Difficulties in choosing valve body materials

Corrosion of a valve is generally understood to be the damage of a valve metal material under the action of a chemical or electrochemical environment. Since 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 is the focus of corrosion prevention.
The valve body (including the valve cover) occupies most of the weight of the valve and is in constant contact with the medium, so the valve is often used from the valve body material.
The anti-corrosion of the valve body is mainly the correct selection of materials. Although the anti-corrosion information is very rich, it is still not easy to choose the right one because the problem of corrosion is very complicated. For example, sulfuric acid is very corrosive to steel at low concentration, and steel is produced when the concentration is high. Passivation film can prevent corrosion; hydrogen only shows high corrosiveness to steel under high temperature and high pressure. Corrosion performance is not great when chlorine gas is in dry state, and corrosion performance is strong when there is certain humidity. Many materials cannot be used. .

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