Natural serpentine powders were incorporated into phosphate bonded solid coatings to promote the antiwear performance of the phosphate coatings. Optimal mass percent of natural serpentine in phosphate coatings was rstly explored. Thereafter, in order to stimulate layer slip of natural serpentine and strengthen interfacial interaction between natural serpentine and counterface during the friction process, tribological performance of the composite coatings under different friction condition was properly investigated. The experimental result indicated that the optimal incorporation of natural serpentine in phosphate coatings was 10 wt.%, through which anti-wear performance of phosphate coatings was signi cantly elevated. Additionally, accompanied by the increase of applied load and sliding speed, natural serpentine was activated by friction force and local friction heat, and simultaneously interfacial interactions between naturals serpentine and counterface were intensi ed. As a result, a continuous protective tribo-lm was in-situ formed on the counterface, through which anti-wear performance of phosphate coatings were signi cantly promoted. At the same time, serious furrows generated on the counterface were also effectively self-repaired during the friction process, and further abrasion on the counterface was greatly restrained.

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