Takata, Nobuyasu Tsuji

    Proc. of International Symposium on Giant Straining Process for Advanced Materials (GSAM-2008)Nov.21-24, 2008, Fukuoka, Japan  2008.11 

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    Venue:Fukuoka, Japan  

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  • Susceptibility to Hydrogen Embrittlement of Ultrafine Grained IF Steel Produced by Severe Plastic Deformation

    Takumi Haruna, Yuichi Nakagawa, Daisuke Terada, Naoki Takata, Nobuyasu Tsuji

    Extended abstract of 214th the electrochemical society, Hawaii, USA  2008.10 

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    Venue:Hawaii, USA  

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  • Characterization of Boundwater in Passive Film of Type 304 Stainless Steel Formed in H2SO4 and NaCl solutions

    Takumi Haruna, Toshiaki Sanuki, Yu Nishiuma

    Extended abstract of 214th the electrochemical society, Hawaii, USA  2008.10 

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    Venue:Hawaii, USA  

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  • Hydrogen Embrittlement Behavior of IF Steel with Ultrafine Grained Structure

    Takumi Haruna

    News Letter of Giant Straining Process for Advanced Materials Containing Ultra-High Density Lattice Defects  2008.10 

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  • Corrosion Resistance of Ti-Ni alloys in Aqueous Fluoride Solution

    Takumi Haruna, Masahiro Kotani, Yuma Okumura, Hiroyuki Takeshita, Toshio Oishi

    Extended abstract of 214th the electrochemical society, Hawaii, USA  2008.10 

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    Venue:Hawaii, USA  

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  • 濃厚NaOH溶液中における低合金鋳鋼の腐食特性

    讃岐友ノ祐, 春名 匠, 宗宮賢治

    第143回日本金属学会 2008 年度秋期講演大会概要集  2008.9 

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    Venue:熊本大学  

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  • 金属片試料の暴露試験

    小林 正, 春名 匠

    第26回電気設備学会全国大会講演論文集  2008.9 

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    Venue:愛媛大学  

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  • ステンレス鋼への不働態皮膜形成条件が結合水の存在状態に及ぼす影響

    春名 匠, 讃岐年晃, 西馬 優

    第55回材料と環境討論会講演概要集  2008.9 

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    Venue:長崎大学  

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  • 硫化物分散型鉛フリー青銅の耐食性に及ぼすpHの影響

    織田大輝, 春名 匠, 丸山 徹, 小林 武

    第143回日本金属学会 2008 年度秋期講演大会概要集  2008.9 

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    Venue:熊本大学  

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  • フッ化物水溶液中において♂耐食性を有するTi-Ca合金の開発

    篠原 斎, 春名 匠

    第143回日本金属学会 2008 年度秋期講演大会概要集  2008.9 

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    Venue:熊本大学  

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  • 巨大ひずみ法により作製された超微細粒IF鋼の♂環境脆化挙動に及ぼす焼鈍の影響

    中川祐一, 春名 匠, 寺田大将, 高田尚記, 辻 伸泰

    第143回日本金属学会 2008 年度秋期講演大会概要集  2008.9 

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    Venue:熊本大学  

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  • フッ化物水溶液中におけるTi-Ni合金の腐食におよぼす予備浸漬の影響

    小谷昌弘, 春名 匠

    第143回日本金属学会 2008 年度秋期講演大会概要集  2008.9 

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    Venue:熊本大学  

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  • 排水環境でのチタン製熱交換器電熱管の水素脆化に関する調査結果

    大西浩三, 矢野昌也, 星加貴久, 春名 匠

    材料と環境2008講演大会概要集  2008.5 

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    Venue:埼玉  

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  • 巨大ひずみ法により作製された超微細粒IF鋼の環境脆化挙動

    春名 匠, 中川祐一, 寺田大将, 高田尚記, 辻 伸泰

    文部科学省科学研究費補助金・特定領域「巨大ひずみが開拓する高密度格子欠陥新材料」平成19年度報告会報告概要集  2008.3 

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  • 超微細粒IF鋼の環境脆化に及ぼす水素の影響

    中川 祐一, 春名 匠, 寺田大将, 高田尚記, 辻 伸泰

    関西大学MMAD研究会ポスターセッション  2008.3 

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    Venue:関大  

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  • 巨大ひずみ法により作製された超微細粒IF鋼の環境脆化挙動

    春名 匠, 中川祐一, 寺田大将, 高田尚記, 辻 伸泰

    第142回日本金属学会 2008 年度春期講演大会概要集  2008.3 

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    Venue:武蔵工大  

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  • ナノ材料にもとづいた高度環境化学技術の開発プロジェクト

    岡田芳樹, 鈴木俊光, 室山勝彦, 三宅義和, 小田廣和, 三宅孝典, 越智光一, 幸塚広光, 田實佳郎, 池永直樹, 春名 匠

    関大ORDIST技苑  2008.3 

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  • フッ化物水溶液中で耐食性を示すTi合金の開発-2

    小谷昌弘, 奥村裕馬, 春名 匠

    第142回日本金属学会 2008 年度春期講演大会概要集  2008.3 

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    Venue:武蔵工大  

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  • 電気化学的に構造制御されたナノ金属酸化物薄膜被覆ステンレス鋼の耐環境遮断性向上

    春名 匠

    第12回関西大学先端科学技術推進機構シンポジウム講演集  2008.1 

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    Venue:関大  

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  • セラミック被膜の貫通欠陥評価技術

    春名 匠

    第12回関西大学先端科学技術推進機構シンポジウムポスターセッション  2008.1 

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    Venue:関大  

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  • フッ化物水溶液に対して耐食性を示すTi-Mg合金の開発

    元家大介, 春名 匠

    第12回関西大学先端科学技術推進機構シンポジウムポスターセッション  2008.1 

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    Venue:関大  

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  • 超弾性TiNi合金の環境脆化特性

    藤田陽介, 春名 匠

    第12回関西大学先端科学技術推進機構シンポジウムポスターセッション  2008.1 

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    Venue:関大  

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  • チタンに形成する水素化物の形態と水素の存在状態との関連性

    藤田陽介, 春名 匠

    軽金属学会関西支部「若手研究者・院生による研究発表会」ポスターセッション  2008.1 

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    Venue:姫路商工会議所  

    最優秀ポスター賞

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  • Effect of Hydrogen Enterance Condition on Environment-Assisted Cracking of TiAl

    Takumi Haruna

    The 260th Meeting in Committee of Corrosion and Protection in Japan Society of Materials Science  2008.1 

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  • 電気化学的に構造制御されたナノ金属酸化物薄膜被覆ステンレス鋼の耐環境遮断性向上

    春名 匠

    第12回関西大学先端科学技術シンポジウム講演集  2008.1 

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    Venue:関大  

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  • 金属材料の腐食損傷の評価法

    春名 匠

    平成19年度材料セミナーテキスト「金属材料の腐食損傷の基礎とその評価」  2007.12 

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  • 社会資本インフラ用金属材料に対する腐食防食評価技術

    春名 匠

    近畿地方整備局意見交換会  2007.10 

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  • スーパー13Crステンレス鋼の環境脆化に及ぼす塩化物イオンおよび電位の影響

    元家大介, 春名 匠, 天谷 尚

    材料と環境討論会概要集  2007.10 

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    Venue:広島  

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  • 電気化学的手法を用いてTiに吸収させた水素の存在状態解析

    藤田陽介, 春名 匠

    材料と環境討論会概要集  2007.10 

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    Venue:広島  

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  • A Study on Cracking Initiation of Stress Corrosion Cracking

    Masayuki Kamaya, Takumi Haruna, Mitsuhiro Itakura

    Proc. of International Sympo. on Research for Aging Management of Light Water Reactors  2007.10 

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    Venue:Fukui, Japan  

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  • 弱酸性フッ化物水溶液中において耐食性を示すTi合金の開発

    春名 匠

    非公開プラザ大阪モデル科学技術情報交換会(JST Innovation Bridge)  2007.9 

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  • Effect of nitrogen on the atmospheric corrosion resistance of iron and 3% Ni-advanced weathering steel

    Takumi Haruna, Kazuo Ichii

    2007.9 

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  • Comparison between TiNi and TiAl on Behavior of Evironment-Assisted Cracking

    Takumi Haruna

    2007.7 

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  • 耐食性評価

    春名 匠

    関西大学・大阪府立大学 学学連携による連続技術講座  2007.6 

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  • Development of Ti-Mg Alloys Resistant to an Aqueous Fluoride Solution

    Takumi Haruna, Daisuke Motoya, Yuichi Nakagawa, Naoji Yamashita, Toshio Oishi

    Program and Abstracts of The 11th World Conference on Titanium (Ti-2007), the International Conference Center in Kyoto, Japan, June 3-7, 2007  2007.6 

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    Venue:Kyoto, Japan  

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  • 極値統計法による腐食分布の評価

    春名 匠

    日本高圧協会 HPI-RBM研究会  2007.5 

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  • Influence of local stress on initiation of stress corrosion cracking for 304 stainless steel

    Masayuki Kamaya, Takumi Haruna

    2007.5 

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  • 弱酸性NaF水溶液中におけるTi-Mg合金の耐食性

    春名 匠, 元家大介, 山下直司, 大石敏雄

    材料と環境2007講演大会概要集  2007.5 

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    Venue:早稲田大学  

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  • Ti-Mg合金の耐食性に及ぼすフッ化物イオン濃度とpHの影響

    中川祐一, 春名 匠

    第140回日本金属学会春期講演大会概要集  2007.3 

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    Venue:千葉工大  

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  • 濃厚NaCl水溶液中におけるスーパー13Crステンレス鋼の局部腐食挙動

    元家大介, 春名 匠, 天谷 尚

    材料とプロセス  2007.3 

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    Venue:千葉工大  

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  • 電気化学的に形成させたTi水素化物の形態と水素吸収量の関係

    藤田陽介, 春名 匠

    第140回日本金属学会春期講演大会概要集  2007.3 

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    Venue:千葉工大  

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  • Results of the investigation on localized hydrogen embrittlement in wastewater condition of titanium heat exchanger tubes

    Kozo Onishi, Masaya Yano, Takahisa Hoshika, Takumi Haruna

    Corrosion/2007  2007.3 

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    Venue:Nashville, Tennessee, USA  

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  • 腐食の確率論的な見方(招待講演)

    春名 匠

    化学工学会第72年会先端化学産業技術プログラム講演要旨集  2007.3 

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    Venue:京都大  

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  • 耐食性評価

    春名 匠

    2006年度関西大学連続セミナー「ニーズに応える材料開発」  2007.2 

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  • フッ化物環境中において耐食性を有するTi-Mg合金の開発

    元家大介, 春名 匠

    軽金属学会関西支部「若手研究者・院生による研究発表会」ポスターセッション  2007.1 

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    Venue:京大会館  

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  • セラミック被膜の貫通欠陥評価技術

    春名 匠

    関西大学先端科学技術推進機構第11回シンポジウムポスターセッション  2007.1 

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    Venue:関大  

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  • フッ化物水溶液に対して耐食性を示すTi-Mg合金の開発

