General valve used for certain occurs when the body corrosion situation, so we should how to prevent this situation? How to make the valve with a longer?
Corrosion control valve of the valve, the valve is usually understood as the metal material in the chemical or electrochemical environment effect under the damage. As the "corrosion " phenomenon seen in the metal and spontaneous interaction among the surrounding environment, how the environment around the metal with the use of isolation or more non-metallic composite materials, corrosion is the key. Valve body ( including the valve cover ), occupying most of the weight of the valve, but also in regular contact with the media, so the selection of valves, often starting from the valve body material. Corrosion but body in two forms, namely, chemical corrosion and electrochemical corrosion. Electric three regulating valve corrosion rate determined by the medium temperature, pressure, chemical properties and corrosion resistance of the material body. The corrosion rate can be divided into six:
1> completely corrosion: corrosion rate of less than 0.001 mm / year;
2> corrosion: corrosion rates of 0.001 to 0.01 mm / year;
3> corrosion: corrosion rates of 0.01 to 0.1 mm / year;
4> is corrosion: corrosion rates of 0.1 to 1 mm / year;
5> poor corrosion resistance: corrosion rates of 1 to 10 mm / year;
6> no corrosion: corrosion rate is greater than 10 mm / year.
Corrosion is very rich, but can choose properly, or not easy, because the valve corrosion problem is very complex, such as sulfuric acid at low concentrations is very corrosive to steel, makes steel at high concentrations produce passivation film, can prevent corrosion; hydrogen only at high temperature and pressure under display the corrosion of steel is very strong, chlorine corrosion in dry state is not big, but there is some corrosion when moisture is very strong, many materials are not used. Select valve material difficulty, lies not only consider the corrosion problem, and must consider the ability to withstand temperature, whether it is economically reasonable, is it easy to buy and other factors. So we must carefully is. Followed by the lining measures, such as lining of lead, aluminum lining, the lining of engineering plastics, lining of natural rubber and synthetic rubber. If the medium conditions permit, this is an economical method. Again, the pressure, temperature is not high case, using non-metallic single-seat cut off valve body materials, can often be very effective to control corrosion. In addition, the valve body surface is also exposed to atmospheric corrosion, general steel materials to paint to protection.
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