Prevention of pneumatic valve body corrosion protection methods

corrosion of pneumatic valve, pneumatic valve is often understood as metal materials in the chemical or electrochemical environment under the action of the damage. As a result of 'corrosion' phenomena appeared in the metal and the surrounding environment of spontaneous interaction, how the metal with the surrounding environment or more isolated from the use of non-metallic composite material, is the key point of anti-corrosion. Pneumatic valve pneumatic valve body (
Including pneumatic valve cover, occupy most of the weight of the pneumatic valve, and is often contact with the medium, so choose pneumatic valves, often from pneumatic valve body material.
pneumatic valve body corrosion, comes in two forms, namely, chemical corrosion and electrochemical corrosion. The corrosion rate of it depends on the medium temperature, pressure, chemical properties and corrosion resistance of pneumatic valve body material. Corrosion rate can be divided into six such as:
and complete corrosion resistant: corrosion rate below. Mm/year;
and corrosion resistant, corrosion speed. To. Mm/year;
, corrosion resistant, corrosion speed. To. Mm/year;
and is corrosion resistant, corrosion speed. To. Mm/year;
, poor corrosion resistance: corrosion speed. To mm/year;
, corrosion resistant, corrosion rate is greater than the mm/year.
pneumatic valve anti-corrosion, mainly is correct to choose material. Although anticorrosion materials is very rich, but can choose appropriate, or not easy thing, because the problem of corrosion is very complex, such as sulfuric acid at low concentrations to steel corrosion resistance, high concentration, make steel passivation membrane, corrosion resistance; To show only under high temperature and high pressure hydrogen corrosion of steel is very strong, chlorine gas in the dry state when corrosion is not large, with a certain humidity, strong corrosion performance of many materials can't use. Choose pneumatic valve body material difficulty, is not only considered corrosion problem, the pressure must be considered and heat-resistant ability at the same time, the economically reasonable, whether the purchase easy and other factors. So you have to is in the heart.
secondly lining measures, such as lead lining, lining aluminum, engineering plastics, lining natural rubber and various synthetic rubber, etc. Such as medium conditions permit, it is a way to save.
once again, in the case of pressure, temperature is not high, made from non-metallic pneumatic valve body material, often can effectively control the corrosion.
in addition, the pneumatic valve body surface by atmospheric corrosion, general steel material is to brush paint protection.