Anodizing, the electrochemical oxidation of metals or alloys. Aluminum and its alloys form a layer of oxide film on aluminum products (anode) under the action of applied current under corresponding electrolyte and specific process conditions. If anodizing is not specified, it usually refers to sulfuric acid anodizing.

In order to overcome the defects of aluminum alloy surface hardness and wear resistance, expand the scope of application, and extend the service life, surface treatment technology has become an indispensable part of the use of aluminum alloy, and anodizing technology is the most widely used and most successful .