Why does stainless steel skateboard bearings rust?

Why does stainless steel skateboard bearings rust? When brown rust spots (spots) appear on the surface of stainless steel tubes, people are amazed: "stainless steel skateboard bearings are not rusted, and rusted is not stainless steel skateboard bearings, maybe It's the steel that's the problem." In fact, this is a one-sided misconception about the lack of understanding of stainless steel. Stainless steel skateboard bearings will also rust under certain conditions.

Stainless steel skateboard bearings have the ability to resist atmospheric oxidation—that is, rust resistance, and also have the ability to resist corrosion in media containing acids, alkalis and salts—that is, corrosion resistance. However, the size of its anti-corrosion ability varies with the chemical composition of its steel itself, the state of mutual addition, the conditions of use and the type of environmental media. For example, 304 stainless steel bearings have absolutely excellent anti-corrosion ability in a dry and clean atmosphere, but if they are moved to the seaside area, they will rust quickly in the sea fog containing a lot of salt; and 316 stainless steel bearings performed well. Therefore, it is not any kind of stainless steel skateboard bearings that can resist corrosion and rust in any environment.

Stainless steel skateboard bearings are a very thin, firm and stable chromium-rich oxide film (protective film) formed on the surface to prevent the continuous infiltration and oxidation of oxygen atoms, and obtain the ability to resist rust. Once the film is damaged continuously for some reason, the oxygen atoms in the air or liquid will continue to infiltrate or the iron atoms in the metal will continue to separate out, forming loose iron oxide, and the metal surface will be continuously corroded.

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