Thus, it is difficult for the corrosive media to break the passivation film and further corrode the substrate c) The chromium content is three times higher in the passivation film than the substrate, making it become highly resistant in corrosion. There are three reasons for the corrosion resistance on stainless steel: a) The film is extremely thin, and it is only a few microns even the chromium content exceeds 10.5% b) The specific density of the passivation film is greater than the one of the matrixes. Therefore, when the film is damaged, it will form a new passivation film immediately. ![]() The another reason is the stainless steel forms a film during the corrosion when putting into aqueous solutions (electrolytes) – that’s why we need to do pickling and passivating for stainless steel pipe and fittings. There are two reasons for the passivation: one is that the stainless steel itself has the ability of self-passivation, and this ability will be stronger with the increasement of the chromium content, making it become rust-resistant. This film can prevent the stainless steel from corrosion in varieties of media, which is called passivation. The so-called passivation film is a thin film with Cr 2O 3. And the mechanism of corrosion resistance on stainless steel is the passivation film theory. ![]() Currently, the stainless steel sold in the market contains the element Cr, which can prevent the steel from being rusted. Stainless steel will get rusted, and it will form a kind of oxide on the surface. ![]() As a professional stainless steel pipe supplier, it has always been asked whether the stainless steel can rust ? Here is the answer: Stainless Steel Can Rust When talking of stainless steel, it always refers to austenitic stainless steel (300 Series Stainless Steel), which includes 304, 316L, 321 and so on.
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