Why will stainless steel pipe rust and corrosion?

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, etc.), in the case of water and oxygen, constitute organic acid, long time organic acid corrosion on the metal surface.

3, stainless steel surface adhesion contains acid, alkali, salt substances (such as decoration wall alkali, lime water splash), causing local corrosion.

4, in the polluted air (such as containing a large number of sulfide, carbon oxide, nitrogen oxide atmosphere

), in the case of condensation water, the formation of sulfuric acid, nitric acid, acetic acid liquid point, causing chemical corrosion.

The above conditions can cause the destruction of the stainless steel surface protective film and lead to corrosion.

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