ステンレス鋼の電気化学特性に対する酸化皮膜損傷の影響

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  • Effect of Oxide Film Damage on Electrochemical Property of Stainless Steels

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<p>Austenitic stainless steel used in nuclear power plants sometimes meets a stress corrosion cracking during their long period of operation. The corrosion resistance of stainless steel is attributed to the repassivation of the chromium oxide film when it was damaged. If the corrosion rate exceeds the repassivation rate, the corrosion continues and leads to cracking. The polarization curve is important as an electrochemical property to evaluate the corrosion rate. In this study, we evaluated the effect of oxide film damage on the polarization curve of stainless steel. To neglect the effect of repassivation, we employed a rapid tensile test under a constant potential condition. Multiple tensile tests with different potentials were carried out and they yielded the polarization curve for arbitrary plastic strains, that is, arbitrary damages of oxide film. The results showed that the natural potential decreased and the current density drastically increased as the plastic strain increased. However, we found that the availability of the constant potential test was limited within a fixed range of measurement due to a restriction on the response rate of the measurement circuit.</p>

収録刊行物

  • 年次大会

    年次大会 2023 (0), S081-01-, 2023

    一般社団法人 日本機械学会

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