ステンレス鋼のすきま腐食生起及び進展停止臨界電位に及ぼす 非有害アニオン添加の影響
Effect on critical potentials for crevice corrosion initiation and repassivation of stainless steel by addition of inhibitive anion
著者:
渡辺 駿 Shun WATANABE 関口 智大 Tomohiro SEKIGUCHI 阿部 博志 Hiroshi ABE 渡邉 豊 Yutaka WATANABE
発刊日:
公開日:
crevice corrosioninhibitive anioninitiation potentialrepassivation potentialtype 316L stainless steel
概要
Austenitic stainless steels are widely used as structural materials in many industries. However, stainless steels are susceptible to crevice corrosion in the solution including chloride ions. In this paper, at first, the most inhibitive anion against corrosion was investigated by anodic polarization measurement of type 316L stainless steel in the solution containing Cl- with candidate inhibitive anions (WO42-, MoO42-, VO3-). MoO42- was adopted as the most inhibitive anion in this study. Next, the effect of MoO42- addition on critical potentials for crevice corrosion initiation and repassivation has been evaluated by immersion tests under constant potential. The increase of critical potentials were clearly observed by addition of MoO42-. It was also indicated that the MoO42- concentration required for crevice corrosion repassivation increases with increase of Cl- concentration.
