Dalian sanding and derusting is widely used in hull derusting, steel structure derusting, drilling platform derusting and so on. The quality of pretreatment of derusting process affects the adhesion, appearance, moisture resistance and corrosion resistance of the coating. If the pretreatment is not done well, the corrosion will continue to spread under the coating, causing the coating to fall off in pieces. Sand blasting derusting uses compressed air to spray sand with a certain particle size on the rusted surface of the parts through the spray gun. It can not only remove the rust quickly, but also prepare the surface for painting, spraying, electroplating and other processes. The surface treated by sand blasting can meet the requirements of clean surface with a certain roughness, so as to improve the adhesion between the covering layer and the parts.