Stainless steel why it is rusty brown rust (point) when the surface of stainless steel pipe, it is surprised: "stainless steel does not rust, rust is not stainless steel, may be steel appear the 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, also has a corrosion-resistant acid, alkali, salt medium capacity --- 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. 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 the 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 form of destruction of a lot more common in everyday life: a stainless steel surface deposition of dust containing other metals or attachments of heterogeneous metal particles in moist air, fixtures between the stainless steel condensate, the two together into a micro-battery, caused by the electrochemical reaction, the protective film damage, known that the electrochemical corrosion. 2 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. The above situation may be caused by the destruction caused by corrosion of the stainless steel surface protection film. Therefore, in order to ensure that the metal surface is permanently bright, no rust, we recommend: must always be on the decorative surface of stainless steel cleaning scrub, removal of fixtures, the elimination of lead to the modification of external factors. Waterfront to use 316 stainless steel 316 material resistant to seawater corrosion. (3) the chemical composition of some stainless steel pipe on the market can not meet the appropriate national standards, amounting to less than 304 requirements. Can also cause rust, which requires the user to carefully select the products of reputable manufacturers.