(CoCrFeNi)₉₅Nb₅ high entropy alloy (HEA) coatings were successfully fabricated on a substrate of Q235 steel by laser cladding technology. These (CoCrFeNi)₉₅Nb₅ HEA coatings possess excellent properties, particularly corrosion resistance, which is clearly superior to that of some typical bulk HEA and common engineering alloys. In order to obtain appropriate laser cladding preparation process parameters, the effects of laser energy density on the microstructure, microhardness, and corrosion resistance of (CoCrFeNi)₉₅Nb₅ HEA coating were closely studied. Results showed that as the laser energy density increases, precipitation of the Laves phase in (CoCrFeNi)₉₅Nb₅ HEA coating gradually decreases, and diffusion of the Fe element in the substrate intensifies, affecting the integrity of the (CoCrFeNi)₉₅Nb₅ HEA. This decreases the microhardness of (CoCrFeNi)₉₅Nb₅ HEA coatings. Moreover, the relative content of Cr₂O₃, Cr(OH)₃, and Nb₂O₅ in the surface passive film of the coating decreases with increasing energy density, causing corrosion resistance to decrease. This study demonstrates the controllability of a high-performance HEA coating using laser cladding technology, which has significance for the laser cladding preparation of other CoCrFeNi-system HEA coatings.

通过激光熔覆技术成功地在Q235钢的基底上制备了（CoCrFeNi）₉₅ Nb ₅高熵合金（HEA）涂层。这些（CoCrFeNi）₉₅ Nb ₅ HEA涂层具有出色的性能，尤其是耐腐蚀性，这明显优于某些典型的体HEA和常见的工程合金。为了获得合适的激光熔覆制备工艺参数，仔细研究了激光能量密度对（CoCrFeNi）₉₅ Nb ₅ HEA涂层的组织，显微硬度和耐蚀性的影响。结果表明，随着激光能量密度的增加，（CoCrFeNi）₉₅中的Laves相析出Nb ₅ HEA涂层逐渐减少，基材中Fe元素的扩散加剧，影响（CoCrFeNi）₉₅ Nb ₅ HEA的完整性。这降低了（CoCrFeNi）₉₅ Nb ₅ HEA涂层的显微硬度。此外，Cr ₂ O ₃，Cr（OH）₃和Nb ₂ O ₅的相对含量随着能量密度的增加，涂层表面钝化膜中的Al 2 O 3降低，导致耐蚀性降低。这项研究证明了使用激光熔覆技术的高性能HEA涂层的可控性，这对于其他CoCrFeNi系统HEA涂层的激光熔覆制备具有重要意义。