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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 formation of iron oxide due to oxidation of iron, or any alloy containing iron. Other metals, such as aluminum and nickel will corrode and turn greenish.Since mercury is not a solid at room temperature, corrosion as defined doesnt really happen either.nd deionized water can pull copper metal from the piping and cause pitting or damage. The term rusting is reserved for the corrosion of iron. Copper does not rust. Rust is a mixture of hydrated iron oxides so, by definition, if will only form on iron and iron-rich materials (such as some types of steel).