译文：

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原文：
Valve corrosion, is usually understood as the valve metal material in the chemical or electrochemical environment under the action of the damage suffered. As the "corrosion" phenomenon seen in the metal spontaneous interaction with the surrounding environment were, and how the metal with the surrounding environment isolated or more of the use of non-metallic composite materials is the focus of anti-corrosion. Of the valve body (including the valve cover), occupying most of the weight of the valve, but also in regular contact with the media, so use the valve, often starting from the valve body material. Valve no more than two forms of corrosion, or chemical corrosion and electrochemical corrosion. It is the corrosion rate determined by the medium temperature, pressure, chemical properties as well as the body material corrosion resistance. Corrosion rate can be divided into six, etc.: 1, complete corrosion: the corrosion rate of less than 0.001 mm / year; 2, very corrosion: the corrosion rate from 0.001 to 0.01 mm / year; 3, anti-corrosion: corrosion rate from 0.01 to 0.1 mm / year; 4, yet corrosion: the corrosion rate from 0.1 to 1.0 mm / year; 5, corrosion resistance and poor: the corrosion rate from 1.0 to 10 mm / year; 6, non-corrosion: the corrosion rate of greater than 10 mm / year. Valve anti-corrosion, mainly the correct selection of material. Although the information is very rich in anti-corrosion, but whether the election was appropriate, or not easy, because the corrosion problem is very complex, such as sulfuric acid in the low concentration of very corrosive to the steel at high concentrations makes steel produced passivation film, anti-corrosion; hydrogen only at high temperature and pressure under which the corrosion of steel show a very strong chlorine corrosion in the dry state, is not large, but when a certain humidity, corrosion can be very strong, and many materials can be used not . Select Valve material difficulty, but also because not only consider the corrosion problems, and must consider the pressure temperature capabilities, whether it is economically reasonable and ease of purchase and other factors. Therefore, we must carefully is. Second, is to take lining measures, such as lining of lead, lining aluminum, plastic lining, lining and all kinds of natural rubber, synthetic rubber and so on. Such as the medium conditions permit, that's an economical way. Once again, the pressure, temperature is not high case, the main valve to do with the non-metallic materials, can often be very effective to control corrosion. In addition, the valve body outer surface is also exposed to atmospheric corrosion of steel material to painting in general to protection.