Corrosion of pneumatic valve

corrosion of pneumatic valve, pneumatic valve is often understood as metal materials in chemical or electrochemical environment destruction. Because 'corrosion', in the surrounding environment of the metal and the phenomenon of spontaneous interaction to see, and how to metal with the surrounding environment, isolation or more non-metallic composite material, corrosion is the key. Pneumatic valve body (
Including pneumatic valve cover) , accounting for most of the weight of the pneumatic valve, but in contact with the media often, so often begins with a pneumatic valve body material choice.
corrosion body no more than two forms, namely, chemical and electrochemical corrosion. It depends on the medium temperature, pressure, chemical properties and corrosion rate of corrosion resistant materials. Corrosion rate can be divided into six: such as, completely corrosion resistant: less than. Mm/annual corrosion rate, very corrosion resistant, corrosion rate is zero. To. Mm/year, corrosion, corrosion rate is zero. To. Mm/year, is corrosion resistant, corrosion rate is zero. To. Mm/year, poor corrosion resistance: in. To mm corrosion rate per year, non-corrosive, of greater than mm/annual corrosion rate
the anti-corrosion mechanism, correct selection of main materials. Broadcasting although the corrosion data are abundant, but whether the information is correct, or not easy thing, because corrosion problem is very complex, for example, when the steel in low concentration of sulfuric acid corrosion resistance is very strong, steel production when high concentrations of ze passivation membrane, corrosion resistance, only under the high temperature and high pressure, shows very strong corrosion, hydrogen chloride corrosion in dry state is not big, but, when a certain humidity, corrosion resistance is strong, can use many materials. Select the difficulty of the pneumatic valve body material is not only considered corrosion problems, must consider to withstand temperatures, whether it is economically rational, factors such as whether to purchase. Therefore, we must be careful.