How corrosion is useful for us
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This is actually beneficial in the case of aluminum and stainless steel, because the oxide forms a strongly adherent coating which effectively prevents further degradation. Hence, these metals are used for structural purposes. The rusting of iron is a familiar form of corrosion which is catalyzed by moisture.
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How corrosion is useful for us?
[1] Surface corrosion forms an oxide layer which further protects the inner metal form corrosion.
[2] Some metals like zinc are used as sacrificial anodes to prevent corrosion to other metal.
[3] The principle on which primary batteries work.
In which one metal corrodes preferentially to another when both metals are in electrical contact, in the presence of an electrolyte.
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