Abstract
Stable corrosion pits with collapsed characteristic were found on 316L stainless steel far below pitting potential during tribocorrosion in NaCl solution. The gradient nano-structured surface (GNSS) formed by surface deformation played a decisive role in inducing the collapsed pits. High density crystalline defects and dilution of Cr in topmost region of the GNSS resulted in normal pitting corrosion. Cracking was induced by local stress concentration at the bottom of the pit. The propagation of crack crossing the grain boundaries in the GNSS by anodic dissolution stress corrosion cracking (SCC) and dissolution of crack interior led to collapse of the surface.
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