Most people think that stainless steel will not rust, but it is not stainless steel that rusts. In fact, some stainless steel materials with low nickel content will also rust under certain conditions. Stainless steel square tube has the ability to resist atmospheric oxidation and corrosion in acid-containing, alkali and salt media. However, the corrosion resistance of steel varies depending on its chemical composition, additive status, usage conditions and environmental media types. Therefore, not all types of stainless steel are resistant to corrosion and rust in all environments.
Stainless steel forms a thin, strong and stable chromium-rich oxide film on its surface to prevent oxygen atoms from penetrating the oxide layer and gain corrosion resistance. If the membrane is damaged, the stainless steel square tube will lose its rust resistance.
There are four common ways of sabotage in everyday life:
(1) In the presence of water and oxygen, organic acids are formed on the surface of stainless steel square pipes, which will corrode the metal surface for a long time.
(2) When encountering condensed water in polluted air, liquid points such as sulfuric acid, nitric acid, and acetic acid will form, causing chemical corrosion.
(3) There is dust containing other metal elements or dissimilar metal particles attached to the surface of the stainless steel rectangular tube. In humid air, the condensed water between the attached parts and the stainless steel connects them to form micro-batteries, causing electrochemical reactions and destroying the protective film, which is called electrochemical corrosion.
(4) There are acids, alkalis, and salts on the surface of stainless steel square and rectangular pipes, causing local corrosion.

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