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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.
The causes of rusting. 1  Tube 1 â water and air. 2  Tube 2 â water but no air (it is removed during boiling and the oil prevents any extra from dissolving in the water and reaching the nail) 3  Tube 3 â water, air and salt.  Tube 4 â air, no water (the calcium chloride removes the water from the air and the bung prevents any extra from entering.)