Under What Circumstances Is The Sanitary Butterfly Valve Not Easily Corroded?

Sanitary Butterfly Valve Under what circumstances is it not easy to be corroded?

Most of the materials of sanitary butterfly valves are made of stainless steel, which has the ability to resist atmospheric oxidation (rustproof) and also has the ability to resist corrosion in media containing acid, alkali and salt. The corrosion resistance of stainless steel butterfly valves varies with the chemical composition of the stainless steel material itself, the conditions of use and the type of environmental media. For example, 304 stainless steel butterfly valves have excellent rust and corrosion resistance in dry and clean atmosphere, but they will soon rust in sea fog containing a lot of salt in coastal areas, while 316 stainless steel butterfly valves perform well.

Sanitary butterfly valves rely on a thin, solid, fine and stable chromium-rich oxide film (protective film) formed on the surface of stainless steel materials to prevent the continued infiltration and oxidation of oxygen atoms, thereby obtaining the ability to resist rust. Once this film is continuously damaged for some reason, oxygen atoms in the air or liquid will continue to infiltrate or iron atoms in the metal will continue to separate to form loose iron oxide, and the sanitary butterfly valve will continue to rust.

The chromium content of general stainless steel is generally not less than 12%, and the highest can even reach 18%. After adding chromium and other elements to stainless steel, the properties of the steel can be changed, and a dense oxide protective film can be formed more easily on the surface of the steel, thereby greatly improving the corrosion resistance of the stainless steel butterfly valve.