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In this research, tribocorrosion behavior of NiP -ZrO2 electroless composite coating has been investigated in 3.5 wt.% NaCl solution. The steel samples were deposited by electroless deposition to form NiP and NiP -ZrO2 coatings. XRD and SEM were used to evaluate the microstructure of the coatings. Also, the corrosion and tribocorrosion behavior of the coatings have been investigated in 5 wt.% NaCl electrolytes. The results showed that the repassivation rate of NiP -ZrO2 composite coating was higher than the mechanical depassivation rate. Also, the corrosion resistance of the NiP coating was lower than that of NiP -ZrO2 composite coating after tribocorrosion. Moreover, the synergistic effects of corrosion and wear at an anodic potential (-100 mV Ag/AgCl) indicated that corrosion had more contribution to the weight loss in NiP coating rather than that of NiP -ZrO2 coating.

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