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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.
Rusting is the general term used to describe the corrosion of iron and its alloys, such as steel. The process of rust involves the way various materials react with oxygen, which results in the chemical compound of rust. When iron combines with oxygen, iron oxide forms.usting is the general term used to describe the corrosion of iron and its alloys, such as steel. The process of rust involves the way various materials react with oxygen, which results in the chemical compound of rust. When iron combines with oxygen, iron oxide forms.