Anti-corrosion technology for coating epoxy ceramic on cast iron pipe fitting

Abstract

The invention discloses an anti-corrosion technology for coating epoxy ceramic on a cast iron pipe fitting, which belongs to the technical field of corrosion of inside and outside of the pipe fitting. The anti-corrosion technology adopts the following steps: A) carrying out shot peening treatment of the pipe fitting to obtain the pipe fitting which is not rusted and oxidized on inner and outer surfaces; B) drying the pipe fitting processed in the step A in an oven at 80-120 DEG C, and C) coating the pipe fitting obtained in the step B for three times to obtain the product. The anti-corrosion technology disclosed by the invention has the advantages of abrasive resistance, small friction coefficient, uniform compactness, firm cohesiveness, resistance to chemical corrosion medium, high electrical insulating property and cathode protection, and meanwhile, the coating has the advantages of being clean and sanitary without a secondary pollution, environment-friendly and energy-saving, and wide in application.

Description

technical field [0001] The invention discloses an anticorrosion process for coating epoxy ceramics on cast iron pipe fittings, and particularly belongs to the technical field of internal and external anticorrosion of pipe fittings. Background technique [0002] The traditional anti-corrosion process of cast iron water supply pipe fittings generally uses zinc-rich paint or asphalt as the external anti-corrosion, and the inner wall uses cement mortar as the inner lining layer. This traditional anti-corrosion process has not adapted to the new anti-corrosion requirements. , transportation, and installation process are exposed to the sun and rain, and the environment is harsh. Due to the difference in thermal expansion coefficient between the cement mortar layer and the cast iron, the strength of the inner lining layer is limited, and cracks, detachment and other defects are prone to appear, which will affect the service life. At the same time, the surface of the mortar layer...

AI Technical Summary

Problems solved by technology

[0002] The traditional anti-corrosion process of cast iron water supply pipe fittings generally uses zinc-rich paint or asphalt as the external anti-corrosion, and the inner wall uses cement mortar as the inner lining layer. This traditional anti-corrosion process has not adapted to the new anti-corrosion requirements. , transportation, and installation process are exposed to the sun and rain, and the environment is harsh. Due to the difference in thermal expansion coefficient between the cement mortar layer and cast iron, the strength of the inner lining layer is limited, and cracks, detachment and other defects are prone to occur, which will affect the service life. At the same time, the surface of the mortar layer is rough. Increase the flow resistance of the water flow in the pipeline and affect the water flow

[0003] The disadvantages of external anti-corrosion are: the adhesion of ordinary zinc-rich layer paint and asphalt layer on the outer wall of pipe fittings is relatively low, and it is easy to bump and damage the thickness of the coating during storage, transfer, and construction, which directly affects the service life of the coating.

[0005] 1. Use high-pressure gas to mix water and sand to wash, but the cleaning of the pipeline cannot be thorough;

[0006] 2. The outer wall of the pipeline cannot be cleaned and coated;

[0007] 3. Although the cyclone is used, the thickness of the coating is still uneven;

[0008] 4. In the case of short pipelines, there are potential safety hazards