    元家大介, 春名 匠

    関西大学先端科学技術推進機構第11回シンポジウムポスターセッション  2007.1 

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    Venue:関大  

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  • 超弾性TiNi合金の環境脆化特性

    藤田陽介, 春名 匠

    関西大学先端科学技術推進機構第11回シンポジウムポスターセッション  2007.1 

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    Venue:関大  

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  • Evaluation methods for corrosion of metallic materials

    HTakumi Haruna

    ISIJ/JIM Kansai Branch  2006.12 

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  • Materials science toward maintenance-free processes

    Takumi Haruna

    2006.10 

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  • Degradation of Mechanical Strength of Al Alloys by Electrochemically Introduced Hydrogen

    Shinji Fujimoto, Takashi Kouno, Tomohide Tsuji, Takumi Haruna*

    Extended abstract of 210th the electrochemical society  2006.10 

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    Venue:Cancum, Mexico  

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  • Potential-pH region on environment-assisted cracking of TiNi alloy

    Yosuke Fujita, Takumi Haruna

    Proc. of 139th meeting of Japan Institute of Metals  2006.9 

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  • Future of evaluation techniques for environment-assisted cracking

    Takumi Haruna

    Proc. of Japan Institute of Electrochemical Society 2006  2006.9 

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  • Development of Ti alloy exerting corrosion resistance for NaF aqueous solution

    Daisuke Motoya, Toshio Oishi, Naoji Yamashita, Takumi Haruna

    Proc. of 139th meeting of Japan Institute of Metals  2006.9 

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  • Relationship between corrosion depth and propagation rate of localized corrosion

    Takumi Haruna, Yuji Nakamura

    Proc. of Materials and Environments 2006  2006.5 

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  • Effect of hydrogen on mechanical properties of high strength Al alloy in corrosion environment

    Shinji Fujimoto, Takashi Kohno, Tomohide Tsuji, Takumi Haruna

    Proc. of Materials and Environments 2006  2006.5 

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  • Effect of hydrogen on mechanical properties of 7000-series Al alloy in corrosion environment

    Shinji Fujimoto, Takashi Kohno, Takumi Haruna

    Proc. of 138th meeting of Japan Institute of Metals  2006.3 

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  • Application of Electrochemical Noise to Estimating Corrosion Rate of Carbon Steel in Aqueous Bicarbonate Solutions

    Takumi Haruna, Yasuyuki Morikawa, Shinji Fujimoto, Toshio Shibata

    Proc. of Core University Program between Japan and Korea on Environment Assisted Cracking and PSR, March 9-10, 2006, Seoul, Korea  2006.3 

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    Venue:Soul, Korea  

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  • Initiation-Dominant Crack Growth Model for Stress Corrosion Cracking of Sensitized Type 304 Stainless Steel

    Masayuki Kamaya, Takumi Haruna

    Proc. of JSPS-KOSEF Core University Program Seminar on Mechanisms of Environmentally Induced Material Degradation in Aged Power Plants, Jan. 11-12, 2006,Tohoku University  2006.1 

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    Venue:Sendai, Japan  

    200504-200603

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  • Development of evaluation technique for corrosion resistance of metallic materials in industry devices

    Takumi Haruna

    Kansai University ORDIST 10th Symposium Poster Session  2006.1 

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  • Evaluation techniques for corrosion damage to metallic materials

    HTakumi Haruna

    Materials seminar - Introduction in corrosion of metals and its evaluation  2005.12 

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  • SUS316L鋼の高温高圧水中応力腐食割れにおよぼす冷間加工と溶存酸素の効果のSSRTによる検討

    藤本慎司, 久保正彦, Fahmi, 中東重雄, 春名 匠

    第52回材料と環境討論会講演集  2005.9 

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    Venue:北海道大学  

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  • 7000系Al合金の機械的性質に及ぼす水素の影響

    河野 崇, 春名 匠, 藤本慎司

    第52回材料と環境討論会講演集  2005.9 

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    Venue:北海道大学  

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  • Stress Corrosion Cracking of Severely Deformed Type316 and Type316L Stainless Steels in High Temperature and High Pressure Aqueous Solution

    Shinji Fujimoto, Masahiko Kubo, Takumi Haruna, Sigeo Nakahigashi

    Proc. 16th Inter. Corros. Cong.Beijing, China, (Sep 16-19, 2005) in press  2005.9 

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    Venue:Beijing, China  

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  • 5083Al合金の機械的性質に及ぼす水素の影響

    春名 匠, 辻 智英, 藤本慎司

    第137回日本金属学会春季講演大会概要集  2005.9 

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    Venue:広島大学  

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  • SUS304ステンレス鋼箔の鋭敏化に及ぼす温度および応力の影響

    中村徹之, 春名 匠, 藤本慎司

    第137回日本金属学会春季講演大会概要集  2005.9 

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    Venue:広島大学  

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  • Hydrogen embrittlement and its evaluation technique

    Takumi Haruna, Akira Tahara

    Text of 32nd corrosion seminar  2005.7 

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  • Solution properties depending on the behavior of corrosion and cracking

    Takumi Haruna

    Text of 32nd corrosion seminar  2005.7 

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  • 高温水中における304ステンレス鋼のき裂発生モデル

    釜谷昌幸, 春名 匠

    材料と環境2005概要集  2005.5 

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    Venue:横浜  

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  • Stress corrosion cracking of Ti in lower alcoholic solutions

    Takumi Haruna

    Proc. of 243rd meeting of corrosion engineering devision, JSMS  2005.3 

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    (2005.3.15)

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  • 塩化物水溶液環境におけるAl-Mg-Mn合金の変形挙動

    辻 知英, 春名 匠, 藤本愼司

    腐食防食協会関西支部若手技術者の集い  2005.1 

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    Venue:三井化学大阪  

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  • 6061Al合金の機械的強度に及ぼす水素の影響

    河野 崇, 春名 匠, 藤本慎司

    第51回材料と環境討論会講演集  2004.9 

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    Venue:名古屋  

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  • ステンレス鋼の環境脆化マップ

    柴田俊夫, 春名 匠

    第51回材料と環境討論会講演集  2004.9 

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    Venue:名古屋  

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  • 強加工316Lステンレス鋼の高温高圧水中における応力腐食割れ挙動

    久保正彦, 春名 匠, 中東重雄, 藤本慎司

    第135回日本金属学会秋季講演大会概要集  2004.9 

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    Venue:秋田大学  

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  • 高温高圧水中における強加工316Lステンレス鋼応力腐食割れのSSRTによる評価

    藤本慎司, 久保正彦, 春名 匠, 中東重雄

    第51回材料と環境討論会講演集  2004.9 

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    Venue:名古屋  

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  • Electrochemical Conditions for Environment-Assisted Cracking of 6061 Al Alloy

    Takumi Haruna, Takashi Kouno, Shinji Fujimoto

    Abs. of Inter. Sympo. on Corrosion and Protection of Marine Structures - in Honor of the late Prof. Toshihei Misawa -, Muroran Inst. of Tech., Aug.29-31  2004.8 

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    Muroran Inst. of Tech., Aug.29-31

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  • Solution properties relating to corrosion science

    Takumi Haruna

    Text of 31st corrosion seminar  2004.7 

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  • Tiの水素侵入に対する電位およびpHの寄与

    春名 匠, 伏屋 実

    材料と環境2004講演概要集  2004.4 

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    Venue:東京  

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  • Tiの水素吸収に及ぼす電位およびpHの影響

    春名 匠, 伏屋 実

    第134回日本金属学会春季講演大会概要集  2004.4 

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    Venue:東工大  

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  • Contribution of Strain Rate to Hydrogen-Induced Cracking of γ-Titanium Aluminide in Aqueous Solutions

    Takumi Haruna, Thiyagarajan Sundararajan, Toshio Shibata

    Proc. of Core University Program between Japan and Korea on Environment Assisted Cracking and PSR,March 26-27, 2004, Seoul, Korea  2004.3 

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    Venue:Soul, Korea  

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  • 錯化剤を含む溶液中におけるAuのアノード分極挙動

    板谷和人, 春名 匠, 竹本 正, 西川 宏

    第50回材料と環境討論会講演集  2003.11 

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    Venue:琉球大学  

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  • Estimation of Corrosion Rate of Carbon Steel in Bicarbonate Aqueous Solutions by Using Electrochemical Noise

    Takumi Haruna, Yasuyuki Morikawa, Shinji Fujimoto, Toshio Shibata

    Proc. 13th Asian-Pacific Corrosion Control Conference, Osaka, Japan, (November 16-21, 2003)  2003.11 

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    Venue:Osaka, Japan  

    (November 16-21, 2003)

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  • ステンレス鋼の不働態皮膜改質技術と耐食機構

    春名 匠

    (社)日本鉄鋼協会 平成15年度鉄鋼工学アドバンスドセミナー 「表面処理コース」  2003.10 

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  • TiおよびTi合金の環境脆化マップ

    柴田俊夫, 春名 匠

    日本機械学会材料力学部門講演会(M&M 2003)講演論文集 「環境強度と微視組織」セッション  2003.9 

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    Venue:富山大学  

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  • Evaluation method for stress corrosion cracking - part2: evaluation technique of hydrogen embrittlement -

    Takumi Haruna

    Text of 30th corrosion seminar  2003.7 

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  • 人体から摘出した胸骨ワイヤーの表面観察

    塙 隆夫, 黒田大介, 角田方衛, 春名 匠, 浅見勝彦

    第132回日本金属学会春季講演大会概要集  2003.3 

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    Venue:千葉大学  

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  • ハンクス溶液中で急速変形させたTiおよびTi-6Al-4Vの電気化学挙動

    春名 匠, 浜崎雅也, 藤本慎司

    第132回日本金属学会春季講演大会概要集  2003.3 

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    Venue:千葉大学  

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  • 生体材料用Ti合金の応力腐食特性

    春名 匠, 浜崎雅也, 藤本慎司

    第131回日本金属学会秋期講演大会概要集  2002.11 

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    Venue:大阪大学  

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  • 模擬生体環境中で急速変形させたTi-6Al-4Vの溶解挙動に及ぼす電位およびpHの影響

    浜崎雅也, 春名 匠, 藤本慎司

    材料とプロセス  2002.11 

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    Venue:大阪大学  

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  • Contribution of Hydride to Environment-Assisted Cracking of Titanium Aluminide in Aqueous Solutions

    Takumi Haruna, Thiyagarajan Sundararajan, Shinji Fujimoto, Toshio Shibata

    Proc. of 15th Inter. Corr. Cong, Granada, Spain, (Sep. 22-27, 2002)  2002.9 

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    Venue:Granada, Spain  

    (Sep. 22-27, 2002)

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  • 電気化学ノイズ法を用いた重炭酸塩水溶液中における炭素鋼の腐食モニタリング

    春名 匠, 森川恭行, 藤本慎司, 柴田俊夫

    第49回材料と環境討論会講演集  2002.9 

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    Venue:姫路工大  

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  • Contribution of environmental factors to stress corrosion cracking and its explanation

    Takumi Haruna, Akira Tahara

    Text of 29th Corrosion Seminar  2002.7 

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  • Initiation and propagation of stress corrosion cracks in high temperaturewater by using direct observation system

    Takumi Haruna, Yusuke Fushiwaki

    Proc. of Aging Management and EAC Workshop in Association with Core University Program between Japan and Korea, March, 2002  2002.7 

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    March, 2002

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  • Passive film modification toward preventing stress corrosion cracking of stainless steel

    Takumi Haruna, Takeharu Nakamura, Toshio Shibata

    Proc. of 1st Inter. Conf. on Advanced Structural Steels, Tsukuba, Japan (2002.5)  2002.5 

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    Venue:Tsukuba, Japan  

    (2002.5)

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  • In-situ Observation of Stress Corrosion Cracks of Sensitized 304 Stainless Steel in High Temperature Water.

