Stainless steel corrosion

Why is stainless steel rusting? When brown rust spots (dot) appear on the surface of stainless steel pipes, people are surprised that it is not stainless steel. It may be a problem with steel. In fact, this is a one-sided misconception about the lack of understanding of stainless steel. Stainless steel will also rust under certain conditions. Stainless steel has the ability to withstand corrosion in media containing acids, bases, and salts—that is, corrosion resistance. However, its anti-corrosion ability is absolutely excellent in corrosion resistance with its chemical composition, added state, use conditions and dry and clean atmosphere, but it is moved to the seaside area and contains a lot of salt. In the sea fog, the steel pipe performed well. Therefore, not any stainless steel can resist corrosion and rust under any environment.

Stainless steel is formed by a very thin, sturdy and fine-grained layer that continues to infiltrate and continue to oxidize, thereby obtaining the ability to resist rust. Once for some reason, the film is continuously destroyed, air or liquid will continue to infiltrate or iron atoms in the metal will be continuously separated, forming loose oxygen and rusting. A stainless steel can have good corrosion resistance in many media, but in another medium, it may be corroded due to low chemical stability. Therefore, a stainless steel is unlikely to resist corrosion of all media.