Question

How is anodizing of aluminium carried out?

Answer 1

Aluminium reacts with air and forms a thin layer of aluminium oxide on it. This layer of oxide prevents further reactions and protects the metal from corrosion. If this oxide layer formation is more uniform, the metal below the layer would be well-protected. This can be formed with the help of a process called anodising. In this process, electric current is passed through sulphuric acid, utilising aluminium as anode. Oxygen is liberated at anode and it reacts with aluminium and forms a uniform oxide layer of aluminium, which protects the metal from corrosion. This is how anodising of aluminium is done.