The corrosion damage of the metal has a considerable impact on the life span, reliability and service life of the valve. The effect of mechanical and corrosive factors on the metal greatly increases the total amount of wear on the contact surface. The total amount of wear on the friction surface of the valve during operation. During the operation of the valve, the frictional surface is worn and damaged due to the simultaneous mechanical action and the chemical or electrochemical interaction between the metal and the environment. For valves, the climatic conditions of their pipelines are complicated; the presence of hydrogen sulfide, carbon dioxide and certain organic acids in media such as oil, natural gas, and oil layer water increases the destructive power of the metal surface and quickly loses its ability to work.
Corrosion of the valve is usually understood as the damage to the metal material of the valve under the action of a chemical or electrochemical environment. As the corrosion phenomenon occurs in the spontaneous interaction between the metal and the surrounding environment, how to isolate the metal from the surrounding environment or use more non-metallic synthetic materials has become a common concern of people.
Since the chemical corrosion of metals depends on the temperature, the mechanical load of the friction parts, the sulfide contained in the lubricating material and its acid resistance, the duration of contact with the medium, the catalysis of the metal on the nitriding process, and the corrosion resistance The conversion speed of the molecules of the substance to the metal and so on. Therefore, the anti-corrosion methods (or measures) of metal valves and the application of synthetic material valves have become one of the themes of current research in the valve industry.
