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1999 Fiscal Year Final Research Report Summary

MECHANO-ELECTROCHEMISTRY OF MICRO-SURFACE AREA OF MATERIALS

Research Project

Project/Area Number 09305047
Research Category

Grant-in-Aid for Scientific Research (A)

Allocation TypeSingle-year Grants
Section一般
Research Field Material processing/treatments
Research InstitutionHOKKAIDO UNIVERSITY

Principal Investigator

SEO Masahiro  Grad. School of Eng., Hokkaido Univ., Prof., 大学院・工学研究科, 教授 (20002016)

Co-Investigator(Kenkyū-buntansha) FUSHIMI Koji  Grad. School of Eng., Hokkaido Univ., Inst., 大学院・工学研究科, 助手 (20271645)
AZUMI Kazuhisa  Grad. School of Eng., Hokkaido Univ., Asso. Prof., 大学院・工学研究科, 助教授 (60175875)
Project Period (FY) 1997 – 1999
KeywordsMechano-electrochemistry / Nanoindentation / Passive Film / Load-depth Curv / Mechanical Property / Iron / Titanium / Anodic Oxide fil
Research Abstract

Nanoindentation tests were performed for the single crystal iron (100) surfaces electrochemically controlled in pH 8.4 borate solution to measure the load-depth curves from which the mechanical properties such as hardness and elastic modulus of the iron surfaces were evaluted to obtain the fundamental knowledge for estabilshment of mechano-electrochemistry. The hardness of the iron surfaces was fluctuated depending on the position of nano-surface area. The average value of hardness, however, took a minimum at 0.25 V in the passive potential region. At the potential above 0.25 v, the average hardness increased linearly with increasing the potential, I.e., the thickness of passive film. The hardness of film itself could be separated from that of the substrate iron by using the linear relation between average hardness and film thickness. Moreover, the nanoindentation tests were performed for the single crystal iron (100) and (110) surfaces passivated at 1.0 V in pH 8.4 borate solution to … More investigate the depedence of hardness on crystal orientation of the surface. However, no significant differences in hardness was observed between single crystal iron (100) and (110) surfaces.
The hardness of the polycrystalline titanium surfaces subjected to anodic oxidation in various electrolyte solutions was measured as a function of formation potential of anodic oxide film. The hardness increased with increasing the film formation potential up to 8 V. The hardness decreased rapidly above 8 V at which the local breakdown of the film would take place. Moreover, the largest hardness was observed for the titanium surfaces subjected to anodic oxidation in sulfuric acid. The stresses generated in the anodic oxide film on titanium were measured by a laser-beam deflection method to investigate the relation between stress in the film and hardness. The largest compressive stresses were generated in anodic oxide film on titanium in sulfuric acid. Therfore, it is found that there is a good correlation between compressive stress and hardness. The partial release of the compressive stresses were observed at the potential above 8 V at which the local breakdown of anodic oxide film took place. The rapid decrease in hardness at the potential above 8 V was ascribed to the partial release of compressive stress ue to local breakdown of anodic oxide film. Less

  • Research Products

    (12 results)

All Other

All Publications (12 results)

  • [Publications] 糠谷文泰: "アノード酸化物皮膜で覆われたチタン表面のナノインデンテーション"材料と環境'99講演集. 55-56 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Seo: "Nano-mechano-electrochemistry of iron (100) surface in solution"J.Electroanal.Chem.. 473. 49-53 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Seo: "In-situ Nano indentation of a Single Crystal Iron (100) Surface Possivated in pH 8,4 Bovic-Borate Solution"Electrochem.Soc.Proceedings. 98・17. 1-10 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 瀬尾眞浩: "チタンアノード酸化物皮膜の応力測定"第46回材料と環境討論会講演集. 43-46 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Seo: "Nano indentation of the Titanium Surfaces Covered with Anodic Oxide Films"Proc.8th International Symposium on Passivity of Metals and Semiconductors. (印刷中).

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 瀬尾眞浩: "アノード酸化物皮膜の応力"表面技術. 51・4. 1-7 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] F. Nukaya, K. Azumi, M. Seo: "Nano-indentation of Ti Surface Covered with Anodic Oxide Film."Proc Zairyo-to-Kankyo. 55-56 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M. Seo, M. Chiba, K. Suzuki: "Nano-mechano-electrochemistry of Iron (100) Surface in Solution."J. Electroanal Chem.. 473. 49-53 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M. Seo, M. Chiba, K. Suzuki: "In-situ Nanoindentation of a Single Crystal Iron (100) Surface Passivated in pH 8.4 Boric-Borate Solution."Proc. ECS.. Vol.98-17. 1-10 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M Seo, K Ueno, K Fushimi, H Habazaki: "Stress Measurement of Ti Anodic Oxide Films."Proc. 46th Japan Conference on Materials and Environments. 43-46 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M. Seo, F. Nukaya, K. Azumi: "Nanoindentation of the Titanium Surfaces Covered with Anodic Oxide Films."Proc. 8th Intern. Symp. On Passivity of Metals and Semiconductor. (in press). (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M. Seo, K. Ueno: "Stresses in Anodic Oxide Films."J. Surf. Finish. Soc. Of Japan. 51(4)(in press). (2000)

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      「研究成果報告書概要(欧文)」より

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Published: 2001-10-23  

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