利用ＣＯ＿２连续激光器在４５钢表面进行了激光熔敷镍基合金、镍基Ｃｒ＿２Ｏ＿３合金和镍基ＷＣ合金，以２Ｃｒ１３不锈钢为对比材料，系统地研究了激光熔敷层在不同冲击速度和腐蚀介质浓度下的腐蚀磨损特性，并根据组织分析、显微硬度测试及腐蚀磨损后的表面形貌观察，探讨了激光熔敷层的腐蚀磨损过程。结果表明：激光熔敷层的腐蚀磨损性能均比２Ｃｒ１３不锈钢好。 Laser cladding Ni-based alloy, Ni-based Cr_2O_3 alloy and Ni-based WC alloy on the surface of 45 steel were carried out by CO_2 continuous laser. The effects of laser cladding on the impact strength and corrosion medium concentration were studied systematically with 2Cr13 stainless steel as reference material. Under the corrosion and wear characteristics, and according to the analysis of the microstructure, the microhardness test and the observation of the surface morphology after the corrosion wear, the corrosion wear process of the laser cladding layer is discussed. The results show that the corrosion and wear properties of laser cladding layer are better than 2Cr13 stainless steel.