Anodizing
From GAWDAwiki
Anodizing is a method of artificially thickening the oxide film on an aluminum alloy by an electrolytic process. The component to be treated is made the anode in a tank of electrolyte, and on the passage of electric current, oxygen is produced which reacts with the metal surface to form a tightly adherent oxide coating. Dyes may be added to the electrolyte to produce color anodized surfaces. [1]
