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There are many materials available for electric butterfly valves in the market, offering a wide range of choices. However, when making a selection, it is important to ensure that the chosen material is appropriate. Special attention should be paid to corrosion-resistant materials, as this aspect can be somewhat complex. Below, I will explain more about this to you. For example, sulfuric acid is highly corrosive to steel at low concentrations, while at high concentrations it forms a passivation film on the steel that prevents corrosion ； Hydrogen only exhibits strong corrosivity toward steel under high temperature and pressure; chlorine has little corrosive effect when it is in a dry state, but its corrosivity is high when there is some humidity, rendering many materials unsuitable for use. The difficulty in selecting valve body materials lies in the fact that one cannot consider only corrosion issues; factors such as pressure and temperature resistance, economic viability, and ease of procurement must also be taken into account. So one must put heart into it. Next are lining measures, such as lead lining, aluminum lining, engineering plastic lining, natural rubber lining, and various synthetic rubbers. If the medium conditions permit, it is indeed a cost-saving method. Under conditions of low pressure and temperature, using non-metals as the material for the valve body can often effectively prevent corrosion. In addition, the outer surface of the valve body is also subject to atmospheric corrosion; generally, steel materials are protected by painting.