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Where is the cause of the stainless steel rust, do you know?

by:J&T     2020-06-19
Stainless steel in daily life is very common metal materials, stainless steel kitchen utensils, stainless steel household products, stainless steel in the chemical industry chemical pumps, stainless steel pipe and so on stainless steel equipment, was deeply loved by the masses of users, with its beautiful appearance, corrosion resistance of stainless steel characteristics, the advantages of not easy to damage. But when the stainless steel tube surface appear brown rusty spot point, people will surprise: why & other; Stainless steel & throughout; Will rust? Rust that is throughout the &; Stainless steel & throughout; ? There was a problem in material? Actually, this is of stainless steel is a kind of unilateral mistake, because the stainless steel under certain conditions will rust. Stainless steel has the ability of resistance to atmospheric oxidation - - - - - - - - - - - - - Namely, stainless, also has in the medium containing acid, alkali, salt is the ability of corrosion - - - - - - - - - - - - - The corrosion resistance. But the size of its ability to resist corrosion was with the chemical composition of steel itself, and each state, using conditions and environmental medium type and change. Such as material 304 stainless steel, in a dry clean atmosphere, have absolute good corrosion resistance, but it will be moved to the coastal areas, in contains a great deal of sea salt fog, will soon be rusty; While material 316 well. So, not any kind of stainless steel, in any environment corrosion, no rust. Stainless steel protective film will also be destroyed stainless steel is formed on the surface of a layer of a very thin and fine and stable solid rich chromium oxide film ( Protective film) To prevent the oxidation of oxygen infiltration, continue, and ability to resist corrosion. Once you have some reason, the film has been continuously destroyed and air or oxygen atoms in the liquid iron atoms will constantly infiltration or metal separation out unceasingly, forming loose iron oxide, metal surface are also constantly rust. The surface membrane damage in the form of many, see more in daily life has the following several kinds: 1, the stainless steel surface adhesion containing acid, alkali, salt substances ( Like to decorate the walls of caustic soda and lime water splash) , cause local corrosion. Where there is pollution in the air ( Such as contains a lot of sulfur, oxidation of carbon, nitrogen oxide atmosphere) , encounter condensed water to form sulfuric acid, nitric acid, acetic acid, liquid, chemical corrosion. 3, deposited on the surface of the stainless steel contain other metal elements of attachments, or heterogeneous metal particles of dust in the humid air, attachments and stainless steel, the condensed water between the both together as a micro battery, triggers the electrochemical reaction, protective film is damaged, to call the electrochemical corrosion. 4, stainless steel surface adhesion organic juice ( Such as vegetables, noodle soup, sputum, etc. ) , under the condition of water is oxygen, organic acid, organic acid to for a long time and are on the surface of the metal corrosion.
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