Why does precision stainless steel welded pipe rust?

In fact, it is not that stainless steel will not rust, but the corrosion resistance is relatively high, properly used, well maintained if the service life is very long.

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 stainless steel surface deposit containing other metal elements of dust or metal particles, in the humid air, condensate between the attachment and stainless steel, the two connected 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 acid, long time organic acid corrosion on the metal surface.

3. The surface adhesion of stainless steel contains acid, alkali, salt substances (such as alkali water and lime water splashing in the decoration wall), and local corrosion of the machine.

4. In the polluted air (such as the atmosphere containing a large number of sulfide, carbon oxide, oxiditis), the condensation of 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.

Therefore, in order to ensure that the metal surface is bright and not corroded, we must pay attention to the following aspects:

1 must often clean and scrub the surface of decorative stainless steel, remove the attachment, eliminate the external factors caused by modification.

2. Stainless steel 316 material should be used in coastal areas,316 material can resist seawater corrosion.

3. Some stainless steel pipe chemical composition on the market can not meet the national standards, not up to 304 material requirements. Therefore, it will also cause rust, which requires users to carefully choose the products of reputable manufacturers.

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