Why is galvanised article protected aginst rusting even.if the zinc coating is broken.com

Dear Student,

reduction potential of Zn is -0.76 V while that of Fe is - 0.44V.

So Zn is more reactive than Iron towards oxidation.

Hence when both are present, zinc would be oxidized in preference to iron.
In this way zinc will continue to protect iron till whole of it is converted to Zn2+.

In other way, Zinc lies above iron in reactivity series making it more reactive. So, it will preferably react with oxygen. 


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