Aluminium develops a thin
oxide layer when exposed to air. This aluminium oxide coat makes it resistant
to further corrosion. The resistance can be improved further by making the
oxide layer thicker. This process is called anodizing.
During anodizing, a clean aluminium article is made the
anode and is electrolyzed with dilute sulphuric acid. The oxygen gas evolved at
the anode reacts with aluminium to make a thicker protective oxide layer. This
oxide layer can be dyed easily to give aluminium articles an attractive finish.
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