Question

coating of iron or steel surface with the layer of zinc to prevent rusting

Answer 1

Coating of iron or steel surface with the layer of zinc to prevent rusting is known as galvanisation. Galvanising is a method of rust prevention. The iron or steel object is coated in a thin layer of zinc. This stops oxygen and water reaching the metal underneath - but the zinc also acts as a sacrificial metal. Zinc is more reactive than iron, so it oxidises in preference to the iron object.
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