Does stainless steel also rust

Does stainless steel also rust?

Stainless steel has the ability to resist atmospheric oxidation---that is, stainless steel. It also has the ability to corrode in media containing acid, alkali, and salt, that is, corrosion resistance. However, its corrosion resistance changes with the chemical composition of the steel itself, its additive state, usage conditions and environmental medium types.

There are many ways in which the surface film is damaged, and the common ones are as follows: Stainless steel relies on the formation of an extremely thin, strong, fine, and stable chromium-rich oxide film (protective film) on its surface to prevent the continued penetration 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 penetrate or iron atoms in the metal will continue to separate out, forming loose iron oxide, and the metal surface will be continuously corroded. There are many forms of damage to this surface film, and the common ones are as follows:

1. Dust containing other metal elements or attachments of heterogeneous metal particles accumulate on the surface of stainless steel. In humid air, the condensed water between the attachments and stainless steel connects the two into a micro-battery, triggering an electrochemical reaction. , the protective film is damaged, which is called electrochemical corrosion.

2. Organic juices (such as vegetables, noodle soup, phlegm, etc.) adhere to the surface of stainless steel. In the presence of water and oxygen, they form organic acids. For a long time, the organic acids will corrode the metal surface. 3. The surface of stainless steel contains acid, alkali, and salt substances (such as alkaline water and lime water splash on the wall decoration), causing local corrosion.