Anodized aluminium is ...

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(D) Anodizing is an electrochemical process that converts the metal surface into a decorative,durable,corrosion-resistant,anodic oxide finish.In the c

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An electrolytically deposited layer of aluminium oxide on $Al$

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(D) Anodizing is an electrochemical process that converts the metal surface into a decorative,durable,corrosion-resistant,anodic oxide finish.In the case of aluminium,the metal is made the anode in an electrolytic cell containing an electrolyte (like dilute sulphuric acid).When current is passed,oxygen is evolved at the anode,which reacts with the aluminium surface to form a protective layer of aluminium oxide $(Al_2O_3)$.Therefore,anodized aluminium refers to aluminium with an electrolytically deposited layer of aluminium oxide on its surface.

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