Corrosion Protection Technology of 0Cr18Ni9 Stainless Steel Sheet Metal Parts

Three corrosion protection measures, including magnetic polishing, magnetic polishing+passivation and passivation+magnetic polishing were developed to address the problem of heavy surface oxidation caused by heat treatment of 0Cr18Ni9 stainless steel deep drop pressed sheet metal parts, which resulted in corrosion during use, and compared with untreated samples. The results show that the untreated and magnetic polishing treated samples exhibited severe corrosion after 96 hours of salt spray test, while the samples treated with magnetic polishing and passivation exhibited localized pitting after 96 hours of salt spray test. The samples treated with passivation and magnetic polishing did not show corrosion after 96 hours of salt spray testing. After 960 hours of salt spray testing, only localizd rust appeared, and the surface remained bright, and the salt spray resistance time was 10 times more than those of the other three samples.