How to prevent the pneumatic ball valve from being corroded during steam transmission The pneumatic ball valve used in steam transmission is high temperature resistant, but the pneumatic ball valve will be oxidized and fall off under high temperature for a long time, thus affecting normal use. According to the sanitary standard, the pneumatic ball valve can not use anti-corrosion paint. Hengchang Pipeline has made in-depth research on the surface treatment process of the pneumatic ball valve for steam transmission, and has developed a new manufacturing process to treat the surface of the pneumatic ball valve for steam pipeline. The surface of the pneumatic ball valve is electrolytic treated chromium, that is, chromium plating is refined, The use of the anticorrosive coating can effectively prevent the falling off of the anticorrosive coating in the process of steam transmission.
Moreover, the new epoxy resin spraying process has more advantages than the chrome plating process in the application process. The existence of polar hydroxyl and ether bond in the molecular chain of epoxy resin makes it have high adhesion to various substances. The epoxy resin has low shrinkage when curing, and the generated internal stress is small, which can more effectively improve the problem that the anti-corrosion coating falls off during the steam transportation of the force transfer joint.
The corrosive environment of pneumatic ball valves can be divided into the following categories: 1. Dry corrosion. The pneumatic ball valve is corroded and oxidized in the normal temperature dry gas above the dew point, which is easy to generate very thin surface corrosion products, making the metal surface of the pneumatic ball valve tarnish, which is chemical corrosion.
2. High temperature oxidation, the metal surface of pneumatic ball valve is corroded in high temperature gas, sometimes producing thick oxide skin. Under thermal stress or mechanical stress, the oxide skin can peel off, which belongs to high temperature corrosion.
3. Wet corrosion, wet corrosion mainly refers to corrosion in wet environment and water containing medium. Most of the ambient temperature corrosion belongs to this type, which is electrochemical corrosion. Wet corrosion can also be divided into atmospheric corrosion, soil corrosion, microbial corrosion, corrosion in acid, alkali and salt solutions, and corrosion in industrial water; Corrosion in high-temperature and high-pressure water.
4. Corrosion in anhydrous organic liquids and gases. Corrosion in halogenated hydrocarbons, corrosion in alcohols, such as aluminum in ethanol, magnesium and titanium in methanol. This kind of corrosion medium is non electrolyte, and the corrosion reaction is the same whether it is liquid or gas. In these reactions, water actually acts as a corrosion inhibitor. However, the corrosion in oil organic liquid is mostly caused by the presence of trace water, which often contains salt and acid.