A Study on the localized corrosion and repassivation kinetics of Fe-20Cr-xNi (x = 0–20 wt%) stainless steels via electrochemical analysis. (November 2015)

• Record Type: Journal Article
• Authors: Oh, KkochNim; Ahn, SooHoon; Eom, KwangSup; Kwon, HyukSang
• Is Part Of: Corrosion science. Volume 100(2015)
• Page Start: 158
• Page End: 168
• Publication Date: 2015-11
• Subjects: Stainless steels -- Localized corrosion -- Repassivation -- Passive film -- Stress corrosion cracking; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2015.07.022
• Languages: English
• ISSNs: 0010-938X

Abstract

Highlights: Localized corrosion of Fe − 20Cr − x Ni ( x = 0–20 wt%) alloys is studied. Fe-20Cr-10Ni has the highest susceptibility to a metastable pitting. Fe-20Cr-10Ni exhibits the lowest repassivation rate and the weakest film protectiveness. Pit growth rate decrease with an increase in Ni content. Abstract: Effects of Ni on the film breakdown, repassivation and dissolution processes of Fe-20Cr- x Ni ( x = 0∼20 wt. %) stainless steels (SSs) were examined in a chloride. Among the SSs, Fe-20Cr-10Ni is the weakest to meta-stable pitting corrosion, due presumably to the highest defect density in its passive film. Scratch electrode tests reveal that the repassivation rate of the SSs increases with an increase or a decrease in nickel content from 10 %. Pit growth rate of the SSs decreases with Ni content. However, Fe-20Cr-10Ni alloy forms a pit with the highest aspect ratio, corresponding to its lowest repassivation potential.