    Takumi Haruna, Shenghan Zhang, Toshio Shibata

    Proc. of 10th Conf. on Environmental Degradation of Materials in Nuclear Power System - Water Reactors, (2001.8.5-9) Lake Tahoe, NV, [NACE]  2002.5 

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    Venue:Lake Tahoe  

    (2001.8.5-9) Lake Tahoe, NV, [NACE]

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  • Electrochemical Corrosion Measurements Using Scanning Focused Light Beam

    Shinji Fujimono, Takumi Haruna, Toshio Shibata

    Proc. of 1st Inter. Conf. on Advanced Structural Steels, Tsukuba, Japan (2002.5)  2002.5 

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    Venue:Tsukuba, Japan  

    (2002.5)

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  • Effect of Temperature on Initiation and Propagation of Stress Corrosion Cracks by Direct Observation

    Takumi Haruna, Yusuke Fushiwaki, Toshio Shibata

    Proc. of International Symposium on Mechanism of Material Degradation and Non-Destructive Evaluation in Light Water Reactors (10th Anniversary of INSS), Ed. by S. Ishino, B. L. Eyre, and I. Kimura, [INSS]  2002.5 

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    Venue:Fukui, Japan  

    May 27-May 29, 2002, Osaka Japan, [INSS] (2002) pp.P8_1-4.

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  • Environment Assisted Cracking of TiAl - Thermodynamics and Electrochemical Considerations

    Thiyagarajan Sundararajan, Takumi Haruna, Shinji Fujimoto, Toshio Shibata

    Proc. of 1st Inter. Conf. on Advanced Structural Steels, Tsukuba, Japan (2002.5)  2002.5 

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    Venue:Tsukuba, Japan  

    (2002.5)

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  • In-situ observation of entry and permeation of hydrogen

    Takumi Haruna, Toshio Shibata

    Proc. of sympo. on function of hydrogen on environment-assisted cracking of structural materials -5  2002.3 

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  • Kinetics of Hydride Formation and Its Influence on the EAC Behaviour of Gamma TiAl

    Takumi Haruna, Thiyagarajan Sundararajan, Shinji Fujimoto, Toshio Shibata

    2002.3 

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  • 模擬生体環境中におけるTi-6Al-4Vの溶解・再不働態化過程

    浜崎雅也, 春名 匠, 藤本慎司

    材料とプロセス  2002.3 

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    Venue:上智大学  

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  • Surface behavior of corrosion-resistant metallic materials - semiconductive property of passive film of stainless steel and corrosion resistance of biomaterials -

    Shinji Fujimoto, Takumi Haruna, Hiroaki Tsuchiya, Masaya Hamazaki, Mayuko Sakamoto

    Proc. of COE program in 21 century, Osaka University  2002.3 

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  • Role of hydrogen to environment-assisted cracking of Ti alloys

    Takumi Haruna, Toshio Shibata

    Proc. of sympo. on function of hydrogen on structural materials -4  2002.3 

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  • 模擬原子炉環境中におけるオーステナイト鋼SCCのその場観察

    春名 匠

    (財)産業創造研究所 原子力高度技術研究会 「ライフサイクル・マネジメントに関する研究」 平成13年度第4回研究会  2002.2 

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  • Contribution of Surface Reaction to Environment-Assisted Cracking of TiAl in Aqueous Solution

    Thiyagarajan Sundararajan, Takumi Haruna, Shinji Fujimoto, Toshio Shibata

    Proc. of 2nd Inter. Conf. on Environment Sensitive Cracking and Corrosion Damage, Hiroshima, JAPAN, (2001.10.29-11.2)  2001.10 

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    Venue:Hiroshima, JAPAN  

    (2001.10.29-11.2)

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  • Stress Corrosion Cracking of Annealed Carbon Steel in Aqueous Bicarbonate Solution

    Takumi Haruna, Liehong Zhu, Toshio Shibata

    Proc of 12th Asian Pacific Corrosion Control Congress,Korea, (2001.10.8-10.14)  2001.10 

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    Venue:Korea  

    (2001.10.8-10.14)

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  • Crack detection methods in environment-assisted cracking

    HARUNA Takumi

    Proc. of 134th corrosion engineering sympo. on corrosion of metallic thin film and detection of localized corrosion  2001.9 

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  • 高温高圧水中,定荷重下における鋭敏化ステンレス鋼の応力腐食割れ直接観察

    伏脇祐介, 春名 匠, 柴田俊夫, 釜谷昌幸, 中島宣雄

    第48回材料と環境討論会講演集  2001.9 

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    Venue:北海道大学  

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  • 応力腐食割れ発生挙動と環境因子との関連性

    春名 匠

    日本原子力学会「水化学最適化研究専門委員会 「構造材-水環境相互作用(SWIS)」WG 第5回委員会  2001.5 

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  • 炭酸塩/重炭酸塩水溶液中における炭素鋼の腐食に及ぼす硫酸イオンの影響

    春名 匠, 堂本耕司, 柴田俊夫

    材料と環境2001講演概要集  2001.5 

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    Venue:産業技術総合研究所  

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  • Effect of Surface Conditions on the Environment-Assisted Cracking Behaviour or TiAl

    Tiyagarajan Sundararajan, Takumi Haruna, Shinji Fujimoto, Toshio Shibata

    2001.5 

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  • ステンレス鋼の応力腐食割れに対する環境因子の影響

    春名 匠

    関西原子力懇談会「原子力構造物の長期供用化における材料特性変化と構造物の信頼性評価委員会」 平成12年度第3回委員会  2001.3 

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  • Analysis of Stress Corrosion Cracking of Sensitized Stainless Steel in High Temperature Water by Using In-situ Observation System

    Takumi Haruna, Shenghan Zhang, Toshio Shibata

    Proc. of the Seminar of Core University Program Between Japan and Korea on Advanced Nuclear Materials, Organized by Seoul National University, CUP CR2-1 Group, and Nuclear Power Performance Management Research Centerr, (2001.3.15-3.17), in press  2001.3 

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    Venue:Soul, Korea  

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  • Ti-6Al-4Vの環境脆化に及ぼす電位およびpHの影響

    春名 匠, 浜崎雅也, 柴田俊夫

    第128回日本金属学会春季講演大会概要集  2001.3 

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    Venue:千葉工大  

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  • Development of scanning laser enhanced electrochemical microscope for detecting localized hydrogen

    Takumi Haruna, Toshio Shibata, Shinji Otsuka

    Proc. of sympo. on function of hydrogen on environment-assisted cracking of structural materials  2001.3 

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  • Role of Hydrides on the EAC Behaviour of g-TiAl

    Thiyagarajan Sundararajan, Takumi Haruna, Shinji Fujimoto, Toshio Shibata

    2001.3 

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  • ステンレス鋼の環境脆化と不働態皮膜

    春名 匠

    金属材料技術研究所第22回「耐食鋼フォーラム」  2001.2 

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  • Contribution of the Initiation Process to Stress Corrosion Cracking of Stainless Steel

    Toshio Shibata, Takumi Haruna

    Proc. of Chemistry and Electrochemistry of Corrosion and Stress Corrosion -A Sympo. Honoring the Contributions of R. W. Staehle, Ed by R. H. Jones  2001.2 

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  • Role of Surface Properties on the EAC Behaviour of Gamma TiAl

    Thiyagarajan Sundararajan, Takumi Haruna, Shinji Fujimoto, Toshio Shibata

    Proc. International Conference on Advances in Surface Science and Engineering, Feb. 21-23, 2001, Chennai, India  2001.2 

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    Venue:Chennai, India  

    Feb. 21-23, 2001

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  • Stress corrosion cracking of Ti in alcoholic solutions

    Takumi Haruna, Toshio Shibata

    Proc. of 128th corrosion engineering sympo. on the corrosion of metals in organic solvents  2000.11 

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  • 高温高圧水環境下における鋭敏化ステンレス鋼の応力腐食割れに及ぼす硫酸イオンおよびほう酸イオンの影響

    張 勝寒, 春名 匠, 柴田俊夫, 伏脇祐介

    第47回材料と環境討論会講演集  2000.11 

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    Venue:山口  

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  • 炭素鋼の腐食に伴う水素発生に及ぼすマグネタイトの影響

    伏脇祐介, 春名 匠, 柴田俊夫

    第47回材料と環境討論会講演集  2000.11 

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    Venue:山口  

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  • Electrochemical Behavior of TiAl in Sulfate Solutions at Various pH

    2000.11 

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  • Environment-assisted cracking of TiAl and its surface reaction

    Takumi Haruna, Toshio Shibata, Thiyagarajan Sundararajan

    Proc. of sympo. on function of hydrogen on environment-assisted cracking of structural materials  2000.10 

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  • Effect of Strain Rate on Environment-Assisted Cracking of TiAl in Aqueous Sulfate Solutions

    2000.10 

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  • 局部水素検出用走査型レーザー電解顕微鏡の開発-1

    大塚真司, 春名 匠, 柴田俊夫

    第127回日本金属学会秋季講演大会概要集  2000.10 

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    Venue:名古屋大  

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  • Research on the mechanism of inhibition of stress corrosion cracking by water chemistry of nuclear reactor

    Toshio SHIBATA, Takumi HARUNA, Shinji FUJIMOTO, Shenghan ZHANG

    JAERI-Tech, 2000-061  2000.10 

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  • 鋭敏化ステンレス鋼の応力腐食割れ抑制に及ぼす紫外線の効果

    春名 匠, 大西浩三, 柴田俊夫

    第127回日本金属学会秋季講演大会概要集  2000.10 

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    Venue:名古屋大  

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  • Environment-Assisted Cracking of Titanium in Alcoholic Solutions Containing Chloride

    Takumi Haruna, Masanori Yamamoto, Toshio Shibata

    Gordon Research Conference NH  2000.7 

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    Venue:NH  

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  • g-TiAlの環境脆化に及ぼす電位およびpHの影響

    春名 匠, 岩田 琢, Thiyagarajan Sundararajan, 柴田俊夫

    材料と環境2000講演概要集  2000.6 

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    Venue:横浜国大  

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  • 高温水中における鋭敏化304ステンレス鋼のIGSCCに対する温度の効果

