Why does stainless steel still rust?

Why stainless steel still rust? Stainless steel does not rust is a people's misunderstanding, in real life we ​​meet a lot of stainless steel products rust phenomenon, people without doubt, stainless steel rust is also called stainless steel?

In fact, the corrosion resistance of stainless steel is due to the addition of alloying elements (chromium, etc.) to the steel. In the oxidizing and corrosive media, chromium can quickly generate a dense passive film on the steel surface to prevent the metal matrix from being damaged. When the chromium content is more than 12.5%, a dense and stable passive film is formed, and the corrosion resistance is greatly enhanced. This is why the amount of chromium in stainless steel is more than 12%.

Stainless steel, as its name suggests, is stainless steel, but "stainless" here is relative, not absolute, as opposed to carbon steel. Stainless steel is not susceptible to rust, but it is not absolutely rust-free, but it is less susceptible to corrosion and rust than carbon steel in the same conditions and environment. In some coastal areas, the corrosion of stainless steel products is very serious. Why? Because the salt content in the air is high in the coastal areas, and the salt (chlorine ions) in the air has a corrosive effect on the metal protective layer, this is why coastal metal products Why is there a reason for the short service life in the Mainland? This phenomenon is called salt spray corrosion in environmental testing equipment, and the test equipment developed is the salt spray corrosion test box, which is specially used to simulate the change of performance of materials in this salt spray environment.

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