Why does stainless steel pipe rust?

When the surface of the stainless steel tube brown rust spots (spots), people are surprised: that "stainless steel is not rust, rust is not stainless steel, may be a problem with steel". In fact, this is a lack of understanding of stainless steel is a one-sided wrong view. Stainless steel will rust under certain conditions.

Stainless STEEL HAS THE ABILITY to resist ATMOSPHERIC OXIDATION - that is, rust resistance, but also has the ability to resist corrosion in the medium containing acid, alkali, salt - corrosion resistance. However, the corrosion resistance of the steel varies with its chemical composition, additive state, service conditions and environmental media type. Such as 304 steel pipe, in a dry and clean atmosphere, has absolutely excellent corrosion resistance, but it moved to the seaside area, containing a large amount of salt in the sea fog, will soon rust; The 316 steel pipe performed well. Therefore, not any kind of stainless steel, corrosion resistance in any environment, not rust.

Stainless steel is formed on the surface of a layer of extremely thin and strong fine stable chrome-rich oxide film (protective film), to prevent oxygen atoms continue to infiltrate, continue to oxidize, and obtain the ability to resist corrosion. Once for some reason, the film is continuously destroyed, oxygen atoms in air or liquid will continue to penetrate or iron atoms in metal will continue to resolve out, forming loose iron oxide, and the metal surface will be constantly corroded. There are many forms of damage to this surface film, and the following are more common in daily life:

1, the surface of stainless steel deposit containing other metal elements of dust or metal particles, in the humid air, condensate between the attachment and stainless steel, the two into a micro cell, triggered the electrochemical reaction, protective film is destroyed, known as electrochemical corrosion.

2, stainless steel surface adhesion organic juice (such as melon vegetables, noodle soup, phlegm, etc.), in the case of water and oxygen, constitute organic acids, long time organic acid corrosion on the metal surface.

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