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Anodising is a process of forming a thick oxide layer of aluminium. 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. 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 oxide layer can
be dyed easily to give aluminium articles an attractive finish.
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