Anodic oxidation : Electrochemical oxidation of metals or alloys. The process of forming an oxide film on aluminum products (anodes) due to the effect of external current under the corresponding electrolyte and specific process conditions. If not specified, anodizing usually refers to sulfuric acid anodizing.
In order to overcome the defects of aluminum alloy surface hardness, wear resistance and other aspects, expand the scope of application and extend the service life, surface treatment technology has become an indispensable part in the use of aluminum alloy, and anodizing technology is currently the most widely used and most successful of.
The so-called anodizing of aluminum is an electrolytic oxidation process. In this process, the surface of aluminum and aluminum alloy is usually converted into an oxide film, which has protective, decorative and some other functional characteristics. From this definition, the anodization of aluminum includes only part of the process of generating anodized film.