Factors which Affect Corrosion
The main factors which affect corrosion are
1.More the reactivity of metal, the more will be the possibility of the metal getting corroded.
2.The impurities help in setting up voltaic cells, which increase the speed of corrosion
3. Presence of electrolytes in water also increases the rate of corrosion
4. Presence of 
in natural water increase rusting of iron.
5.When the iron surface is coated with layers of metals more active than iron, then the rate of corrosion is retarded.
6. A rise in temperature (with in a reasonable limit) increases the rate of corrosion.
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