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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 occurs when metal faces prolonged contact with water, and combines with oxygen in a process called oxidation. The process corrodes the metal, dissolving it into the chalky reddish-brown substance known as rust.The best way to deal with rust is to prevent it by keeping metal surfaces dry.ust occurs when metal faces prolonged contact with water, and combines with oxygen in a process called oxidation. The process corrodes the metal, dissolving it into the chalky reddish-brown substance known as rust.