    張 勝寒, 春名 匠, 柴田俊夫, 藤本愼司

    材料と環境2000講演概要集  2000.6 

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    Venue:横浜国大  

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  • Improvement of corrosion resistance of stainless steels by modifying passive film and its functionalization

    Toshio Shibata, Shinji Fujimoto, Takumi Haruna

    Proc. of 50th meeting in corrosion engineering division, JSMS  2000.5 

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  • Ultra-violet Light Irradiation to Sensitized Stainless Steel for Inhibiting Stress Corrosion Cracking

    Takumi Haruna, Kozo Onishi, Toshio Shibata

    Proceedings of Passivity and Localized Corrosion, ed. by M. Seo, B. MacDougall, H. Takahashi, and R. G. Kelly, [ECS]  2000.4 

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  • 高温高圧水中における鋭敏化304ステンレス鋼のき裂発生伝播挙動のその場観察

    張 勝寒, 柴田俊夫, 春名 匠

    材料とプロセス  2000.3 

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    Venue:横浜国大  

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  • Effect of Anion Species on Stress Corrosion Cracking of Sensitized 304 Stainless Steel

    Takumi Haruna, Shenghan Zhang, Toshio Shibata

    Proceedings of the Seminar of Core University Program Between Japan and Korea on Advanced Nuclear Materials, Organized by Seoul National University, CUP CR2-1 Group, and Nuclear Power Performance Management Research Center,March 20-21, 2000  2000.3 

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    March 20-21, 2000

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  • Construction of environment-assisted cracking map for TiAl

    Takumi Haruna, Toshio Shibata, Taku Iwata, Thiyagarajan Sundararajan

    Proc. of function of hydrogen on environment-assisted cracking of structural materials -2  2000.3 

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  • Passive Film Modification of Stainless Steels for Improving Corrosion Resistance

    Toshio Shibata, Shinji Fujimoto, Osamu Yamazaki, Takumi Haruna

    Proc. of the 11th Asian-Pacific Corrosion Control Conference, Vietnam  1999.11 

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    Venue:Vietnam  

    (Nov.1-5,1999)

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  • HSAB則に基づいた金属カチオンのIGSCC抑制作用の解釈

    張 勝寒, 柴田俊夫, 春名 匠

    材料とプロセス  1999.11 

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    Venue:金沢工大  

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  • 紫外線照射による鋭敏化ステンレス鋼の応力腐食割れ抑制

    大西浩三, 春名 匠, 柴田俊夫

    材料とプロセス  1999.11 

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    Venue:金沢工大  

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  • TiAlの環境脆化に対する電位-pH領域

    岩田 琢, 春名 匠, 柴田俊夫

    第125回日本金属学会秋期講演大会概要集  1999.11 

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    Venue:金沢工大  

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  • CCDカメラ付きSSRTによる応力腐食割れ解析

    柴田俊夫, 春名 匠, 張 勝寒

    第125回日本金属学会秋期講演大会概要集  1999.11 

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    Venue:金沢工大  

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  • 塩化物イオンを含む低級アルコール溶液中におけるTiの環境脆化

    山本雅則, 春名 匠, 柴田俊夫

    第125回日本金属学会秋期講演大会概要集  1999.11 

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    Venue:金沢工大  

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  • Ultra-violet Light Irradiation to Sensitized Stainless Steel for Inhibiting Stress Corrosion Cracking

    Takumi Haruna, Kozo Onishi, Toshio Shibata

    Meeting Abstract of 196th Electrochemical Society Meeting, [ECS]  1999.10 

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    Venue:Hawaii, USA  

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  • Contribution of Anion Hardness and Buffer Capacity to Control IGSCC Initiation of Sensitized Type 304 Stainless Steel

    Toshio Shibata, Shenghan Zhang, Takumi Haruna

    Proc. of 14th Inter. Corr. Cong..(1999.9.26-10.1),, Cape Town, South Africa  1999.9 

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    Venue:South Africa  

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  • 重炭酸塩水溶液中における炭素鋼の腐食に伴う水素発生

    春名 匠, 村上 真, 柴田俊夫

    第46回材料と環境討論会講演集  1999.9 

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    Venue:九州産大  

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  • Suppressing Effect of Metal Cation on Stress Corrosion Cracking of Sensitized Type 304 Stainless Steel

    Shenghan Zhang, Toshio Shibata, Takumi Haruna

    Meeting Abstracts of 195th Electrochemical Society Meeting,[ECS], Seatle, WA  1999.5 

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    Venue:Seatle, WA, USA  

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  • 熱処理された炭素鋼の応力腐食割れに及ぼす重炭酸塩濃度の影響

    春名 匠, 村上 真, 柴田俊夫

    材料と環境'99講演集  1999.5 

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    Venue:千葉工業大学  

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  • Environmental degradation map of Ti in methanol solutions containing chloride ions

    Toshio Shibata, Takumi Haruna, Yasunori Yamamoto

    Proc. of function of hydrogen for environment-assisted cracking of structural materials  1999.3 

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  • メタノール/塩化物溶液中におけるチタンの電気化学挙動

    春名 匠, 山本雅則, 柴田俊夫

    第124回日本金属学会春期講演大会概要集  1999.3 

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    Venue:千葉工業大学  

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  • ステンレス鋼応力腐食割れ抑制へのHSAB則の適用

    柴田俊夫, 張 勝寒, 春名 匠

    第66回電気化学会講演要旨集  1999.3 

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    Venue:横浜国立大学  

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  • Competition between Inhibition and Acceleration by Anions to IGSCC of Sensitized Type 304 Stainless Steel

    Shenghan Zhang, Toshio Shibata, Takumi Haruna

    Proc. of Water Chemistry '98 [JAIF]  1998.10 

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    Venue:Niigata, Japan  

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  • Inhibition Effect of Zn2+ on IGSCC of Sensitized 304 Stainless Steel

    Takumi Haruna, Shenghan Zhang, Toshio Shibata, Yoshihiko Tanaka

    Proc. of Water Chemistry '98 [JAIF]  1998.10 

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    Venue:Niigata, Japan  

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  • 鋭敏化304ステンレス鋼のIGSCC発生抑制に対するHSAB則の適用

    張 勝寒, 柴田俊夫, 春名 匠

    材料とプロセス  1998.9 

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    Venue:愛媛大学  

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  • 鋭敏化304ステンレス鋼のき裂発生・伝播に対する溶液pHの効果

    張 勝寒, 柴田俊夫, 春名 匠

    第45回材料と環境討論会講演集  1998.8 

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    Venue:金沢工業大学  

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  • 塩化物イオンを含むメタノール溶液中におけるチタンの応力腐食割れ

    山本雅則, 春名 匠, 柴田俊夫

    第45回材料と環境討論会講演集  1998.8 

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    Venue:金沢工業大学  

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  • Effect of Anion Impurities on IGSCC of Sensitized Type 304 Stainless Steel

    Toshio Shibata, Shenghan Zhang, Takumi Haruna

    1998 Gordon Research Conference on Aqueous Corrosion, New London, NH  1998.7 

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    Venue:New London, NH  

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  • Stress Corrosion Cracking of Heat Treated Mild Steel in Bicarbonate Solution

    Takumi Haruna, Liehong Zhu, Toshio Shibata

    1998 Gordon Research Conference on Aqueous Corrosion, New London, NH  1998.7 

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    Venue:New London, NH  

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  • 鋭敏化304ステンレス鋼の応力腐食割れの発生と伝播に対する環境因子の効果

    張 勝寒, 柴田俊夫, 春名 匠

    材料と環境'98講演集  1998.5 

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    Venue:早稲田大学  

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  • Analysis of initiation and propagation of stress corrosion cracking using slow strain rate testing apparatus with widely-scanning CCD camera system

    Takumi Haruna, Toshio Shibata

    Proc. of 204th corrosion engineering devision meeting in JSMS  1998.5 

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  • 熱処理された炭素鋼の重炭酸塩水溶液中における応力腐食割れ

    春名 匠, 朱 列紅, 柴田俊夫

    材料と環境'98講演集  1998.5 

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    Venue:早稲田大学  

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  • き裂の発生・成長挙動から見たステンレス鋼の応力腐食割れに及ぼすひずみ速度の影響

    春名 匠, 柴田俊夫

    第75期日本機械学会通常総会講演会講演論文集(II)  1998.3 

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    Venue:東京工業大学  

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  • 炭酸塩/重炭酸塩水溶液環境における炭素鋼の環境強度劣化

    柴田俊夫, 朱 列紅, 春名 匠

    第122回日本金属学会講演大会概要集  1998.3 

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    Venue:工学院大学  

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  • 鋭敏化304ステンレス鋼の応力腐食割れに対するH3BO3の影響

    張 勝寒, 柴田俊夫, 春名 匠

    第122回日本金属学会講演大会概要集  1998.3 

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    Venue:工学院大学  

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  • Effect of kind of anion on initiation and propagation of stress corrosion cracks for sensitized 304 stainless steel

    Shenghan Zhang, Toshio Shibata, Takumi Haruna

    Proc. of 203th corrosion engineering devision meeting in JSMS  1998.3 

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  • PDMモデルによる不働態皮膜破壊および添加元素効果

    春名 匠

    日本鉄鋼協会 材料の組織と特性部会「ステンレス鋼の耐候性試験」自主フォーラム研究会  1997.12 

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  • Effect of CaCl2 Concentration on the Initiation and the Propagation of SCC for Type 304 Stainless Steel

    Toshio Shibata, Takumi Haruna, Tomohisa Taniguchi

    The 10th Asia Pacific Corrosion Control Conference Bali, Indonesia  1997.10 

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    Venue:Bali, Indonesia  

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  • Role of Borate Ion to Suppress Stress Corrosion Cracking of Sensitized Type 304 Stainless Steel

    Shenghan Zhang, Toshio Shibata, Takumi Haruna

    Proc. Eurocorr '97, Norway  1997.9 

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    Venue:Norway  

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  • 鋭敏化304ステンレス鋼の応力腐食割れに対する抑制因子(B4O72-)と加速因子(SO42-)の競合

    張 勝寒, 柴田俊夫, 春名 匠

    第44回材料と環境討論会講演集  1997.9 

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    Venue:東北大学  

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  • SM400B炭素鋼のHCO3-水溶液中におけるSCC発生条件

    柴田俊夫, 朱 列紅, 春名 匠

    第44回材料と環境討論会講演集  1997.9 

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    Venue:東北大学  

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  • 鋭敏化SUS 304ステンレス鋼のほう酸イオン溶液中でのIGSCC挙動

    張 勝寒, 柴田俊夫, 春名 匠

    材料と環境'97講演集  1997.5 

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    Venue:北トピア,東京  

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  • Point Defect Modelから見た不働態皮膜の破壊

    春名 匠

    日本鉄鋼協会 材料の組織と特性部会「ステンレス鋼の耐候性試験」自主フォーラム研究会  1997.4 

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  • 鋭敏化SUS304ステンレス鋼のIGSCCに対するほう酸イオンの抑制作用

