利用激光熔覆的方法在45钢基体上制备了CrNiAlCoMoB0.5高熵合金（HEA）涂层，研究了涂层组织结构及耐腐蚀性能。结果表明：涂层的耐腐蚀性良好；涂层在3.5%NaCl(质量分数)电解液中的腐蚀电位Ecorr和腐蚀电流Icorr与304不锈钢相当，耐点蚀能力优于304不锈钢，但是，涂层的钝化能力弱于304不锈钢；涂层在1 mol/L H2SO4电解液中的Ecorr和Icorr与304不锈钢在同一个数量级，且相当接近，表现出良好的耐腐蚀性能，涂层主要发生晶间腐蚀，304不锈钢为不规则的片状腐蚀；涂层在1 mol/L NaOH电解液中的Ecorr小于304不锈钢，其腐蚀倾向大于304不锈钢。同时涂层的Icorr小于304不锈钢的Icorr，即涂层的耐腐蚀性优于304不锈钢，且涂层钝化能力与304不锈钢相当。

CrNiAlCoMoB0.5high-entropy alloy (HEA) is prepared on 45# steel bylaser cladding. The microstructure and corrosion resistance properties of this HEA coating are studied. The results show that the corrosion resistance properties of the HEA are remarkable, corrosion electric potential Ecorr and corrosion currect Icorr of CrNiAlCoMoB0.5HEA are equal to those of 304 stainless steel in 3.5%NaCl (mass fraction) while the resistance to pitting is better. Compared with 304 stainless steel, the ability of passivating of HEA coating is weaker. In 1 mol/L H2SO4 electrolytic solution, the Ecorr and Icorr of HEA coating and 304 stainless steel are in an order of magnitude, which means corrosion resistance of CrNiAlCoMoB0.5 coating is remarkable. Corrosion behavior of the HEA coating is intergranular corrosion while 304 stainless steel is irregular flake corrosion. In 1 mol/L NaOH electrolytic solution, Ecorr of CrNiAlCoMoB0.5HEA coating is lower than that of 304 stainless steel, which shows that the tendency of corrosion is larger. Meanwhile, Icorr of the HEA coating is smaller, the corrosion resistance of CrNiAlCoMoB0.5HEA coating is better, and the ability of passivating is equal to that of the 304 stainless steel.