为了获得性能优异的涂层材料，采用激光熔覆的方法在Q235钢基体上制备了不同Mo含量的FeCrNiMnMoB0.5系高熵合金涂层，着重探究Mo对高熵合金组织与性能的影响。通过金相、X射线衍射、扫描电镜、硬度计、电化学工作站分别研究了高熵合金涂层的显微组织、相结构、显微硬度及耐蚀性能。结果表明：FeCrNiMnMoB0.5系高熵合金组织为树枝晶，主要由fcc相和少量金属间化合物构成。当添加少量Mo时，涂层的硬度较低，为290 HV，随着Mo的增加，晶格畸变加剧，出现少量金属化合物，涂层硬度最大增加到658 HV。在模拟饱和盐水泥浆溶液中FeCrNiMnMo0.4B0.5表现出较好的耐腐蚀性。

In order to obtain excellent coating materials, FeCrNiMnMoB0.5 high entropy alloy coatings were prepared on Q235 steel by laser cladding. The effect of Mo on microstructure and properties of high entropy alloy coatings have been investigated emphatically. By means of optical microscope, X-ray diffraction, scanning electron microscope, hardness tester and electrochemical workstation, the microstructure, phase structure, hardness and corrosion resistance were studied. Results show that the microstructure of FeCrNiMnMoB0.5 high entropy alloy coatings is dendrites and the coating is mainly composed of fcc phase and a small amount of intermetallic compounds. After adding a small amount of Mo, the average hardness is very low, about 290 HV.With the increase of Mo, lattice distortion is enhanced and metal compounds appear. The hardness of the coating reaches a maximum of 658 HV. Polarization curves indicate that FeCrNiMnMo0.4B0.5 shows good corrosion resistance in the saturated salt mud solution.