Question
Thu September 19, 2013 By:
 

why a clean aluminium article is electrolysed with dilute sulphuric acid

Expert Reply
Vaibhav Chavan
Fri September 20, 2013
Anodising is a process of forming a thick oxide layer of aluminium.
During anodising, a clean aluminium article is made the anode and is electrolysed with dilute sulphuric acid.
The oxygen gas evolved at the anode reacts with aluminium to make a thicker protective oxide layer. This aluminium oxide coat makes it resistant to further corrosion.
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