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Coating is based on epoxy resin, the coating has good machinability, the processed coating remains the same physical and chemical properties, its performance reached the international advanced level, and access to a number of national patents, Become a very promising application of a wide range of new coatings. At present, the coating has been applied to heavy corrosion pipes and fittings in industries such as petroleum, chemical engineering, metallurgy, coal mining, paper making, sugar refining, chemical fiber, electric power and mariculture, such as conveying pipes of acid, alkali, salt and oil, Tanks, pumps, valves, hydraulic props and other equipment corrosion-resistant, abrasion-resistant protective coating has achieved significant economic and social benefits. Coating can make ordinary cast iron and carbon steel centrifugal pumps, liquid ring pumps, compressors and other products with very good corrosion resistance, with good market prospects. Spraying paint on pump products is generally applied to the pump over-current components, the coating should be covered with the media in direct contact with the surface of the parts. Such as centrifugal pump impeller, pump body, pump cover, seal ring, impeller nut and other parts, vacuum pump body, impeller, distribution board, side cover and other parts. Due to the pump parts connected to the flow is often the size of the relationship with the need to spray parts after the parts with the processing size to fit. Therefore, the pump parts spraying process and spraying parts of the processing process to determine the paint can be successfully applied to pump the key products. Spray paint parts of the basic process is non-surface with the site, the uneven thickness of the coating will not affect the use of parts. For example, the sprayed surface of the part is the mating surface of the part and the part. In order to ensure the assembly size of the part and the clearance of the fitted part with the seal, the surface of the sprayed surface must be machined to ensure the dimensional accuracy. Ensure that the size of the assembly site with the same relationship. Normally, the process flow of the parts before spraying is the same as that of the normal parts. However, the size of the sprayed surface must be machined to the size of the coating minus the thickness before spraying. The outer surface should be reduced in size and the inner surface should be increased in size. Spray coating coating processing is the key part of the pre-processing fixture correction and allowance determination. In order to maintain the thickness of parts coating processing uniformity, before processing the metal parts of the surface to be corrected, and measured the coating allowance. Before spraying the parts, according to the structural features of the parts, a non-sprayed machined surface was selected as the calibration datum plane and the measured dimensions of the calibrated datum surface and the coated surface were accurately measured before spraying. Spraying parts, the coating processing, you can calibrate the reference plane according to the table to find parts, and calculate the coating allowance. For the entire sprayed part, since all the surfaces of the part are coated, only the thickness of the coating at several points can be measured by a coating thickness meter and the parts to be tested can be calibrated using the dial gauge to calculate the thickness of the part to be coated Layer of processing margin, and then machining method of processing spray coating to the size required by the drawings. Conclusion Grasp the coating in the pump coating process features to ensure that the coating in the pump product applications, greatly expanded the scope of application of the pump under special media conditions, reducing the cost of equipment, reducing equipment investment costs related industries, Save scarce precious metals resources, has made very obvious economic and social benefits.