Can stainless steel square pipe really rust?
Most people think that stainless steel will never rust, and rust is not stainless steel. In fact, some stainless steel materials with low nickel content will rust under certain conditions. Stainless steel square pipe has the ability to resist atmospheric oxidation, but also has the ability to resist corrosion in the medium containing acid, alkali and salt. However, the size of its corrosion resistance is changed with the chemical composition of the steel itself, the mixing state, the use conditions and the type of environmental media. Therefore, not any kind of stainless steel, in any environment can resist corrosion without rust.
Stainless steel is formed on its surface by a layer of extremely thin and solid fine stable chromium-rich oxide film to prevent oxygen atoms from infiltrating oxidation, and obtain the ability to resist corrosion. If the film is damaged, the stainless steel square tube will lose its rust resistance. There are four types of destruction that are common in everyday life.
1. The surface of the stainless steel square pipe adheres to organic juice, which constitutes organic acid in the case of water oxygen, and the organic acid corrodes the metal surface for a long time.
2. In polluted air, in case of condensation water, sulfuric acid, nitric acid, acetic acid liquid point is formed, causing chemical corrosion.
3. The surface of the stainless steel square tube contains dust or alien metal particles containing other metal elements. In the humid air, the condensate between the attachment and stainless steel connects the two into a microbattery, which causes an electrochemical reaction and damages the protective film, which is called electrochemical corrosion.
4. Stainless steel square pipe surface adhesion contains acid, alkali, salt substances, causing local corrosion.
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