イソプロピルアルコール中での電解研磨SUS316Lステンレス鋼の局部腐食とその防止のための表面処理法

This study developed surface finishing methods to prevent corrosion of electropolished SUS316L stainless steel in isopropyl alcohol（IPA）. For this development, immersion tests 99.7% IPA and anodic polarization 0.15 kmol･m－3 HCl were conducted using specimens passivated with 30% HNO3, 0.1 Na2MoO4-containing 3.5% H2O2 0.98% H2O2- containing 8% citric acid. Identical also applied heated 200－450 ℃ after passivation treatments. Corrosion morphologies these exhibited pitting. Pit densities rates showed good correlation pitting potentials HCl. Judging from the obtained values pit potentials, HNO3 or very resistance against corrosion. Heat-treatment at 200 increased IPA. However, heat-treatment temperatures higher than 350 decreased resistance.