A Ni-based alloy powder with a composition of 24 Cr, 13 wt% Mo, and Ni balance was used in this study. The coatings were prepared by laser cladding at different laser powers on 30CrMnSiA steel substrates. The effect of laser power on the microstructure, element dilution rate, microhardness, and corrosion resistance of the coatings was investigated. The results showed that the coatings had a metallurgical bond with the substrate. The coatings mainly contained (Fe,Ni) solid solution and Cr0.19Fe0.7Ni0.11 phases. The Ni-based alloy coatings had a higher microhardness and better corrosion resistance than the 30CrMnSiA steel substrate. A decrease in laser power resulted in a finer grain size, lower element dilution rate, and higher microhardness. The coating prepared at a laser power of 2400 W showed the best corrosion resistance, with a higher corrosion potential and lower corrosion current density after immersion in 3.5% NaCl solution, because of a lower element dilution rate and better coating quality. In contrast, the coating prepared at 3000 W had a high porosity and poor corrosion resistance.

在本研究中使用了组成为 24 Cr、13 wt% Mo 和 Ni 余量的 Ni 基合金粉末。涂层是通过在 30CrMnSiA 钢基材上以不同的激光功率进行激光熔覆制备的。研究了激光功率对涂层微观结构、元素稀释率、显微硬度和耐腐蚀性能的影响。结果表明，涂​​层与基体具有冶金结合。镀层主要含有(Fe,Ni)固溶体和Cr0.19Fe0.7Ni0.11相。Ni基合金涂层比30CrMnSiA钢基体具有更高的显微硬度和更好的耐腐蚀性。激光功率的降低导致更细的晶粒尺寸、更低的元素稀释率和更高的显微硬度。在 2400 W 激光功率下制备的涂层表现出最好的耐腐蚀性，浸入 3.5% NaCl 溶液后具有更高的腐蚀电位和更低的腐蚀电流密度，这是因为元素稀释率更低，涂层质量更好。相比之下，在 3000 W 下制备的涂层具有高孔隙率和较差的耐腐蚀性。