Stainless steel is also why the rust? Brown rust (point) when the surface of stainless steel pipe, people are surprised: that stainless steel is not rust, the rust would not stainless steel, is steel there is a problem. " In fact, this lack of understanding of the stainless steel one-sided view of the error. Stainless steel will rust under certain conditions.
The stainless steel resistant to atmospheric oxidation capacity --- that is, stainless steel, but also is the medium of acid, alkali, salt corrosion ability --- that is corrosion resistance. But the size of its corrosion resistance with the steel itself, chemical composition, plus each state change, the use of conditions and the environmental media types. Such as 304 steel pipe in a dry and clean atmosphere, absolutely excellent resistance to corrosion, but will move it to the waterfront, contains a lot of salt sea-mist, soon rust; 316 steel pipe performance is good. Therefore, it is not any kind of stainless steel, in any environment, ability corrosion, no rust.
1.Stainless steel and solid to rely on a very thin layer formed on the surface fine and stable chromium-rich oxide film (protective film), to prevent the oxygen atoms continue to penetrate and continue to oxidation, anti-corrosion ability. Once there is some reason, this film was to destroy, air or liquid oxygen atoms will continue to infiltrate or metal from the iron atom analysis from, the formation of loose iron oxide and metal surfaces will be subjected to constant corrosion. This surface film of the destruction of many forms, there are several more common in everyday life:
2.Stainless steel surface deposition of dust containing other metals or heterogeneous metal particles attachments between fixtures and stainless steel in moist air, condensate, and the two together into a micro-battery, caused by the electrochemical reaction protective film is damaged, known that the electrochemical corrosion.
3. stainless steel surface adhesion of the organic juice (such as vegetables, soup, sputum, etc.), water oxygen, constitutes organic acids, a long time organic acid corrosion of metal surfaces.
Stainless steel surface adhesion containing acid, alkali, salts (such as wall decoration alkaline, lime splash), causing localized corrosion.
4. in the polluted air (containing large amounts of sulfide, carbon dioxide, nitrogen oxide atmosphere), case of condensation of water to form sulfuric acid, nitric acid, acetic acid solution point, caused by chemical corrosion.
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