Work

Decline in pitting corrosion resistance of 316 L stainless steel induced by Cr-depleted layer during tribocorrosion

Year: 2025

Type: article

Abstract: The pitting corrosion resistance of austenite stainless steel was significantly reduced during tribocorrosion: corrosion pits with high density formed far below pitting potential. The aim of this study is to investigate the effects of tribocorrosion on the metastable pitting corrosion behaviour of 316 L stainless steel. The results indicated that the formation of a Cr-depleted layer on nanocrystallized surface (NS) during tribocorrosion played the crucial role in reducing pitting corrosion resistance of the stainless steel. The Cr-depleted layer led to a significant increase in defect density and a reduction in Cr content in the passive film, that increased the number of pitting nucleation sites and weakened the chloride-resistance of the passive film. Further, the initial dissolution of the Cr-depleted layer provided a high cation concentration to sustain pit growth on the NS with high reactivity beneath it. Consequently, metastable pits with high density could initiate and grow at low potentials.

Source: npj Materials Degradation

DOI: 10.1038/s41529-025-00569-8

Authors: Zhongwei Wang, Yinchao Wu, Lijie Qiao, Yu Yan

Institutions: Chongqing University of Technology, University of Science and Technology Beijing

Language: English

Topic: Hydrogen embrittlement and corrosion behaviors in metals

Subfield: Metals and Alloys

Field: Materials Science

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $2,590

Funder: Natural Science Foundation Project of Chongqing, Chongqing Science and Technology Commission