Why and how are iron objects prevented from corrosion
Answers
Some steps to prevent iron objects from corrosion :-
1) PAINTING :-surface of iron can be prevented by coating with paint to keep air and water away from the metal surface.
2) COATING WITH OIL OR GREASE :-bicycle chains, door hinges and car engines which cannot be painted are coated by a layer of oil or grease.
3)COATING WITH ZINC, ALUMINIUM AND MAGNESIUM METALS:- an iron layer coated with a thin layer of zinc is called galvanised iron.
●Zinc being non reactive prevents the iron surface from rusting.
●aluminium when applied on the iron surface forms a very resistant aluminium layer.
●Magnesium being more reactive than iron corroda fast and prevents the iron pillars submerged in the seawater from rusting.
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