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What Causes Rust?
Rust is the name of iron oxides that form when iron corrodes. Rust forms when the oxygen dissolved in water reacts with iron. There are always two different reactions in a corrosion process:
1) oxidation of Iron
2Fe ---> 2Fe2+ + 4e-
2) reduction of Oxygen
O2 + 4 e-
The overall reaction is the formation of Iron oxides (Rust)
2Fe2+ + 4OH- ----> 2Fe(OH)2
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