    張 勝寒, 柴田俊夫, 春名 匠

    第120回日本金属学会講演大会概要集  1997.3 

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    Venue:東京理科大学  

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  • Evaluation for corrosion resistance of metals -III. stress corrosion cracking

    Toshio Shibata, Shinji Fujimoto, Takumi Haruna

    Text of 'seminar for materials'  1996.11 

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  • Effect of Thiosulfate Ions on the Stress Corrosion Cracking of Type 304 Stainless Steel

    Toshio Shibata, Rui Toyota, Takumi Haruna

    Proc. of 13th Inter. Corros. Conf., [Australian Corrosion Association]  1996.11 

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    Venue:Australia  

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  • Initiation and propagation of stress corrosion cracks for sensitized 304 stainless steel in sodium sulfate solutions

    Shenghan Zhang, Toshio Shibata, Takumi Haruna

    Abstract of meeting in Institute of Materials Research  1996.11 

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  • 鋭敏化SUS304鋼のIGSCCに及ぼす硫酸イオンの影響

    張 勝寒, 柴田俊夫, 春名 匠

    第43回腐食防食討論会講演集  1996.10 

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    Venue:大阪大学  

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  • Point Defect Modelによる孔食発生誘導期間の確率分布の予測

    春名 匠, D. D. Macdonald

    第43回腐食防食討論会講演集  1996.10 

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    Venue:大阪大学  

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  • 鋭敏化304ステンレス鋼応力腐食割れの発生と伝播

    張 勝寒, 柴田俊夫, 春名 匠

    材料とプロセス  1996.9 

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    Venue:北海道大学  

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  • Point Defect Modelによる孔食電位の電位掃引速度依存性の予測

    春名 匠, D. D. Macdonald

    第119回日本金属学会講演概要集  1996.9 

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    Venue:北海道大学  

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  • Scan Rate Dependence of the Pitting Potential and Probability Distribution in Induction Time for Pitting on the Basis of the Point Defect Model

    Takumi Haruna, Digby D. Macdonald

    Proc. Of Critical Factors in Localized Corrosion II, Ed. by P. M. Natishan, R. G. Kelly, G. S. Frankel and R. C. Newman, [ECS], Chicago, IL  1996.4 

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    Venue:Chicago, IL., USA  

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  • Scan Rate Dependence of the Pitting Potential and Probability Distribution in Induction Time for Pitting on the Basis of the Point Defect Model

    Takumi Haruna, Digby D. Macdonald

    Ext. Abstract of 188th Electrochemical Society Meeting, [ECS], Chicago, IL.  1995.10 

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    Venue:Chicago, IL., USA  

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  • Numerical Simulation for the Segregation of Alloying Elements in Passive Systems

    Takumi Haruna, Lei Zhang, Digby D.Macdonald

    The DOE/BES Contractors Meetings  1995.9 

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  • Improvement of the SCC Resistance of Type304 Stainless Steel by the Passivation Treatment

    Toshio Shibata, Takumi Haruna, Takeharu Nakamura

    Proc. of Inter. Sympo. On Plant Aging and Life Prediction of Corrodible Structures, [JSCE] Sapporo  1995.5 

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    Venue:Sapporo, Japan  

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  • Effect of Anions on Stress Corrosion Cracking of Stainless Steels

    Toshio Shibata, Eiji Kikuchi, Takumi Haruna

    Proc. of Seminar on Water Chemistry of Nuclear Reactor System '95  1995.4 

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    Venue:Niigata, Japan  

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  • Detection of defects in TiN coating film on steels using scanning laser enhanced electrochemical microscope

    Toshio Shibata, Takumi Haruna

    Proc. of surface modification for steels by PVD coating  1995.3 

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  • Electrochemical properties of SUS 304 stainless steel coated with TiN film in acidic solution

    Toshio Shibata, Takumi Haruna

    Proc. of surface modification for steels by PVD coating  1995.3 

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  • 走査レーザー電解顕微鏡の特性と応用

    柴田俊夫, 藤本愼司, 春名 匠, 庄野友陵, 宇高茂晴, P. D. Green

    材料とプロセス  1994.10 

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    Venue:九州大学  

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  • チオ硫酸イオン含有塩化物水溶液中におけるType304L鋼の応力腐食割れに及ぼす電位の影響

    春名 匠, 柴田俊夫, 豊田 類

    第41回腐食防食討論会講演集  1994.10 

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    Venue:愛媛大学  

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  • 濃厚塩化カルシウム水溶液中におけるType304鋼の腐食特性

    柴田俊夫, 谷口智久, 春名 匠

    第115回日本金属学会講演概要集  1994.10 

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    Venue:九州大学  

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  • Development of scanning laser enhanced electrochemical microscope and evaluation of corrosion resistance of the materials for fusion reactor

    Toshio Shibata, Shinji Fujimoto, Takumi Haruna, Peter D. Green

    Proc. of Sympo. in Institute of laser engineering  1994.7 

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  • Initiation and Growth of Stress Corrosion Cracks of Type 316L Stainless Steel during Slow Strain Rate Testing.

    Takumi Haruna, Toshio Shibata

    Proc. of Asian Sympo. on Corrosion and Protection in Oil and Gas Operations, Oil Refineries, and Petrochemical Industries[JSME], Osaka  1994.6 

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    Venue:Osaka, Japan  

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  • Type304鋼の応力腐食割れに及ぼす不働態化前処理電位の影響

    春名 匠, 中村武治, 柴田俊夫

    腐食防食'94講演集  1994.5 

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    Venue:工業技術院物質工学工業技術研究所  

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  • 酸性溶液中におけるTiNコーティングSUS304鋼の電気化学的特性

    柴田俊夫, 春名 匠

    材料とプロセス  1994.3 

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    Venue:東京工業大学  

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  • アルカリ溶液中におけるインコネル600合金鋳造材の粒界腐食

    柴田俊夫, 春名 匠, 立石和幸

    第113回日本金属学会講演概要集  1993.10 

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    Venue:名古屋工業大学  

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  • Application of scanning laser enhanced electrochemical microscope (SLEEM) to corrosion evaluation

    Toshio Shibata, Shinji Fujimoto, Takumi Haruna

    Proc. of 176th meeting of corrosion engineering division in Japan Society of Materials Science  1993.9 

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  • Crack Initiation and Growth of Sensitized Type304 Stainless Steel in NaF Solution

    Toshio Shibata, Takumi Haruna, Takahiro Oki

    Proc. of 12th Inter. Corros. Conf.,Houston, TX, USA [NACE]  1993.9 

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    Venue:Houston, TX, USA  

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  • Electrochemical properties of type 304 stainless steel in fluoride solutions

    Takumi Haruna, Toshio Shibata, Takahiro Oki

    Proc. of 96th Sympo. of Corrosion Engineering  1993.9 

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  • Stress corrosion cracking of type 304 stainless steel in fluoride solutions

    Takumi Haruna, Toshio Shibata

    Proc. of 96th Sympo. of Corrosion Engineering  1993.9 

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  • CaCl2水溶液中におけるType304鋼応力腐食割れの発生と進展

    柴田俊夫, 谷口智久, 春名 匠

    腐食防食'93講演集  1993.5 

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    Venue:東京北とぴあ  

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  • SUS304鋼に被覆したTiN膜の欠陥評価

    柴田俊夫, 春名 匠

    第112回日本金属学会講演概要集  1993.3 

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    Venue:横浜国立大学  

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  • Stress corrosion cracking of stainless steels in fluoride solutions

    Toshio Shibata, Takumi Haruna, Takahiro Oki

    Proc. of the meeting in MRI  1992.11 

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  • Fe基非晶質合金の孔食発生確率過程におよぼす熱処理の影響

    柴田俊夫, 猪原康人, 春名 匠

    第39回腐食防食討論会講演集  1992.10 

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    Venue:名古屋大学  

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  • インコネル600合金鋳造材の粒界腐食の電位依存性

    柴田俊夫, 春名 匠, 小島 通

    第111回日本金属学会講演概要集  1992.10 

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    Venue:富山大学  

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  • An Alternative Test Method for Evaluating the Sour Gas Resistance of Low-Alloy Steels and CRAs

    S.Tsujikawa, A.Miyasaka, M.Ueda, S.ando, T.Shibata, T.Haruna, M.Katahira, Y.Yamane, T.Aoki, T.Yamada

    Corrosion 92  1992.9 

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    Venue:Nashville, Tennessee, USA  

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  • NaF水溶液中の鋭敏化304鋼における応力腐食割れの発生と成長

    柴田俊夫, 春名 匠, 沖 孝広

    腐食防食'92講演集  1992.4 

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    Venue:アルカディア市ヶ谷(東京)  

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  • 低ひずみ速度試験中における応力腐食き裂の発生・成長に対する温度の影響

    柴田俊夫, 春名 匠

    第110回日本金属学会講演概要集  1992.4 

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    Venue:千葉工業大学  

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  • Slow Strain Rate Technique for Analyzing KISCC and Crack Growth Rate of Stainless Steels.

    Toshio Shibata, Takumi Haruna

    Ext. Abstract of 1992 Research in Progress Sympo.[NACE], Nashville, Tennessee  1992.4 

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    Venue:Nashville, Tennessee, USA  

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  • 鋭敏化SUS304鋼の応力腐食割れにおけるき裂の成長に及ぼすNaF濃度の影響

    柴田俊夫, 春名 匠, 沖 孝広

    材料とプロセス  1992.4 

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    Venue:千葉工業大学  

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  • Stress corrosion cracking of stainless steels in chloride solutions containing thiosulfate ion using slow strain rate technique

    Takumi Haruna, Toshio Shibata

    Proc. of corrosion engineering of Japan Society for Materials Science  1992.3 

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  • Evaluation of susceptibility to stress corrosion cracking of stainless steels in NaCl + Na2S2O3 solutions using SSRT

    Toshio Shibata, Takumi Haruna

    Proc. of Sympo. on evaluation of susceptibility to stress corrosion cracking of ferritic materials in wet environment containing hydrogen sulfide  1991.12 

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  • SSRTによるNaF溶液中の鋭敏化304ステンレス鋼の応力腐食割れ

    柴田俊夫, 沖 孝広, 春名 匠

    第38回腐食防食討論会講演集  1991.10 

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    Venue:九州工業大学  

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  • 低ひずみ速度試験による応力腐食割れき裂の破壊力学的評価

    柴田俊夫, 春名 匠

    第38回腐食防食討論会講演集  1991.10 

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    Venue:九州工業大学  

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  • Stress Corrosion Cracking of Type316L Stainless Steel in NaCl Solutions Containing Thiosulfate.

