Rust

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Rust, the most familiar example of corrosion.
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Rust, the most familiar example of corrosion.

Rust is a type of Corrosion. Rust is the slow breaking of metals, due to air or water touching them. Most all metals rust, but some metals are protected by a thin paint. Metals such as stainless steel, rust much slower then iron. When a piece of metal rusts, it changes to a different color, (ex. iron turns red) and the metal falls apart.