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29/09/2021 10:32 pm
Topic starter
(a) Why is an iron grill painted frequently?
(b) Explain why, though aluminium is more reactive than iron, yet there is less corrosion of aluminium when both are exposed to air.
1 Answer
1
29/09/2021 10:32 pm
(a) An iron grill is painted frequently to prevent its rusting.
(b)There is less corrosion of aluminium than iron when both are exposed to air because aluminium forms a layer of aluminium oxide on its surface as soon as it comes in contact with moist air. This aluminium oxide is very tough and prevents it from corroding right through.