http://www.britannica.com/EBchecked/topic/369090/materials-testing/80759/Corrosion
This article states that metals corrode because of a chemical reaction that changes some of the metal to a more stable material. This is the oxide for for the metals (iron's oxide being rust.) In general, the layer of oxide that forms on the metal is supposed to protect the metal from further corrosion, but metals that do not form a tight layer above the metal when corroded, continue corroding.
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