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Will stainless steel rust on contact with shrapnel?

by:Fortuna     2021-05-08
After more than 10 years of research in the field of metal stamping processing, metal stamping manufacturers mainly provide stainless steel contact shrapnel, precision metal contact processing, and metal terminal processing. Now it has become a number of Fortune 500 companies to reach long-term cooperation.

When brown rust spots appear on the surface of stainless steel contact shrapnel, many people will feel surprised that stainless steel does not rust, and it is not stainless steel that rusts. It may be that there is a problem with the steel. In fact, stainless steel will rust under certain conditions.

Stainless steel has the ability to resist atmospheric oxidation, which is called non-corrosion. It also has the ability to corrode in media containing acids, alkalis, and salts—that is, corrosion resistance. However, the size of the corrosion resistance varies with the chemical composition of the steel itself, the processing state of the contact shrapnel, the use conditions and the type of environmental media. For example, 304, in a dry and clean atmosphere, the anti-corrosion ability is very good, if it is moved to the beach area, in the sea fog containing a lot of salt, it will quickly rust; while 316 performs well. Therefore, it is not any kind of stainless steel, which can resist corrosion and rust in any environment.

The stainless steel metal contact shrapnel is a very thin, strong, dense and stable chromium-rich oxide film (protective film) formed on the surface of the material to prevent the oxygen atoms from continuing to penetrate and continue to oxidize, thereby obtaining anti-corrosion performance. Once this protective film is continuously attacked by a certain substance, oxygen atoms in the air or liquid will continue to infiltrate or iron atoms in the metal will continue to separate out, forming loose iron oxide, and the metal surface will continue to be rusted. There are many forms of damage to the surface film, such as dust, metal particles, and adhesion of organic liquids.
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