copper matrix;  chromium permeation of slurry;  Abrasion resistance

Low hardness and poor wear resistance restrict the application of copper in the field of metallurgical equipment. In order to improve the surface hardness and wear resistance of copper metal, the nickel-plated slurry clad chromizing technology is used to chromize the copper surface. The chromium-infiltrated layer was prepared, and its microstructure, diffusion characteristics, microhardness and wear resistance were studied. The results show that after nickel plating and chromium plating on the copper surface, a 50μm chromium permeated layer is obtained on the surface of the nickel layer, and the structure of the permeable layer is a nickel-chromium solid solution phase. The hardness of the permeable layer gradually decreased from 345 HV in the outer layer to 120 HV in the nickel coating and 70 HV in the copper matrix, and the microhardness of the permeable layer decreased with the decrease of chromium content. Chromium permeation reduces the coefficient of friction of copper and nickel from 0.8 and 0.6 to 0.45.