Stainless steel is rust-resistant. Its rust resistance and corrosion resistance are due to a passive film on its surface, which prevents the metal from being corroded by external media, thus providing its rust resistance. When stainless steel is exposed to moisture or chloride ions, or during mechanical wear or welding, the passive film is destroyed, causing the stainless steel to rust. Therefore, the rust resistance and corrosion resistance of stainless steel are relative. Different environments require stainless steel with different chromium contents.

Although stainless steel is a highly corrosion-resistant decorative metal material, its surface can still rust under certain harsh conditions.

The corrosion resistance of stainless steel is closely related to its chromium content. Its main components are iron, chromium, and nickel, with a chromium content of at least 10.5%. At room temperature, oxygen in the air reacts with chromium to form a dense protective chromium oxide film. This film blocks further attack from external oxygen, water, and acid ions, protecting the stainless steel substrate from corrosion. However, if this film is damaged or other factors prevent it from forming or persisting for a long time, the stainless steel loses its rust resistance and becomes more susceptible to rust.

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