Tribocorrosion Behavior of a Medium-Entropy Austenitic Stainless Steel in 3.5 wt.% NaCl: A Comparative Study with 304 and S31254 Stainless Steels
Journal
Lubricants
Journal Volume
13
Journal Issue
6
Start Page
260
ISSN
2075-4442
Date Issued
2025-06-11
Author(s)
Wang, Chun-Hao
Huang, Shih-Yen
Chu, Yu-Ren
Hsu, Peng-Shu
Chu, Peng-Wei
Abstract
This study investigates the tribocorrosion behavior of 304 stainless steel (304SS), S31254 super austenitic stainless steel (S31254 SASS), and a medium-entropy austenitic stainless steel (MEASS) in 3.5 wt.% NaCl solution under sliding conditions. The objective is to clarify the performance differences among these alloys when exposed to simultaneous mechanical wear and corrosion. Electrochemical techniques, including potentiodynamic polarization and potentiostatic sliding tests, were used to evaluate corrosion resistance and repassivation behavior. Quantitative analysis based on ASTM G119 revealed that MEASS showed a 68% lower total material loss compared to 304SS and a 55% lower loss compared to S31254. MEASS also exhibited the lowest corrosion current density (1.46 μA/cm2) under tribocorrosion conditions, representing an 83% reduction compared to 304SS. These improvements are attributed to the higher chromium and nickel contents of MEASS, which enhance passive film stability and reduce susceptibility to localized corrosion. The results demonstrate that MEASS offers superior resistance to combined mechanical and corrosive degradation in chloride-containing environments.
Subjects
corrosion-induced wear
medium-entropy austenitic super stainless steel
potentiodynamic polarization curves
repassivation
tribocorrosion
Publisher
MDPI AG
Type
journal article