Due to the extensive application of stainless steel columns, especially in home environments, this is because of their rust-free property and easy cleaning. However, in daily life, it is often seen that some stainless steel columns are rusty and mottled. Why is that?

　　Generally speaking, when we say that stainless steel does not rust, it is because stainless steel has the ability to resist atmospheric oxidation and also has the ability to resist corrosion in media containing acids, alkalis and salts. Therefore, not all types of stainless steel can resist corrosion and not rust in any environment.

　　Stainless steel acquires its rust resistance by relying on a very thin, strong and dense stable chromium-rich oxide film formed on its surface, which prevents oxygen atoms from further penetrating and oxidizing. Once for some reason, this film is constantly damaged, forming loose iron oxide. There are many forms in which this outer film is damaged. The following are several common ones in daily life:

　　1When dust containing other metal elements or particles of dissimilar metals accumulate on the surface of stainless steel, in a humid environment, the condensate water between the adherent substances and the stainless steel triggers an electrochemical reaction, damaging the protective film. This is known as electrochemical corrosion.

　　2The surface of stainless steel adheres to substances containing acids, alkalis and salts, causing local corrosion.

　　3Organic juice adheres to the surface of stainless steel. In the presence of water and oxygen, over a long period of time, organic acids will corrode the metal surface.

4In polluted air, upon encountering condensation water, liquid spots of sulfuric acid, nitric acid and acetic acid are formed, causing chemical corrosion.

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