Abstract:Substation facilities are often used in the air environment and are susceptible to corrosion. Surface modification treatment of equipment can greatly improve the anti-corrosion performance of the facility and prolong its service life. Automatic thermal spraying technology, as a new surface modification method, is a technology that heats the alloy to molten or semi-molten state by heat source and coats the surface of the substrate. In this paper, the process parameters of fully automatic thermal spraying technology are studied, and the spraying process parameters with the best corrosion resistance are found, including spraying speed, maximum coating thickness, minimum porosity, spraying distance, spraying voltage and current. For these optimal parameters, a salt spray test was carried out on the thermal spray aluminum coating. The results show that oxidative corrosion occurs on the coating surface, and a corrosion product dominated by Al(OH)3 is generated and a dense oxide film is formed on the coating surface. In addition, the resulting corrosion products fill the pores created during thermal spraying, preventing the corrosive medium from penetrating further into the coating.