Q35 of 400 Page 192

What is meant by 'anodising'? Why is it done?

Anodising is the process of thickening of aluminium oxide layer on the surface of aluminium objects by electrolysis. It is done to prevent aluminium objects from further corrosion.

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34 Explain why, the surface of some metals acquires a dull appearance when exposed to air for a long time. 35 Why does aluminium not corrode right through? 36 Why is an iron grill painted frequently? 36 Explain why, though aluminium is more reactive than iron, yet there is less corrosion of aluminium when both are exposed to air.