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Why can iron remain protected from rusting for some time even if the zinc coating in galvanisation is scratched?

Answer and explanation

Correct answer: Zinc is more reactive than iron and oxidises preferentially

Zinc is more reactive than iron. Therefore, when a zinc coating is scratched, zinc oxidises in preference to iron and provides sacrificial protection. As a result, the exposed iron can remain protected from rusting for some time. In contrast, a broken paint coating does not provide sacrificial protection, so exposed iron may rust on contact with air and moisture.

Related tags

ScienceClass 10Chemical ReactionsGalvanisationRustingSacrificial ProtectionMetals

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