It is aluminum that has been pre-treated by anodizing. The end product is an artificial oxide patina on the metal alloy. The method of obtaining anodized aluminum is based on 3 phases: purification and degreasing of aluminum, anodizing and fixing. This ensures an increase in the resistance of aluminum. After the process mechanical satining is carried out to eliminate natural oxide. Then the surface of the metal to be anodized is degreased to remove impurities. The next phase involves immersing a piece of aluminum in a tank with water, in which an electric current circulates. So that during electrolysis, oxygen combines with aluminum. In this way, an insoluble and compact barrier is formed, which adheres perfectly to the metal surface.