Abstract:To prolong the life of the desulfurization slurry circulating pump impeller. In this study, WC-reinforced CoCrFeNiTi-WCx(x=0, 5, 10, 15, and 20 wt%) high–entropy alloy (HEA) coatings were fabricated on the base material 30CrMnSiA steel surface of desulfurization slurry circulating pump impeller by laser cladding. The effects of WC content on the microstructure, phase composition, element distribution, microhardness, wear resistance, and corrosion resistance of the coatings were systematically studied. It was found that the phase composition of CoCrFeNiTi HEA coating was FCC (Fe-Ni), BCC (Fe-Cr), Laves (CoTi2), and AB-type (compounds of Ti) phases. With the increase of WC content, the diffraction peak intensity of Laves phase increased, and new phases carbides (WC, TiC, Cr7C3, and Fe3C) were formed. The microstructure of CoCrFeNiTi HEA coating was mainly composed of cellular crystals at the bottom and equiaxed dendrites at the top. With the increase of WC content, the coating microstructure was mainly equiaxed dendrites, and the grain size gradually refined. The addition of WC improved the performance of the coatings, among which the CoCrFeNiTi-20% WC coating had the largest microhardness of 654.955 HV0.2 and the smallest coefficient of friction (0.664) and wear quality(1.3×102 um^3?s^(-1)?N^(-1)), the best wear resistance, and the wear mechanism was mainly slight adhesive wear and abrasive wear. In addition, with the increase of WC content, the coating showed lower corrosion rate and corrosion current. Among them, CoCrFeNiTi-20%WC coating had the smallest corrosion current and the best corrosion resistance.