Sand blasting is to drive sand particles with the help of 0.5 ~ 0.7MPa compressed air and spray them on the metal surface at high speed through a special nozzle. Relying on the impact and friction of the edges and corners of sand particles, the rust and other dirt on the metal surface are completely removed to obtain a certain roughness and silver gray surface. Generally, dry press out sand blasting method is adopted. Dalian sand blasting and shot blasting processing. Sand blasting is applicable to the surface treatment of anti-corrosion projects such as rubber, plastic, FRP sheet lining, acid resistant plate lining, plastic spraying, metal spraying and other anti-corrosion coatings.