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Rust is an iron oxide, usually red oxide formed by the redox reaction of iron and oxygen in the presence of water or air moisture.Several forms of rust are distinguishable both visually and by spectroscopy, and form under different circumstances.ther forms of rust exist, like the result of reactions between iron and chloride in an environment deprived of oxygen â rebar used in underwater concrete pillars is an example â which generates green rust.
Rust is the result of the oxidation of iron. The most common cause is prolonged exposure to water. Any metal that contains iron, including steel, will bond with the oxygen atoms found in water to form a layer of iron oxide, or rust. Rust will increase and speed up the corrosion process, so upkeep is important.here are two ways you can use a potato to remove rust: 1  Simply stab the knife into potato and wait a day or overnight. 2  Slice a potato in half, coat the inside with a generous portion of baking soda, and go to town on the rusted surface with the baking soda-coated potato.