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why a clean aluminium article is electrolysed with dilute sulphuric acid

Asked by 19th September 2013, 10:04 PM
Answered by 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 Expert 20th September 2013, 9:57 AM
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