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Under what circumstances will stainless steel plate be corroded

by:Topson     2022-09-14

Stainless steel plates are generally stainless steel plates and acid-resistant steel plates. At the beginning of this century, the development of stainless steel plate laid an important material and technical foundation for the development of modern industry and the progress of science and technology. Stainless steel has many different properties, and it has gradually formed several categories in the process of development.

Under what circumstances will stainless steel be corroded? How much do you know about this problem? Topson will tell you about this problem below, hoping to help everyone.

The application environment of stainless steel plate is very complex, and the simple chromium oxide passivation film cannot meet the requirements of high corrosion resistance. Therefore, it is necessary to add molybdenum (Mo), copper (Cu), nitrogen (N) and other elements to the steel according to different use conditions to improve the composition of the passivation film and further improve the corrosion resistance of the stainless steel plate. The addition of Mo promotes the passivation of the substrate and prevents the corrosion of the substrate due to the close distance between the corrosion product MoO2- and the substrate. The addition of Cu makes the passive film on the surface of the stainless steel plate contain CuCl, which improves the corrosion resistance of the stainless steel plate because it does not interact with the corrosive medium. The addition of N increases the corrosion resistance of the stainless steel plate, which is due to the enrichment of Cr2N in the passivation film and the increase of the Cr concentration in the passivation film.


The corrosion resistance of stainless steel sheets is conditional. One brand of stainless steel sheets is corrosion resistant in one medium, but may be damaged in another medium. At the same time, the corrosion resistance of stainless steel is also relative. So far, there is no stainless steel that is absolutely non-corrosive in all environments.

Stainless steel plate not only has the ability to resist atmospheric oxidation—that is, rust prevention, but also has the ability to corrode in the medium containing acid, alkali and salt—that is, corrosion resistance. However, its corrosion resistance varies with its chemical composition, state of protection, conditions of use and type of environmental media. For example, 304 steel pipe has excellent corrosion resistance in a dry and clean atmosphere, but it will be moved to coastal areas, which contains a lot of salt in sea fog and will rust quickly; 316 steel pipe has good performance. Therefore, it is not any kind of stainless steel plate, which can resist corrosion and rust in any environment.



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