Research on the synergistic damage behavior of tribocorrosion of CoCrFeNi-X (Ti, Mn, Mo, Al) high-entropy alloys

• Published in: Tribology international 2025-01, Vol.201, p.110185, Article 110185
• Main Authors: Yang, Xianchen, Li, Xinmei
• Format: Article
• Language: English
• Subjects: Galvanic corrosion; HEAs; Synergies; Tribocorrosion; Worn area
• ISSN: 0301-679X
• DOI: 10.1016/j.triboint.2024.110185

This study investigates the damage behavior of CoCrFeNi-X (Ti, Mn, Mo, Al) high-entropy alloy coatings under reciprocating friction in a 3.5 wt% NaCl solution. Conventional tribocorrosion experiments and full-contact tribocorrosion tests were conducted to analyze the synergistic effects of corrosion and wear. Electrochemical analysis and surface characterization of the worn samples were performed to quantify the losses resulting from the synergistic effects in tribocorrosion. The results demonstrate a significant increase in the corrosion rate in the worn area by 2–3 orders of magnitude due to friction, accompanied by a notable potential difference between the wear scar region and the surrounding area. While corrosion products can reduce the friction coefficient, the localized damage induced by corrosion significantly enhances the wear volume. •The full-contact tribocorrosion test was designed to analyze the potential and corrosion current density in the worn area.•The potential significantly decreases at the beginning of friction.•Corrosion products act as lubricants. The higher the corrosion rate, the lower the friction coefficient.•The wear induced by corrosion is a major contributor to the increase in loss of material.