why a clean aluminium article is electrolysed with dilute sulphuric acid

Asked by  | 19th Sep, 2013, 10:04: PM

Expert Answer:

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.

Answered by Vaibhav Chavan | 20th Sep, 2013, 09:57: AM

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