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1996 Fiscal Year Final Research Report Summary

Study on the Stainless Steel with Photo Induced Self Healing Ability

Research Project

Project/Area Number 06555211
Research Category

Grant-in-Aid for Scientific Research (A)

Allocation TypeSingle-year Grants
Section試験
Research Field Material processing/treatments
Research InstitutionOsaka University

Principal Investigator

SHIBATA Toshio  Osaka University, Faculty of Engineering, Professor, 工学部, 教授 (90001205)

Co-Investigator(Kenkyū-buntansha) OHNAKA Noriyuki  Hitachi, Ltd, Hitachi Laboratory, Senior Researcher, 日立研究所, 主任研究員
HARUNA Takumi  Osaka University, Faculty of Engineering, Research Associate, 工学部, 助手 (70243186)
FUJIMOTO Shinji  Osaka University, Faculty of Engineering, Assistant Professor, 工学部, 講師 (70199371)
Project Period (FY) 1994 – 1996
Keywordsstainless steel / photoelectrochemical response / semi conductor / passive film / He-Cd Laser / ultra-violet light / pitting corrosion / birth and death stochastic process
Research Abstract

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.

  • Research Products

    (10 results)

All Other

All Publications (10 results)

  • [Publications] 柴田俊夫: "紫外線照射による塩化物水溶液中でのSUS304鋼の孔食発生抑制" 日本金属学会誌. 61・3. 249-250 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 藤本愼司: "SUS304鋼の孔食挙動に及ぼす紫外線レーザー照射の影響" 材料とプロセス. 9・3. PS-14 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 藤本愼司: "不働態皮膜の構造制御と耐環境性" 表面技術. 47・12. 1019-1024 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T. Shibata: "Scanning Laser Enhanced Electrochemical Microscopy for Corrosion Research" Materials Science Forum. 192・194. 733-739 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 柴田俊夫: "腐食測定法の現状と将来" 表面技術. 45・10. 968-972 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Shibata: "Inhibition of Pit Generation on SUS304 Stainless Steel in Chloride Solution by Ultra-Violet Light Irradiation" Journal of Japan Institute of Metals. Vol.61. 249 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S.Fujimoto: "Effect of ultra violet laser irradiation on pitting behavior of SUS30 steel" Current Advances in Materials and Processes. Vol.9. ps-14 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S.Fujimoto: "Modiication of the Passive Film for the Environmental Resistance" Hyomen-Gijitsu. Vol.47. 1019 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Shibata: "Scanning Laser Enhanced Electrochemical Microscopy for Corrosion Research" Materials Science Forum.Vols.192-194. 733 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Shibata: "Trends and Future of Corrosion Measurement Techniques" Hyomen-Gijitsu. Vol.45. 968 (1994)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1999-03-09  

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