    Toshio Shibata, Takumi Haruna, Shinji Fujimoto

    Proc. of Inter. Conf. on Stainless Steels[ISIJ] Chiba, Japan.  1991.6 

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    Venue:Chiba, Japan  

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  • Investigation on mechanism for stress corrosion cracking of 316L stainless steel in concentrated chloride solution containing S2O32-

    Toshio Shibata, Takumi Haruna

    Proc. of sympo. of corrosion engineering on corrosion evaluation medium containing alternative to hydrogen sulfide  1991.5 

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  • 低ひずみ速度試験法におけるステンレス鋼の応力腐食割れ伝播挙動

    柴田俊夫, 春名 匠

    材料とプロセス  1991.4 

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    Venue:東京大学  

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  • (S2O32-+Cl-)水溶液中におけるType316L鋼SCCの電気化学的条件

    柴田俊夫, 春名 匠

    第37回腐食防食討論会講演集  1990.8 

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    Venue:信州大学  

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  • SSRTによるSUS316L鋼のSCCに対する電位の影響

    柴田俊夫, 春名 匠, 藤本慎司

    材料とプロセス  1990.4 

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    Venue:東京工業大学  

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  • チオ硫酸イオンを含む塩化物水溶液中におけるSUS316L鋼の低ひずみ速度試験

    柴田俊夫, 春名 匠, 藤本慎司, 中根慎介

    材料とプロセス  1989.10 

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    Venue:北海道大学  

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  • Sn-Pb合金の超塑性変形における粒界すべり速度

    春名 匠, 古城紀雄, 堀 茂徳

    第104回日本金属学会講演概要集  1989.4 

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    Venue:横浜国立大学  

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  • 超塑性変形における粒界すべりと粒界性格の関連

    春名 匠, 柴柳敏哉, 古城紀雄, 堀 茂徳

    第103回日本金属学会講演概要集  1988.11 

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    Venue:大阪大学  

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  • 304ステンレス鋼溶接部への走査振動電極法の適用

    柴田俊夫, 春名 匠, 藤本慎司

    第34回腐食防食討論会  1987.10 

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    Venue:大阪なにわ会館  

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Industrial property rights

  • Titanium-Nickel Alloys for Dental Parts

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    Application no:特願2008-77683  Date applied:2008.3

    Announcement no:特開2009-228093  Date announced:2009.10

    Patent/Registration no:5171336  Date registered:2013.1  Date issued:2013.1

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  • Titanium Alloys Containing 1A or 2A Group Metal

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    Application no:特願2006-234166  Date applied:2006.8

    Announcement no:特開2008-81751  Date announced:2008.4

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Awards

  • 論文賞

    2020.5   (社)腐食防食学会  

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    Country:Japan

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  • 2018年学術功労賞

    2018.5   (社)腐食防食学会  

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    Country:Japan

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  • 第18回優秀技術活動賞 技術報告賞

    2015.4   電気学会  

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    Country:Japan

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  • 産学連携賞

    2014.5   関西大学科学技術振興会  

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    Country:Japan

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  • 功績賞

    2012.1   (社)軽金属学会関西支部  

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    Country:Japan

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  • Best Poster Award

    2009.12   18th Inter. Conf. on Processing and Fabrication of Advanced Materials  

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  • 進歩賞

    1993.5   (社)腐食防食協会  

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    Country:Japan

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Research Projects

  • 日本鉄鋼協会 研究会 (研究分担者)

    2020 - 2022

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  • Understanding for mechanism of hydrogen embrittlement using a scanning blue-laser-enhanced electrochemical microscope for hydrogen detection

    Grant number:18K04784  2018.4 - 2021.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

    HARUNA Takumi

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    Grant amount:\3380000 ( Direct Cost: \2600000 、 Indirect Cost:\780000 )

    Scanning Blue-Laser-Enhanced Electrochemical Microscope for Hydrogen detection (H-SBLEEM) was tried to be developed in this research in order to detect hydrogen diffusing in a steel. The system consisted of a optical microscope, an oscillator of semiconductor blue laser, an electrically-controlled X-Y stage, two small cells for electrochemical hydrogen permeation test. It was realized that an effective position resolution was 0.03 mm and a hydrogen flux at the tiny laser spot was able to be quantified. As Fe plate was subjected to the system, it was revealed that the surface without Ni-plated is more sensitive to hydrogen detection than the Ni-plated surface. Moreover, it was found that a hydrogen flux was larger inside a grain and almost no hydrogen was detected at a grain boundary.

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  • 日本鉄鋼協会 研究会 (研究代表者)

    2018 - 2020

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  • 日本鉄鋼協会 研究会 (研究分担者)

    2018 - 2020

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  • 科学研究費補助金 基板研究(C) (研究代表者)

    2018 - 2020

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  • 原子力安全研究協会 公募研究 (研究代表者)

    2013 - 2020

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  • 軽金属奨学会 統合的先端研究 (研究分担者)

    2013 - 2015

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  • 日本鉄鋼協会 研究会 (研究分担者)

    2013 - 2015

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  • 軽金属奨学会 研究補助金助成 (研究代表者)

    2010

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  • 科学研究費補助金 挑戦的萌芽研究 (研究代表者)

    2009 - 2011

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  • Development of Ca-condensated film deposited on Ti in alcoholic solutions containing Ca ions

    Grant number:21656191  2009 - 2011

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Challenging Exploratory Research

    HARUNA Takumi

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    Grant amount:\2600000 ( Direct Cost: \2300000 、 Indirect Cost:\300000 )

    Our research group has been tried to develop the technique for preparation of the film accelerating the formation of hydroxyapatite. The technique bases on the electrochemical treatment to Ti in alcoholic solution containing Ca^<2+>. In this study, we have investigated the characteristics of the film depending on various environmental factors in preparing(temperature and concentrations of CaCl_2 and H_2 O) and the understand in optimum film conditions promoting the formation of hydroxyapatite.

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  • 軽金属奨学会 研究補助金助成 (研究代表者)

    2009

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  • 巨大ひずみ加工により作製される超微細粒材料の水素脆化挙動

    Grant number:19025011  2007 - 2008

    日本学術振興会  科学研究費助成事業  特定領域研究

    春名 匠

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    Grant amount:\4000000 ( Direct Cost: \4000000 )

    極低炭素IF鋼は, ARB(Accumulative Roll Bonding)法により結晶粒径を1μm以下にして, 引張強度を出発材の約3倍に増加させることが可能である. しかし, 一般的に, 鉄鋼材料は強度レベルの上昇とともに, 外部環境中から材料内部に侵入する水素が関与する「遅れ破壊」と呼ばれる脆性破壊を, 極めて低い応力レベルで起こすことが知られており, 上記超微細粒鋼での発現が懸念されている. したがって, 本研究では超微細粒材料の環境脆化と侵入水素量との関連性を明らかにするとともに, 水素による脆性破壊の機構も解明していくことを目的として研究を行った.
    5サイクルARB焼鈍材に86.4ks水素チャージを行うと, 焼鈍温度の増加にともなって侵入水素量が減少した. また, 引張試験の結果から破断ひずみ比は焼鈍温度の増加にともなって増加し, 773K以上の焼鈍により約0.8まで回復した. とくに, 5サイクルARB材の結晶粒内の欠陥の回復が起こる焼鈍温度範囲で破断ひずみ比が著しく増加したことから, 結晶粒内の欠陥に捕捉された水素が水素脆化に著しく関与すると考えられる. 773Kの温度で焼鈍を行った5サイクルARB材の引張強度は5サイクルARB材の引張強度より減少するが, 出発材の引張強度の約2.3倍に相当する680MPaに達する. したがって, 5サイクルARB材は侵入水素により水素脆化感受性は増加するが, 773Kの温度で焼鈍を行うと超微細粒鋼としての引張強度を保持したまま水素脆化を起こしにくい材料になることが明らかになった.

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  • Development of Ti alloys for dental materials resistant to fluoride environment

    Grant number:19560712  2007 - 2008

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

    HARUNA Takumi

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    Grant amount:\2990000 ( Direct Cost: \2300000 、 Indirect Cost:\690000 )

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  • 科学研究費補助金 基板研究(C) (研究代表者)

    2007 - 2008

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  • 科学研究費補助金 特定領域研究(公募) (研究代表者)

    2007 - 2008

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  • 科学研究費補助金 基盤研究(B) (研究分担者)

    2005 - 2007

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  • Surface modification for Bio-Metallic Materials for Prevention of Harmful ion Dissolution under Dynamic loading

    Grant number:17360342  2005 - 2007

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    FUJIMOTO Shinji, HARUNA Takumi

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    Grant amount:\15500000 ( Direct Cost: \14600000 、 Indirect Cost:\900000 )

    The bio compatibility of metallic biomaterials are characterized electrochemically using conventional polarization measurements under cell culturing condition, a rapid straining electrode technique. The surface modification of metallic materials including stainless steels, Ni-Ti alloy, Ti and its alloys with oxide formation and also electroconductive polymers.
    The electrochemical corrosion behavior of Type 304 and 316L stainless steels was studied in Hanks' solution, Eagle's Minimum Essential Medium (MEM), serum containing medium (MEM with 10% of fetal bovine serum) without cells, and serum containing medium with cells over a one-week period. Polarization resistance measurements indicated that the stainless steels were resistant to Hanks' and MEM solutions. Type 304 was more inferior to pitting corrosion than Type 316L in Hanks' and MEM solutions. The uniform corrosion resistance of stainless steels, determined by R_p, was lower in culturing medium than in Hanks' and MEM. The low corrosion resistance was due to surface passive film with less protective to reveal high anodic dissolution rate. When cells were present, the initial corrosion resistance was low; but gradually increased after three days, consistent with the trend of cell coverage. The presence of cell was found to suppress the cathodic reaction, that is, oxygen reduction, and increase the uniform corrosion resistance as a consequence. On the other hand, both Type 304 and 316L stainless steels become more susceptible to pitting corrosion when they were covered with cells.
    Ti and Ti based alloys are characterized by a continuous electrochemical monitoring and a rapid straining electrode technique in simulated body fluid environment. Materials examined are Ti, Ti-6AI-7Nb, Ti-6AI-4V and Ti-29Nb-13Ta-4.6Zr. Sterilized specimens were immersed in Hanks solution or Eagle's minimum essential medium (MEM) solution. Electrode potential and polarization resistance were simultaneously and continuously measured up to 7 days. For all the specimens examined, the corrosion potential reached to a steady state in 2 days for both solutions. On the other hand, corrosion resistance increased monotonously for the period examined.

