Tribocorrosion of 316L stainless steel by in-situ electrochemical methods under deep-sea high hydrostatic pressure environment

Abstract

In-depth understanding of tribocorrosion of 316L SS in deep-sea is important for deep-sea application. In this work, the tribocorrosion behaviors of 316L stainless steel in 3.5 wt.% NaCl solution at different hydrostatic pressures have been investigated by in-situ electrochemical means. The results showed that tribocorrosion rate increased with hydrostatic pressure at a rate of 8.96 × 10−6 mm3·N−1·m−1·MPa−1. The passive film at higher hydrostatic pressure had lower OH and higher Cl-, which deteriorated the pitting susceptibility resistance. Consequently, the tribocorrosion volume increased due to the larger mechanical wear and enhanced synergism by corrosion-accelerated wear at higher hydrostatic pressure in deep-sea.