the valve is often interpreted as in chemical or electrochemical corrosion damage under the condition of Industrial Valves metal materials. Because of the metal and the spontaneous interaction of surrounding environment in the 'corrosion' phenomenon, how to use metal from the surrounding environment or more non-metallic composite material is the key point of anti-corrosion. The valve body ( Including the cover) Account for most of the weight of the valve, and keep constant contact with the media, so the choice of valves usually begins from the valve body material. Body corrosion can be divided into two kinds of forms, chemical corrosion and electrochemical corrosion. The corrosion rate depends on the medium temperature, pressure, chemical properties and corrosion resistance of the body material. Corrosion rate can be divided into six levels: 1. Completely resistant to corrosion, corrosion rate, less than 0. 001 mm/year; 2. Extreme corrosion resistant corrosion rate is 0. 001-0. 01 mm/year; 3. Corrosion resistance: the corrosion rate of 0. 01 ~ 0. 1 mm/year; 4. Corrosion resistance: the corrosion rate of 0. 1 ~ 1. 0 mm/year; 5. Poor corrosion resistance: the corrosion rate of 1. 0 ~ 10 mm/year; 6. Corrosion resistance: corrosion rate is more than 10 mm/year. Anti-corrosion body mainly is the right choice material. Although the corrosion information is rich, but due to the corrosion problem is very complicated, it is not easy to choose suitable anticorrosive information. Sulfuric acid under the low concentration of steel, for example, has a strong corrosive, at high concentrations can produce passivation membrane, so as to prevent corrosion. Hydrogen under high temperature and high pressure only for steel has strong corrosive, chlorine dry non-corrosive to steel. And when there is a certain humidity, strong corrosion performance, many materials can't be used. Choice is the difficulty of the body material should not only consider the corrosion, also consider the pressure, temperature tolerance, economic rationality and procurement and other factors. So you have to be careful. Second, take the lead-lined, lining aluminum, engineering plastics, lining natural rubber, all kinds of synthetic rubber and other measures. If the medium conditions permit, it is a kind of economic way. Third, in the case of lower pressure and temperature, the use of non-metallic materials as the main material of the Industrial Valves can often be very effectively prevent the corrosion. In addition, the outer surface of the valve will be affected by atmospheric corrosion, usually coated steel to protect the valve.

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