Corrosion of stainless steel flange
Stainless steel flange has the ability of corrosion in the medium containing acid, alkali and salt, namely corrosivity; it also has the ability of anti atmospheric oxidation, namely, rust resistance; however, the size of its corrosion ability varies with the chemical composition of the steel itself, the application conditions and the type of environmental media. For example, 304 stainless steel flange has certain corrosion ability in dry and clean environment, but when moved to the seaside area, it will quickly rust in the sea fog containing a lot of salt; 316 material has excellent function. So in any environment, not any kind of stainless steel flange can not rust.
The surface of stainless steel flange is composed of a thin, stable, fine and stable chromium rich oxide film, and then the ability to rust is obtained. Once for some reason, the film is constantly damaged. The oxygen atoms in the air or liquid will enter or the iron atoms in the metal will continuously separate out to form loose iron oxide. The metal surface will be continuously corroded, and the protective film of stainless steel flange will also be damaged.
Corrosion of several common stainless steel flange in daily life:
The surface area of stainless steel flange is covered with dust, including the attachment of other metal particles. In moist air, the condensation water between the attachment and the stainless steel flange connects the two to form a micro cell, and then causes electrochemical reaction, and the protective film is damaged, which is called electrochemical corrosion; the surface of stainless steel flange adheres to organic juice (such as melon and vegetable, noodle soup, phlegm, etc.) and forms organic acid under the condition of water and oxygen.
The surface of stainless steel flange will adhere to substances containing acid, alkali and salt (such as alkali water and lime water splashing on the wall decoration), and then cause partial corrosion; in the polluted air (such as the atmosphere containing a lot of sulfide, carbon oxide and nitrogen oxide), sulfuric acid, nitric acid and acetic acid will be formed when meeting with condensate water, which will cause chemical corrosion.
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