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  • Improvement of resistance to environment-assisted cracking of high strength aluminum alloys for the next generation

    Grant number:16560612  2004 - 2005

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

    HARUNA Takumi, FUJIMOTO Shinji

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    Grant amount:\2100000 ( Direct Cost: \2100000 )

    We have investigated environment-assisted cracking (EAC) and hydrogen absorption of Al-Mg-Mn (5083) alloys in 0.1 M chloride solutions of pHs 1,3, and 7 at 25℃. We employed a slow strain rate EAC testing apparatus and a thermal desorption gas analyzer (TDA).
    The following results were obtained from the EAC tests : (1)Under a potential over a film-breakdown potential of about -740 mV_<Ag/AgCl>, a fracture strain in the solution of any pH was smaller than that obtained in the inert (air) condition. In addition, the fracture strain decreased with lowering pH. (2)Under a cathodic potential of -1000 mV_<Ag/AgCl>, the fracture strain obtained in the solution of any pH was almost the same as that in the inert condition. (3)At -1500 mV_<Ag/AgCl>, the fracture strain in the solution of pH 1 was almost the same as, and those in the solutions of pH 3 and 7 were smaller than that in the inert condition.
    The following results were obtained from the TDA tests : (4)Under a potential over the film-breakdown potential, remarkable hydrogen absorption was not detected in the solution of any pH. (5)In the solution of pH 1, remarkable hydrogen absorption was not detected in the cathodic potential region to -1500 mV_<Ag/AgCl>. Besides, the amount of hydrogen absorption in the solutions of pHs 3 and 7 slightly increased with lowering potential. Further, the amount of hydrogen absorption increased with an increase in pH.
    In comparison with Al-Mg-Si (6061) alloy investigated last year, it is found that this Al-Mg-Mn alloy is hard to absorb hydrogen in any potential condition, and slight hydrogen absorption may relate to decrease in fracture strain. Finally, it is suggested in the whole research that both the materials avoid strength-degradation related to environment when the materials are used as their electrochemical potentials are maintained around -1000 mV_<Ag/AgCl>

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  • 科学研究費補助金 基板研究(C) (研究代表者)

    2004 - 2005

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  • (社)大阪大学工業会 平成16年度上期海外交流助成金

    2004

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  • 先進材料の微小環境における環境劣化挙動

    Grant number:15656186  2003 - 2004

    日本学術振興会  科学研究費助成事業  萌芽研究

    藤本 慎司, 春名 匠

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    Grant amount:\2500000 ( Direct Cost: \2500000 )

    微小な材料として、薄膜の腐食挙動を検討した。厚さ50mμ〜0.2mmのSUS304ステンレス製鋼板4種類を熱処理することによって組織制御し、サイズが微小になることにともなう腐食挙動の変化を検討した。1200K,86.4ksの溶体化焼鈍により結晶粒を成長させることによって、板厚方向に結晶粒がひとつしかない構造"Bamboo structure"を作ることができた。この材料を用いて、鋭敏化挙動に及ぼす応力の効果を検討した。
    (1)鋭敏化挙動はバルク材と比べて速度が速いことを除き、粒界および粒内での炭化物析出形態は、同様であった。
    (2)923K,973Kおよび1023Kでの鋭敏化で、鋭敏化度は時間とともに増大しピークを示した後、減少した。特に、ピークを示す時間は973Kおよび973Kでバルク材よりも急速であった。
    (3)鋭敏化熱処理時に引っ張り応力を与えると、鋭敏化度は低下することが明らかとなった。
    (4)鋭敏化熱処理時に引っ張り応力を与えた場合の応力軸に対する粒界の角度-傾角-と鋭敏化度との相関を検討した。傾角の増大かつ応力が大きくともなって炭化物析出の幅が大きくなることがわかった。これは、応力の負荷によって炭素の拡散が促進され、特に粒界で特に顕著なため大傾角での鋭敏化が特に促進されたことがわかった。
    以上のように、薄い板材における腐食挙動を検討することによって、結晶粒界の性格と炭化物析出ならびにそれにともなう腐食挙動の変化について、検討することができた。

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  • 科学研究費補助金 萌芽研究 (研究分担者)

    2003 - 2004

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  • 科学研究費補助金 若手研究(B) (研究代表者)

    2001 - 2002

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  • 電気化学的手法による高強度金属間化合物の室温高延性発現

    Grant number:13750673  2001 - 2002

    日本学術振興会  科学研究費助成事業  若手研究(B)

    春名 匠

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    Grant amount:\2100000 ( Direct Cost: \2100000 )

    平成13年度は,金属間化合物TiAlの電気化学的手法による室温高延性発現挙動を検討し,Tiの電位-pH図上において,(1)酸化物が安定な電位域では環境脆化が認められず,真空中と同様の室温高延性を発現すること,(2)イオンが安定な電位領域では水素の侵入による著しい環境脆化が認められること(3)水素化物が安定な電位領域では非常に薄く緻密な水素化物の形成により環境脆化感受性が(2)の場合に比べて減少することを明らかにした.平成14年度は他の高強度Ti合金であるTi-6Al-4vに同様の手法を適用し,Ti合金としての室温高延性発現に関する電位-pH領域の明確化を目指した.その結果,溶液のpHが3以上の場合にはTiAlに認められた環境脆化が認められず,高延性を発現した.しかしながら,pH1の場合には極めて明確な環境脆化が生じ,延性が低下する電位域が存在した.すなわちTiの電位-pH図上で(1)酸化物安定電位域である-500mV以上では空気中と同様の延性を示し,(2)Tiイオン安定電位域である-500mVから-1500mVでは亀裂を伴う延性の減少が認められ,破断試料のXRD解析により水素化物が検出された.また,(3)水素化物安定領域である-1500mV以下では延性が(1)の条件のものと同値になるまで回復し,水素化物も検出されなかった.したがって,高強度Ti-6Al-4Vも金属間化合物TiAlと同様の機構により環境脆化が発現すると推察される.また,Ti-6Al-4Vの方がより低pHにおいて顕著な環境脆化を発現することから,Ti合金中のAl濃度が減少するほど,環境脆化が防止されることが示唆される.最後に,Ti合金の室温高延性発現のためには,水溶液中において酸化物安定領域に環境条件を設定することが重要であることを提案する.

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  • 文部科学省科学技術振興調整費総合研究 (研究代表者)

    2001 - 2002

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  • Corrosion Monitoring for Deep Underground Environment

    Grant number:12450296  2000 - 2001

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    SHIBATA Toshio, HARUNA Takumi, FUJIMOTO Shinji

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    Grant amount:\7500000 ( Direct Cost: \7500000 )

    High-level radioactive waste is planned to be buried deep underground, i.e. geological isolation. Carbon steel is one of the candidate materials for an overpack, which is metallic container to prevent the high level radioactive waste from contact with groundwater for long period. Although the overpack material is supposed to be exposed to oxygen free and very week corrosive environment, corrosion monitoring is necessary for very long term safe keeping. In this work, the effect of various ionic species, which may exist in the geological isolation environment, on the corrosion rate of carbon steel, and possibility of the assessment of the very low corrosion using electrochemical noise analysis are investigated in order to establish reliable and simple corrosion monitoring system in the environment.
    The corrosion behavior of SM400B carbon steel was analyzed in terms of the effect of sulfate, carbonate and bi-carbonate ions. SM400B exhibited two anodic peaks the height of which were roughly proportional to the equivalent bi-carbonate ions concentration. On the other hand sulfate did not affect the general corrosion rate. Sulfate ions, however, promoted pitting corrosion, whereas carbonate and bi-carbonate ions suppressed. Sulfate ions were also observed to be reduced at the corrosion potential of carbon steel. Therefore, sulfate ions were proved to act as oxidant for corrosion of carbon steel in the oxygen free environment.
    Three coupons of SM400B were immersed in de-aerated bi-carbonate aqueous solution. The current and potential between these coupons were measured, fluctuation of them were converted into power spectrum in frequency domain. Power density at lower frequency of current, potential, and the apparent corrosion resistance, which was obtained as the division of fluctuation of potential and current, exhibited good correlation with corrosion rate which was also measured by polarization curve. The correlation coefficient between corrosion rate and power density of current fluctuation at 3 mHz attained to 0.8〜0.9, which is sufficient reliability for corrosion rate monitoring. Therefore, it is concluded that noise power density of current fluctuation between two coupons is possible to be adopted for corrosion monitoring of carbon steel in the geological isolation environment.

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  • 科学研究費補助金 基盤研究(B) (研究分担者)

    2000 - 2001

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  • Development of Scanning Laser Enhanced Electrochemical Microscope for Hydrogen Detection

    Grant number:11555185  1999 - 2000

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B).

    SHIBATA Toshio, KUSHIDA Takahiro, FUJIMOTO Shinji, HARUNA Takumi

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    Grant amount:\9600000 ( Direct Cost: \9600000 )

    The research of hydrogen enbrittlement has needed a new system to detect the positional distribution of hydrogen concentration in/on high strength steels and the other metals. For the purpose, we have developed the Scanning Laser Enhanced Electrochemical Microscope for Hydrogen Detection (H-SLEEM). The principle of this system is described in the following : Ar laser is introduced to an optical microscope through glass fiber. The laser is converged by an object lens, and is irradiated to the metal through the layer of aqueous solution. Two electrochemical cells are attached to the metal. Acid or neutral solution is in the one cell to introduce hydrogen. The introduction of hydrogen can be promoted by electrochemical method. In the other cell, the metal is anodically polarized in alkali solution. Permeation rate of the hydrogen diffused from the hydrogen introduction side of the metal can be obtained by monitor the anodic current. In the case that the converged laser is irradiated to the anodically polarized metal surface of hydrogen detection side, the anodic current may increase due to thermal acceleration of hydrogen oxidation process at very small irradiation site. The current increment by laser irradiation may depend on hydrogen content on the hydrogen detection surface. Therefore, it is expected to obtain two-dimensional hydrogen distribution on the hydrogen detection surface in the solution in-situ by scanning the converged laser. The following was made clear in this study : The system was established in this term. The current increment by unconverged laser irradiation is almost linearly dependent on the hydrogen detection current. The converged laser also induced current increment of hydrogen detection. Scanning the converged laser from hydrogen detection area to the area covered by an insulator provided the mono-directional distribution in current increment relating to the hydrogen detection current at the small irradiation site.

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  • 科学研究費補助金 基盤研究(B) (研究分担者)

    1999 - 2000

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    Authorship:Collaborating Investigator(s) (not designated on Grant-in-Aid)  Grant type:Competitive

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  • 日本原子力研究所 原子力基礎研究制度 (研究分担者)

    1998 - 1999

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    Grant type:Competitive

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  • (社)日本鉄鋼協会 第7回鉄鋼研究振興助成 (研究代表者)

    1998

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  • (財)矢崎科学技術振興記念財団 国際交流援助(前期) (研究代表者)

    1998

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    Grant type:Competitive

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  • 光照射による自己修復機能強化ステンレス鋼の耐環境脆化性

    Grant number:09750795  1997 - 1998

    日本学術振興会  科学研究費助成事業  奨励研究(A)

    春名 匠

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    Grant amount:\2200000 ( Direct Cost: \2200000 )

    ステンレス鋼はその表面にナノスケールのバリアー型不働態皮膜を自発的に形成する,いわば自己修復機能を示し,環境劣化(腐食)を自発的に抑制する.本研究では,バリアー型不働態皮膜の形成段階もしくは荷重付加段階で光照射を行うことにより自己修復機能をさらに強化したステンレス鋼の耐環境脆化性を検討した.
    本年度は,CCDマイクロスコープを導入した低ひずみ速度環境脆化試験装置に,自作した電解質水溶液中の引張試験片表面に紫外線を照射できる反応槽を組み合わせ,充分に脱気された0.001MNaCl水溶液(95℃)中における鋭敏化304ステンレス鋼の環境脆化に及ぼす紫外線照射の影響を調査した.試験中の試験片は-200mV(SSE)に固定された.その結果,試験開始から0.2%耐力をわずかに超える時間(18ks)まで紫外線を照射すると,未照射材に比べてき裂発生数が顕著に減少し,試験開始前の応力無負荷時に同じ時間(18ks)紫外線照射を行った場合にはき裂発生数が未照射材とほぼ同様であることが明らかになった.試験前の不働態皮膜の影響を検討するために.試験開始直前の0.9ks間,-200〜0mV(SSE)の所定の電位で不働態皮膜を形成させ,試験開始直前に-200mV(SSE)に戻して試験を行った.その結果,0mV(SSE)の場合には照射の有無に関わらずき裂発生数が極めて減少したが,それ以下の電位の場合には未照射に比べて照射した方がき裂発生数が減少した.一方,き裂進展速度は,照射,未照射,皮膜形成電位など様々な条件の変化に関わらず,平均して5×10^<-8>m/sであった.以上のことから,紫外線の照射はき裂発生のみ抑制することで,環境脆化を抑制し,塑性変形の開始時点まで紫外線を照射することが環境脆化の抑制に重要であることが明らかになった.

