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304 stainless steel pipe: principle of rust resistance and corrosion resistance

Views: 13     Author: Site Editor     Publish Time: 2020-11-23      Origin: Site

The rust of steel in the atmosphere is the corrosion phenomenon of iron ionization to form unprotected iron oxides (rust), while the rust of 304 stainless steel pipe is also a kind of corrosion phenomenon. The difference is in the atmosphere. The ionization of iron and chromium in stainless steel forms a protective chromium-rich oxide (passivation film). The difference between them is only the essence of the chemical reaction product.

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It is believed that the rust of steel in the atmosphere is serious corrosion, and the rust of stainless steel is because stainless steel does not corrode, which is visible to the naked eye with the reddish brown rust formed on the surface of steel, and a thin layer of passivation is formed on the surface of stainless steel. The colorless and transparent film is not visible to the naked eye. What people can see is the misunderstanding caused by the bright and beautiful metal surface under the passivation film.

It is conceivable that if the passivation film on the surface of the 304 stainless steel pipe is not colorless and opaque, what will be the result? The rust resistance of the 304 stainless steel pipe is determined by the chromium content in the steel (the steel contains enough chromium to ensure the surface The formation of chromium-rich oxide film, so the higher the chromium content, the better the corrosion resistance of stainless steel, which has nothing to do with whether the stainless steel pipe is magnetic or not. Without chromium, there is no stainless steel pipe.

A large number of studies and practices at home and abroad have shown that chromium is the only element that can passivate steel and make steel stainless, corrosion resistant and of industrial value. The so-called chromium-free stainless steel pipe does not exist. The only feature of stainless steel pipe is that it does not produce rust in the atmosphere and fresh water (that is, it has rust resistance). It should be distinguished from the steel that is corrosion-resistant but produces rust in the atmosphere, fresh water and acid, alkali, salt and other media.

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