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The gradual eating up of metals by action of air, moisture or a chemical reaction (such as an acid) on their surface is called corrosion. The most commonly seen example of corrosion of metals is rusting of iron i.e the formation of a brown flaky substance on iron objects on exposure to moist air.
4Fe+3O2+2H2O -> 2Fe2O3.H2O
The two damages caused by corrosion are the waste of valuable resources and contamination of a product. It can be prevented by methods like Alloying, Galvanizing, and Electroplating.
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