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  • 科学研究費補助金 奨励研究(A) (研究代表者)

    1997 - 1998

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    Grant type:Competitive

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  • 科学研究費補助金 基盤研究(A) (研究分担者)

    1996 - 1999

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  • Improvement of Environmental Resistance by Nano-Scale Surface Modification

    Grant number:08405048  1996 - 1999

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (A)

    SHIBATA Toshio, HARUNA Takumi, FUJIMOTO Shinji, TANIGUCHI Shigeji

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    Grant amount:\38300000 ( Direct Cost: \38300000 )

    The corrosion resistance is obtained by the surface oxide film, which prevents the substrate alloys from harmful effect of the environment. Therefore, the corrosion resistance is highly depends on the structure of the surface film. In the present work, we developed some processes, which modify nano structure of the surface film to obtain more protective films. The summaries are described below. (1) Chemical modification of passive film on stainless steels; the combination of active dissolution and passivation derived selective Fe dissolution and Cr enrichment in the passive film to show excellent corrosion resistance. Especially, a process in F? ions containing bath was developed. (2) Ion implantation on stainless steels; Cr implantation derived the passive film with concentrated Cr. However, it was proved that pre and post treatments to modify the nano structure of the substrate were necessary in order to obtain high corrosion resistance. (3) Modification of passive film by ultra-violet light irradiation; passive film of Fe-Cr and stainless steels were modified by uv light irradiation to obtain much higher corrosion resistance. The photo quantum effect enriched the Cr in the passive film. (4) Formation of high corrosion resistance thin alloys film with ordered structure by ion beam sputtering; very high corrosion resistant stainless steel films were obtained with chemical composition of ordinary grade, but with highly homogeneous structure. The effects of additives were also discussed. (5) Nano modification of the oxide scales formed on TiAl by very small Zr addition; the high temperature corrosion resistance of TiAl was improved by 0.2% Zr addition to TiAl. Zr addition was proved to modify the AlィイD22ィエD2OィイD23ィエD2 scale thinner and more homogeneous. The Zr addition changed the nano structure of scales to reduce diffusion of oxygen inward.

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  • Study on the Stainless Steel with Photo Induced Self Healing Ability

    Grant number:06555211  1994 - 1996

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (A)

    SHIBATA Toshio, OHNAKA Noriyuki, HARUNA Takumi, FUJIMOTO Shinji

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    Grant amount:\13300000 ( Direct Cost: \13300000 )

    Photo electrochemical response has been applied as a poweful in-situ characterization technique for the passive film on the metals and alloys. However, the effect of the light exposure on the corrosion behavior has been open to discussion. In this study, Type304 stainless steel immersed in 3.5% NaCl was exposed with ultra-violet light to improve pitting corrosion resistance in the same media. uv light of 325 nm in wave-length generated by He-Cd laser was used as light source with output power of 35 mW and the exposure area of 6 mm in diameter. The pitting potential, which is an index for pitting corrosion resistance, was shifted for about 80 mV after uv light exposure during film formation period prior to pitting corrosion test. The improvement of pitting corrosion resistance depends on the light intensity. In the range of the light available in this study, a most suitable intensity was observed.
    The pitting corrosion induction period at a constant applied potential was also measured and analyzed with the birth and death stochastic probability process for various applied potentials to obtain the generation and repassivation rate of pitting corrosion. The generation rate, gamma, was lowered by a factor about 6 after exposure of uv light during passivation. On the other hand, the uv exposure during pitting corrosion generation period leads to almost no change on mu, the repassivation rate. The exposure during pitting corrosion generation affects only very small improvement on lambda and mu.
    The X-ray photo electron spectroscopy revealed that the chromium in the passive film, which is known to improve the corrosion resistant of stainless steels, is enriched after an exposure of uv light. Therefore the uv exposure was confirmed to improve the self healing ability of stainless steel, which is obtained by chromium enrichment in the film.

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  • 科学研究費補助金 基盤研究(A) (研究分担者)

    1994 - 1996

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    Grant type:Competitive

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  • 応力腐食割れのin-situ観察に基づく破壊力学的・統計的解析

    Grant number:06750740  1994

    日本学術振興会  科学研究費助成事業  奨励研究(A)

    春名 匠

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    Grant amount:\900000 ( Direct Cost: \900000 )

    研究代表者を含むグループは最近、応力腐食割れ(SCC)試験のひとつである低ひずみ速度試験(SSRT)法に、高倍率でありながら長焦点距離・長被写界深度を有するCCDカメラシステムを組み合わせることにより、SSRT中に試料表面に発生・進展する多数個のき裂の挙動をIn-situ1に精度よく観察・記録する手法を開発した。この手法を用いることにより、SCC感受性を従来のSSRTによる評価因子であった最大応力や破断伸びなどの材料の機械的性質だけでなく、き裂の発生・進展に関する因子(き裂発生時間やき裂進展速度など)を区別して評価することができ、注目する系のSCC挙動をより詳細に検討することができる。本研究では近年、新しい標準SCC試験溶液として注目されている塩化カルシウム水溶液中におけるType304鋼の応力腐食割れに本手法を適用することにより、SSRT中におけるき裂の挙動に対する塩化物濃度の影響を検討した。ガラス電極で観測しながらpHを7に調整した373Kの10〜50mass%CaCl_2中では、Type304鋼の最大応力もしくは破断伸びは濃度の増加とともに減少した。き裂挙動を詳細に解析して結果、き裂の発生したときのひずみは濃度の増加とともに減少したが、K_<ISCC>の最低値は濃度に依存しないことが明らかになった。一方、き裂進展速度は30mass%以上の濃度域ではほぼ一定値を示した。以上の結果を総括すると、CaCl_2中におけるType304鋼の応力腐食割れによる機械的性質の劣化のCaCl_2濃度り依存性は、き裂の進展に関する因子に比べて、き裂の発生したときのひずみなどのき裂の発生に関する因子によって決定されていることが明らかになり、本系のSCCを防ぐためにはSCCの発生を抑制するための手段を考えることが良策であることが示唆された。

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  • 科学研究費補助金 奨励研究(A) (研究代表者)

    1994

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    Grant type:Competitive

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  • (社)日本鉄鋼協会 石原・浅田研究助成 (研究代表者)

    1991

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    Grant type:Competitive

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Social Activities

  • ステンレス協会 ISO/TC156対策委員会n WG1委員

    2021

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  • 日本鉄鋼協会 「微生物腐食の解明と診断・抑止技術の構築」研究会委員

    2020 - 2022

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  • 日本鉄鋼協会 「腐食劣化解析に基づく鋼構造物維持の最適化」研究会委員

    2018 - 2021

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  • 日本原子力学会 「NUMO包括的技術報告書レビュー」特別専門委員会委員

    2018 - 2019

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  • 新エネルギー産業技術総合開発機構 自動車用圧縮水素容器の基準整備・国際基準調和に関する研究開発 腐食試験法作成タスクフォース委員

    2017

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  • 原子力安全研究協会 「人工バリア材料の腐食試験及び腐食データの解析委員会」委員

    2014 - 2020

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  • 日本鉄鋼協会・日本金属学会関西支部 「材料セミナー」講師

    2014 - 2016

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  • 大阪ベイエリア金属系新素材コンソーシアム・関西経済連合会 モノづくり人材の育成・再教育に資する実践的なプログラム「金属・材料工学」開発検討会

    2012

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  • 腐食防食学会・溶接学会 プラント材溶接部腐食合同研究委員会委員

    2011 - 2020

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  • 関西電食防止対策委員会 常任委員

    2011

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  • 電気学会 電力技術委員会 次期調査専門委員会「鋼材系配電設備の錆対策の技術動向と課題」委員

    2010 - 2012

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  • 科学技術振興事業団 Webラーニングプラザ教材製作委員会委員

    2010 - 2011

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  • 日本学術振興会 「化学プラントのリスクベース保全技術」に関する先導的研究開発委員会委員

    2004 - 2021

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  • 腐食防食協会 「低炭素ステンレス鋼SCC機構」研究会委員

    2003 - 2014

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  • 原子力環境整備促進・資金管理センター 「高レベル放射性廃棄物処分技術開発委員会(処分技術WG)委員

    2002 - 2013

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  • 機械システム振興協会受託調査事業「自己修復可能な高温腐食保護皮膜技術に関する調査」委員会委員

    2001 - 2002

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  • 日本原子力産業会議関西原子力懇談会「原子力構造物の長期供用下における材料特性変化と構造物の信頼性評価」委員会委員

    2000 - 2002

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  • 日本原子力学会 「水化学最適化」研究専門委員会「構造材・水環境相互作用」ワーキンググループ委員

    2000 - 2002

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  • 日本鉄鋼協会・日本金属学会関西支部 「材料セミナー」講師

    1996 - 1999

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  • (社)日本材料学会 腐食防食部門委員会「熱交換器の余寿命推定」タスクグループ委員

    1993 - 1995

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  • 日本材料学会 腐食防食部門委員会「熱交換器の余寿命推定」タスクグループ委員

    1993 - 1995

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Devising educational methods

  • 2007年度の理工学部改組からカリキュラムの変更が2回ほどあり,調査対象期間を継続して改善している科目はほとんどない.授業の工夫は,毎年の授業評価アンケートの結果に基づき,PPTから板書への変更や講義問題集の作成などを行った.オフィスアワーについては電子メールで日程調整を行い,できるだけ早い日程で随時対応している.

Teaching materials

  • 作成した教科書は「マテリアル科学実験1・2」ならびに「マテリアル工学実験1・2」のテキスト(分担執筆),「フレッシュマンゼミナール(実験)」のテキストを作成した.いずれも,化学・物質工学科およびマテリアル科学コースの教員で議論したオリジナルな内容であり,4年次の特別研究に必要と考えられる内容を抽出してある.「マテリアル科学演習」の隔週に実施する問題(分担執筆)も作成した.この講義は上記コースの2・3年次で学習する必修科目の内容を確認し,応用する力を養うことを目的としている.

Teaching method presentations

  •  特になし

Special notes on other educational activities

  •  特になし