Discuss the methods by which rusting of iron can be prevented.
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Explanation:
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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(a) The rusting of iron can be prevented by painting, oiling, greasing or varnishing its surface. (b) Galvanisation is another method of protecting iron from rusting by coating it with a thin layer of zinc.
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