MASSIMO BREGA / EURELIOS / SCIENCE PHOTO LIBRARY MASSIMO BREGA / EURELIOS / SCIENCE PHOTO LIBRARY
Rust and stainless steel. Rusty being chipped from an iron object (nut and bolt at left) with the tip of a stainless steel screwdriver (right) that is free of rust. Rust is hydrated iron oxide. It forms in a reaction between iron and atmospheric water vapour and oxygen. This corrodes and weakens the original iron structure. Stainless steel is an alloy that contains iron, but also contains over 10 percent chromium. This makes it resistant to ordinary corrosion.
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