Rust is a general term for a series of iron oxides, usually red oxides, formed by the reaction of iron and oxygen in the presence of water or air moisture.
Rusting is the common term for corrosion of iron and its alloys, such as steel.
Given sufficient time, oxygen, and water, any iron mass eventually converts entirely to rust and disintegrates.
Any film or coating on metal caused by oxidation.(dictionary.com) accessed 19/1/2010
The reddish-brown crust that often forms on iron and steel objects comes from changes that take place in the outer surface of the metal itself. This crust, called rust, is caused by the mixture of the metal with oxygen from water in the air.
(http://www.bigsiteofamazingfacts.com/what-causes-rust) accessed 19/1/2010
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