The electrified tribological behavior and mechanism of CrN coating under lubricated conditions

作者：Xin Huang, Fu Wang, Yunhai Zhang, Xuejun Cui, Guangan Zhang, Song Luo · 发表于：Journal of Materials Research and Technology · 年份：2025 · DOI：10.1016/j.jmrt.2025.11.061 · 被引用次数：5 · 研究领域：Lubricants and Their Additives、Metal and Thin Film Mechanics、Electrical Contact Performance and Analysis

Metal nitride coatings demonstrate significant potential for enhancing the tribological performance of mechanical parts in electrified contacts due to their exceptional mechanical properties, high wear resistance, excellent thermal stability, and favorable electrical conductivity. This study investigated the friction and wear behaviors of CrN-coated surfaces against steel under lubricated electrified conditions. The electric current intensity and direction were changed to explore their influence on the friction and wear behavior. Experimental results indicated that forward and reverse currents induced a 4% to 44% increase in friction compared to non-electrified conditions. Notably, friction coefficients exhibited sticking characteristics when the electric current exceeded 1.0 A. Forward current exacerbated steel wear, while reverse current accelerated coating damage. A graphite-like carbonaceous tribo-layer formed at the CrN/steel interface under electrified conditions, especially with forward current. Reverse current promoted abrasive wear mechanisms, contrasting with the adhesive wear mechanisms under forward current conditions. Furthermore, electric current enhanced the steel counterpart oxidation while suppressing the formation of protective sulfate/phosphate tribo-film. These insights advance fundamental understanding of CrN coating in electrified sliding contacts, with critical implications for optimizing the lubrication designs of electrified contacts.