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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 process of metal oxidation. It is a chemical burning undergone by iron. Rust can happen when metals are in contact with water, air, oxygen, or acids. The main catalyst of metal rust is water, because its molecule can penetrate pits in any exposed iron. When metals are exposed to the corrosion-causing agents for quite long time, some of the parts will turn into orange-colored powder, known as rust. This substance has long been blamed for some health disturbances.