Anodic oxidation, electrochemical oxidation of metals or alloys. Aluminum and its alloys form an oxide film on aluminium products (anodes) under the action of applied current in the corresponding electrolyte and specific process conditions. Anodic oxidation, if not specified, usually refers to sulfuric acid anodic oxidation.
In order to overcome the defects of surface hardness and wear resistance of aluminium alloy, expand its application scope and prolong its service life, surface treatment technology has become an indispensable part in the use of aluminium alloy, and anodic oxidation technology is the most widely used and successful technology at present.
The so-called anodic oxidation of aluminium is an electrolytic oxidation process, in which the surface of aluminium and aluminium alloys is usually transformed into an oxide film, which has protective, decorative and some other functional properties. The anodic oxidation of aluminium based on this definition only includes the process of forming anodic oxide film.