Anodizing is a process of forming a thick oxide layer of which of the following metals through an electrolytic process?
aluminium
Anodizing is an electrolytic surface treatment in which the metal to be treated is made the anode in an electrolyte such as dilute sulphuric acid. Oxygen released at the anode reacts with the metal to build up a thick, hard, protective oxide layer on its surface. This process is done industrially on aluminium because the natural oxide layer of aluminium is thin, and anodizing thickens it, making the surface more corrosion-resistant and also allowing it to be dyed in different colours.
Iron is not anodized in this way — it is usually protected by galvanising, painting or electroplating with zinc. Copper and zinc also do not undergo the classic anodizing process for this purpose; the term is essentially reserved for aluminium (and a few reactive metals like titanium).
Hence, the answer is aluminium.
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