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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.
Corrosion and more specifically, rust, is caused by one of three general factors: 1  Process Related â whether it is the cleaning process, the metal fabrication process such as cold working, heat treating or machining or the handling process, this aspect of producing a metal part is a primary contributor of corrosion.ust from Iron (III) oxides with high oxygen and low moisture results in brown rust. 1  Brown rust is a drier rust than those mentioned above. 2  It is most likely atmospheric â having formed as a result of water and oxygen in the atmosphere and presenting as a reddish-brown crust on the metalâs surface.