Iron does not rust even if zinc coating on its surface is broken but the same is not true when coating is of tin. Why ?
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The zinc is more reactive than iron. This means that if a crack appears on the surface of iron coated with zinc even the zinc will take part in the redox reaction and not iron.
In other words, zinc will be corroded in preference to iron. But same is not the case with tin because It is less reactive than iron. If a crack appears on the surface of iron coated with tin, then iron will take part in the redox reaction and not tin. Therefore, iron will be corroded under these circumstances.
In other words, zinc will be corroded in preference to iron. But same is not the case with tin because It is less reactive than iron. If a crack appears on the surface of iron coated with tin, then iron will take part in the redox reaction and not tin. Therefore, iron will be corroded under these circumstances.
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YEA, because iron is less reactive than zinc but more reactive than tin. So, Zinc protects it but tin couldn't.
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