in air pollution (for example, contain large amounts of sulfide World Steel Pipe News , carbon dioxide, nitrogen oxide atmosphere), the case of condensation of water to form sulfuric acid, nitric acid, acetic acid solution point, caused by chemical corrosion.
waterfront area you want to use 316 stainless steel 316 material resistant to seawater corrosion.
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.
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.
on the market, some chemical constituents of stainless steel pipe can not comply with national standards, to reach the 304 requirements. Can also cause rust, which requires the user to carefully select the products of reputable manufacturers.
Brown rust (point) when the surface of stainless steel pipe, people are surprised: that "the stainless steel is 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 was not rust, because it contains "chrome". Usually chromium content must be 13 to 25 percent (by weight) in order to change the steel surface is oxidized. But stainless steel is not really will not rust, if observed with a microscope, its surface is actually a lot of small rust spots; A closer look at these spots contain sulfur, sulfur exists in no steel manufacturing process to avoidWorld Steel Pipe . Not originally lead to corrosion of the sulfur atoms in the water to become sulfuric acid, but in stainless steel, the cooling process, the chromium in the steel to move to some place, some to replace the position of manganese in the manganese sulfide, which causes lower in the chromium content in the vicinity, when the chromium content of less than 13%, stainless steel will rust. 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. 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 their daily lives more common are the following categories:
1 stainless steel surface deposition of dust containing other metals or heterogeneous metal particles attachments, in the humid air between fixtures and stainless steel condensate, the two together into a micro-battery, caused by the electrochemical reaction, the protective film damage, known that the electrochemical corrosion.
3. Stainless steel surface adhesion containing acid, alkali, salts (such as wall decoration alkaline, lime splash), causing localized corrosion.
above can 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, will not be corroded, we recommend: