Why Does Stainless Steel Rust?

Why does stainless steel also rust? When brown rust spots (dots) appear on the surface of stainless steel pipes, people are surprised: "Stainless steel does not rust. If it gets rusty, it is not stainless steel anymore. There may be something wrong with the steel." In fact, this is a one-sided wrong view due to lack of understanding of stainless steel. Stainless steel can also rust under certain conditions.

Stainless steel has the ability to resist atmospheric oxidation-that is, it is rustless, and also has the ability to resist corrosion in media containing acids, alkalis, and salts-that is, corrosion resistance. However, its corrosion resistance changes with the chemical composition of the steel itself, its protection status, usage conditions and environmental medium types. Like 304 steel pipes, in the atmosphere of dry cleansing, absolute good resistant to tarnishing ability is arranged. But if it is moved to riviera, in containing the sea fog of a large amount of salts, will soon get rusty; 316 steel pipes show excellent corrosion resistance. good. Therefore, not any kind of stainless steel can resist corrosion and rust in any environment.