Wear and corrosion resisting centrifugal pump impeller coating layer and preparation method and application thereof

The invention discloses a wear and corrosion resisting centrifugal pump impeller coating layer and a preparation method and application thereof. The centrifugal pump impeller coating layer comprises a base layer coating and a surface layer coating. The base layer coating is prepared from, by weight, 11-15 parts of heavy calcium carbonate powder, 3-8 parts of aluminum oxide, 20-27 parts of octyl epoxy stearate, 10-16 parts of nano barium sulfate and 8-13 parts of dimethyl formamide. The surface layer coating is prepared from, by weight, 5-9 parts of silicon dioxide, 3-8 parts of zirconium silicate, 18-25 parts of epoxy resin, 14-20 parts of chlorinated paraffin, 20-27 parts of polypropylene resin and 5-10 parts of cobaltous hydroxide. All the raw materials in the base layer coating are placed into a ball mill to be subjected to ball milling, sieving and ultrasonic oscillation to obtain the base layer coating. The raw materials, except for the chlorinated paraffin, in the surface layer coating are ball-milled and sieved, then the chlorinated paraffin is added, ultrasonic oscillation and heat treatment are carried out, and therefore the surface layer coating is obtained. A centrifugal pump impeller is high in corrosion resistance and wear resistance, the service life is prolonged, the production process is stable and reliable, the coating layer construction cost is reduced, and construction is convenient.