It is well known that the corrosion damage of metals has a considerable effect on the duration, reliability and service life of the valve. The effect of mechanical and corrosive factors on metal greatly increases the total wear of the contact surface.
The total amount of wear on the surface of the friction during the operation of the valve. During the operation of the valve, the friction surface is worn and destroyed by the simultaneous mechanical action and the chemical or electrochemical interaction between the metal and the environment.
For valves, the weather conditions of their pipelines are complex, and the presence of hydrogen sulfide, carbon dioxide and some organic acids in the medium of oil, natural gas and reservoir water makes the surface of the metal more destructive and thus rapidly loses its ability to work. Because the chemical corrosion of metals depends on the temperature, the mechanical load of the friction parts, the sulfide in the lubricating material and the stability of the acid, the duration of contact with the medium and the catalysis of the metal to the nitriding process, the conversion rate of the molecule of the corrosion-etching material to the metal, etc.
Therefore, the corrosion method of metal valves (or measures) and the application of synthetic material valves, has become one of the topics of the current research of valve industry. Corrosion of metal valves, can be understood as a metal valve coated to protect their corrosion-resistant conditions of protection (such as paint, pigments, lubrication materials, etc.), so that valves whether in the manufacture, preservation, transport or in the use of all the process is not corroded.
The method of corrosion prevention of metal valves depends on the required protection period, transport and preservation conditions, valve structural characteristics and materials, of course, to consider the economic effect of lifting anti-corrosion. There are 4 kinds of anti-corrosion methods of metal valves and their parts: 1, the volatile corrosion inhibitor into the atmosphere of the steam (with blocking paper wrap, blow suppression air through the product chamber, etc.). 2. Use the water and alcohol solution that is being blocked. 3, the anti-corrosion (protection) material coating on the surface of the valve and its parts. 4. Coating the thin layer of the film or polymer that is being blocked on the surface of the valve and its parts. (Note: The current valve production enterprises, widely used lubrication materials and water to prevent the flow of corrosion.) Second, the application of materials valve composite valve, in many corrosive conditions are superior to metal valves, first is corrosion resistance, followed by net weight, as to its strength, depends on the shape, arrangement and number of fiber reinforced. (Generally, the greater the percentage of fiber, the greater the strength of the composite material.) ）