采用喷射电镀在45钢表面制备了纳米晶镍镀层,并对其进行了激光重熔处理。分析了纳米晶镀层和激光重熔层的微观组织,测试了重熔层的显微硬度及耐腐蚀性能。结果表明:喷射电镀制备的镀层组织属于纳米晶范畴,激光重熔层与基体为冶金结合,内部组织由大量的枝晶和等轴晶构成;重熔层的硬度和耐腐蚀性明显提高。 Spray plating was used to prepare nanocrystalline nickel coating on the surface of 45 steel and the laser was remelted. The microstructure of nanocrystalline coating and laser remelted layer was analyzed. The microhardness and corrosion resistance of remelted layer were tested. The results show that the microstructure of the coating prepared by spray plating belongs to the category of nanocrystals. The laser remelted layer is metallurgically bonded with the substrate, and the internal structure consists of a large amount of dendrites and equiaxed grains. The hardness and corrosion resistance of the remelted layer are obviously improved.