The iron undergoes a rapid oxidation if tin coating is scratched . thus ,the coating of tin it self is varnished to prevent iron from coming in contact with oxygen .
There are reaction takes place at cathode in case of tin and iron , these half-cell reactions are ,
Fe^2+(aq) + 2e^- ==> Fe(s) Â , Â E^0 reduction = -0.44V
Sn^2+ (aq) + 2e^- ==> Sn(s) Â Â , E^0 reduction = -0.14V
The value of reduction potential of iron is less than tin . thus iron has more tendency to get oxidized while tin undergoes reduction .
Hence iron undergoes rapid oxidation if tin coating is scratched .
It is a electrochemical process in which the surface of the metal is slowly eaten away when it comes in contact with the atmosphere.
Corrosion may also be called weeping of metals .
If loss of electron takes place then it is called as oxidation . it occurs at anode.
If gain of electron takes place then it is called as reduction . it occurs at cathode .
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