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Why does not iron rust even if zinc coat...

Why does not iron rust even if zinc coating is broken in a galvanised iron pipe ?

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Zinc being more reactive than iron will sacrifice itself for the sake of iron. As a result, zinc will participate in the corrosion while iron will remain intact. For more details, consult Section 23.
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Iron does not rust even if zinc coating on its surface is broken but the same is not true when coating is of tin.

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