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Corrosion of metal valves, corrosion of valve body and protection measures
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The valve body of the valve (including the valve cover); it occupies most of the components of the valve; it is also in the constant touch with the medium; so the valve is selected; often the body data is moved.
Corrosion of the valve body is not only two ways; namely chemical corrosion and electrochemical corrosion. Its corrosion rate is determined by the temperature, pressure, chemical function of the medium and the corrosion resistance of the valve body data. The corrosion rate can be divided into six:
1, thorough corrosion resistance: corrosion rate is less than 0. 001 mm / year,
2, extreme corrosion resistance: corrosion rate 0. 001 to 0. 01 mm / year,
3, corrosion resistance: corrosion rate of 0. 01 to 0. 1 mm / year,
4, still resistant to corrosion: corrosion rate of 0. 1 to 1.0 mm / year,
5, poor corrosion resistance: corrosion rate of 1.0 to 10 mm / year,
6, non-corrosion resistance: corrosion rate is greater than 10 mm / year.
Corrosion protection of the valve body; mainly correct selection of materials. Although the anti-corrosion information is very rich, it can be selected properly; it is still not simple work; the problem of corrosion is very messy; for example, sulfuric acid has a low concentration on Steel. It is very corrosive; when the concentration is high, the steel material has a passivation film; it can prevent corrosion, and the hydrogen is only corrosive to the steel only under high temperature and high pressure; when the chlorine gas is in a dry state, the corrosion function is not large; Corrosion function is very strong in certain humidity; many materials can not be used. The difficulty in selecting valve body data is that it can not only consider the corrosion problem; it is necessary to think about the pressure and temperature resistance; whether it is economically reasonable; whether the procurement can be simple, etc. Elements. So it is necessary to use your heart.
The second is to adopt the fabric method; such as lead-lined, lining Aluminum, lining engineering plastics, lining natural rubber and various rubber components, etc., such as medium conditions; this is a saving method.
Again; in the case of low pressure and temperature; use non-metal to do the main body of the valve; often very effective in preventing corrosion.
In addition; the external appearance of the valve is also subject to atmospheric corrosion; usually steel materials are protected by brushing.
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