The rusting of electric doors is not because the products are made of inferior materials, but because the electric doors are generally used in outdoor environment, even the best stainless steel will be slowly rusted off.

 

It is generally believed that stainless steel is not rusty, rust is not stainless steel, it may be steel problems. In fact, this is a one-sided wrong view of the lack of understanding of stainless steel. Stainless steel will rust under certain conditions. Stainless steel has the ability to resist atmospheric oxidation, that is, rust resistance, but also has the ability to resist corrosion in the medium containing acid, alkali and salt, that is, corrosion resistance. However, the corrosion resistance of the steel varies with its chemical composition, additive state, service condition and environmental medium type. For example, 304 steel pipe has excellent corrosion resistance in dry and clean atmosphere, but when it is moved to the coastal area, it will soon rust in the sea fog containing a lot of salt, while 316 steel pipe performs well. Therefore, not any kind of stainless steel, in any environment can be resistant to corrosion, rust, stainless steel electric door does not rule out this situation.

 

Stainless steel is formed on the surface of a very thin and solid fine stable chromium rich oxide film (protective film), to prevent oxygen atoms continue to penetrate, continue to oxidize, and obtain the ability of corrosion resistance. Once there is some reason, the film is constantly damaged, oxygen atoms in the air or liquid will continue to penetrate, or iron atoms in the metal will continue to separate out, forming loose iron oxide, and the metal surface will be constantly corroded. There are many forms of destruction of the surface film.