Abstract:The Ni-W alloy coating was prepared on the surface of N80 steel with electroplating method, the coating surface and interface morphologies and the distributions of chemical elements were analyzed with SEM and EDS, respectively, and its phases was measured with XRD. The capability of salt spray corrosion for the Ni-P coating in 5% NaCl solution was tested, and the mechanism of salt spray resistance was discussed. The experimental results show that the coating thickness is about 40µm, the main phase of the coating is Ni-W, the Ni and W elements are presented in the coating with metal form; The diffusion phenomenon of chemical elements is produced in the coating-substrate interface after high temperature treatment, and forming metallurgical bonding; after the salt spray corrosion, corrosion products on the coating surface are oxides and chlorides of Fe, the substrate has no corrosion phenomenon.