Corrosion Science and Technology

  • 제7권1호
  • /
  • Pages.35-39
  • /
  • 2008
  • /
  • 1598-6462(pISSN)
  • /
  • 2288-6524(eISSN)
한국부식방식학회 (The Corrosion Science Society of Korea)
권호 표지

Respondence Between Electrochemicl Fluctuations and Phenomenon for Localized Corrosion of Less-Noble Metals

  • Itoi, Yasuhiko (Department of Materials Chemistry and Bioengineering, Oyama National College of Technology) ;
  • Take, Seisho (Department of Materials Chemistry and Bioengineering, Oyama National College of Technology) ;
  • Tsuru, Tooru (Department of Metallurgy and Ceramics Science, Tokyo Institute of Technology)
  • 발행 : 2008.02.01
PDF 다운로드
⟨ 이전 논문 다음 논문 ⟩

초록

We have been studying application of electrochemical noise (Fluctuation) analysis for localized corrosion. Foils of Zinc, Aluminum and Magnesium were used as specimens for electrochemical cell simulating localized corrosion. These specimens were dipped in sodium chloride solutions adjusted to each exponent of Hydrogen ion concentration (pH) condition of 5.5, 10, 12 respectively. Time variations of potential and current were measured in those solutions, and simultaneously the surfaces of specimens were observed using microscope with television monitor. Two types of electrochemical cells were arranged for experiments simulated localized corrosion. The fluctuations on trendy component of short-circuited potential and short-circuited current were appeared in synchronization. It was seemed that these fluctuations result from hydrogen evolution on the aluminum active site in the crevice from the microscopic observation. In the case of zinc and magnesium, fluctuations appeared on the trendy component of the corrosion potential. Two types fluctuation were detected. First one is the fluctuation varied periodically. The second one is the random fluctuation. It was seemed that these fluctuations result from generation of corrosion products and hydrogen evolution on the active site in the crevice of zinc and magnesium from the microscopic observation.

키워드

참고문헌

  1. Y. Itoi, M. Okuyama, Electrochemistry, 66, 1088 (1998)
  2. Y. Itoi, Y. Sudo, R. Nakazato, M. Okuyama, Proc. JSCE Materials and Environments 1999, p. 337, JSCE (1999)
  3. Y. Itoi, S. Matsumoto, M. Okuyama, Proc. JSCE Materials and Environments 2000, p. 309, JSCE (2000)
  4. S. Magaino, A. kawaguchi, A. Hirata and T. Osaka, J. Electrochem. Soc., 134, 2993 (1987) https://doi.org/10.1149/1.2100328
  5. T. Shinohara, S. Fujimoto, N. J. Laylok, A. Masallem, H. Ezuber and R. C. Newman, J. Elecrochem. Soc, 144, 3791 (1997) https://doi.org/10.1149/1.1838093
  6. K. Hladky and L. Dawson, Corrosion Sci., 21, 317 (1981) https://doi.org/10.1016/0010-938X(81)90006-8
  7. K. Hladky and L. Dawson, Corrosion Sci., 22, 231 (1982) https://doi.org/10.1016/0010-938X(82)90107-X
  8. Y. Itoi, M. Okuyama, J. Technology and Education, 3, 120 (1994)
  9. Y. Itoi, M. Okuyama, J. Technology and Education, 3, 128 (1994)