Corrosion
When the metals are exposed to the atmospheric circumstances, they react with the air or water in the environment to form undesirable compounds (usually oxides). This process is termed as corrosion. Almost all metals except the least active metals like platinum, gold, and palladium are attacked by environment that is undergo corrosion. For instance, silver tarnishes, copper develop the green coating, lead or the stainless steel loses their lusture because of corrosion. Corrosion causes enormous damage to bridges, ships building, and many such articles made of iron.
Therefore we can say that corrosion is a process of the deterioration of a metal as a result of its reaction with air or water (environment) surrounding it.
In case of iron, corrosion is called rusting. WE can say that chemically, rust is hydrated form of the ferric oxide, Fe2O3.xH0O. Rusting of iron is generally caused by the carbon dioxide moisture, and oxygen present in the air. It has been seen that rusting takes place only when iron is in contact with moist air. Iron does not rust in the presence of dry air and in vacuum.
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