Anodizing is an electrochemical process of producing protective and decorative coating of aluminium oxide on the surface of aluminium and its alloys. A film of aluminium oxide is formed on the surface of aluminium through the use of a direct current electric supply Copy the link given below and paste it in new browser window to get more information on Anodizing:- http://www.transtutors.com/homework-help/mechanical-engineering/anodizing.aspx