You must have heard that the oxide layer on metals is generally known to be the corroded layer of the metal surface. It is very true that different metals form different colors upon reacting with air or moisture, thereby forming a distinctive oxide layer on the outer surface of the metal. However, not all oxide layers are considered to be undesirable. For example, in aluminum, an oxide layer on the outer surface will impart tremendous properties to the metal and make it suitable for several industrial applications. The process of forming an oxide layer over the outer surface of aluminum is known as Aluminum Anodizing technique.
The aluminum anodizing is not an electroplating, but an electrochemical process. It improves the physical and chemical properties of the aluminum metal to a greater extent. It could be so useful that the metal surface will not corrode, even if it were to be submerged in water for years together. Additionally, the anodizing layer will make it easy for the operator to coat the aluminum surface with the color of their interest. Moreover, the aluminum anodizing process is helpful in creating an electrical insulation, which has dielectric properties as well. Therefore, the melting point of the metal increases enormously.