Anodizing is an electrochemical process by which a protective oxide layer is formed on the treated surface and protects it from corrosion and atmospheric agents.
The process consists of a superficial transformation of the aluminum in aluminum oxide, through the immersion of the parts to be treated in an acid solution where occurs a continuous current flow, with the objects acting as an anode (positive pole).
The atomic oxygen that develops at the passage of the current combines with the aluminum atoms forming an oxide whose growth is controlled, with an improvement in the properties with respect to the naturally formed oxide. The oxide layer formed is variable from 5 microns to 30 microns. There are two types of anodic oxidation: thin or hard to thick.