What materials can be anodized, and what is the process of anodization?

Aluminum alloy, magnesium alloy, titanium alloy can do anodizing treatment, anodizing is in sulfuric acid or chromic acid and other acidic solution, the workpiece as an anode, plus the external voltage, in the workpiece surface to grow a layer of oxide film, film layer is very hard, wear resistance function is very good.