译文：
阀门的腐蚀，通常被理解为阀门金属材料在化学的或电化学的环境作用下所受到的破坏。由于“腐蚀”现象出现于金属与周围环境自发的相互作用当中，怎样将金属与周围环境相隔绝或更多的使用非金属合成材料，便是防腐蚀的重点。 阀门的阀体(包括阀盖)，占据阀门的大部分重量，又处在与介质的经常接触中，所以选用阀门，往往从阀体材料出发。 阀体的腐蚀不外两种形式，即化学腐蚀和电化学腐蚀。它的腐蚀速度决定于介质的温度、压力、化学性能以及阀体材料的抗腐蚀能力。腐蚀速度可分为六等： 1、xx耐蚀：腐蚀速度低于0.001毫米/年； 2、极耐蚀：腐蚀速度0.001至0.01毫米/年； 3、耐蚀：腐蚀速度0.01至0.1毫米/年； 4、尚耐蚀：腐蚀速度0.1至1.0毫米/年； 5、耐蚀性差：腐蚀速度1.0至10毫米/年； 6、不耐蚀：腐蚀速度大于10毫米/年。 阀体的防腐蚀，主要是正确选用材料。虽然防腐蚀的资料十分丰富，但能否选得恰当，还是不容易的事情，因为腐蚀的问题很复杂，例如硫酸在浓度低时对钢材有很大的腐蚀性，浓度高时则使钢材产生钝化膜，能防腐蚀；氢只在高温高压下才显示对钢材的腐蚀性很强，氯气处于干燥状态时腐蚀性能并不大，而有一定湿度时腐蚀性能很强，许多材料都不能用。选择阀体材料的难处，还在于不能只考虑腐蚀问题，同时必须考虑耐压耐温能力，经济上是否合理，购买是否容易等因素。所以必须用心才是。 其次是采取衬里措施，如衬铅、衬铝、衬工程塑料、衬xx橡胶及各种合成橡胶等。如介质条件许可，这倒是一种节约的方法。 再次，在压力、温度不高的情况下，用非金属做阀门主体材料，往往能十分有效地防制腐蚀。 此外，阀体外表面还受到大气腐蚀，一般钢铁材料都以刷漆来防护。
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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.
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