Abstract
A coating on a CrNi3MoVA steel substrate was prepared by electrospark deposition tech nology with an equiatomic sintered electrode of a high-entropy CoCrFeNiW alloy. SEM, EDS, and XRD were used to investigate the morphology, composition and phase structure of the CoCrFeNiW high-entropy alloy coating. The tribological behavior of coating under different loads was investigated using a reciprocal friction and wear tester. The results showed that the as-deposited CoCrFeNiW coating with a hardness of 9.78 GPa is composed of face-centered cubic (FCC) and Cr₂O₃; compared with the CrNi3MoVA steel, the CoCrFeNiW coating has an obvious antifriction effect at 6 and 9 N load; the CoCrFeNiW coating remarkably increases the wear resistance of the CrNi3MoVA steel.

Key words
high-entropy alloy, CoCrFeNiW coating, electrospark deposition, tribological properties

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