The coating is based on epoxy resin based coating has good processability, cutting, coating processing after the physical and chemical properties remain unchanged, the performance index has reached the international advanced level, and won the national patents, has become a very promising application field of the new paint widely. At present, the coating has been heavy corrosion pipe and fittings used in petroleum, chemical, metallurgy, mining, paper, sugar, chemical, electric power, aquaculture and other industries, such as acid, alkali, salt transport, oil pipelines, storage tanks, pumps, valves, hydraulic and other equipment corrosion, wear corrosion protective coatings, has achieved remarkable economic and social benefits.

Coating can make the products of centrifugal pumps, liquid ring pumps, compressors and other products made of ordinary cast iron and carbon steel have excellent corrosion resistance, and has good market prospects. The paint coating on the pump is usually applied to the overflow parts of the pump, and the coating should be covered on the surface of the part directly contact with the medium. Such as centrifugal pump impeller, pump body, pump cover, seal ring, impeller nut and other parts, the pump body of the vacuum pump, impeller, distribution board, side cover and other parts. Because the connecting parts of the pump parts are often fitted with the size relationship, the matching parts of the parts after the spraying must be processed to the matching size. Therefore, the spraying process of the pump parts and the determination of the processing process of the parts after spraying are the key to the successful application of the coatings to the pump products.

The basic process of the spray coating for parts is that the surface is non - fit, and the thickness of the coating will not affect the use of the parts. As part of the spray surface is matched with the surface assembly of parts, in order to ensure the assembly size of parts, and assembly parts with parts of the space can meet the sealing requirements, must be machined to ensure the spraying surface accuracy requirements, ensure the assembly position of the dimension matching relationship unchanged.

Usually, the process flow before coating is consistent with the processing of normal parts, but the size of the spray surface must be processed before spraying to reduce the size of the coating thickness. The size of the surface should be reduced, and the inner surface should be increased. The key to the processing of the coating after spraying is the correction of the clamping and the determination of the machining allowance before the parts are processed. In order to keep the thickness of the coating in uniform thickness, the parts must be corrected by the metal surface before processing, and the processing allowance is calculated. Before spraying parts, according to the structural characteristics of the parts, a non sprayed machining surface is selected as the correction datum plane, and the relationship between the corrected reference plane and the measured size of the coated surface is accurately measured before spraying. When the parts are sprayed, when the coating is processed, the parts can be found on the basis of the calibration reference plane, and the processing allowance is calculated. For the whole spraying parts, because all the parts are coated surface, only through the coating thickness measuring instrument for measuring the coating thickness of some points, and according to the measured value with the dial gauge adjusting device and clamping parts, calculate the machining allowance for processing coating, method and machining process of spraying layer to the required size drawings.

The master coating in spraying characteristics of the pump, to ensure that the application of coating in the pump products, greatly expanding the scope of application of the pump in the special medium conditions, reduce the cost of equipment, reduce equipment investment cost related industries, saving the precious metal resources scarce, has achieved significant economic benefits and social benefits.

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