02-02-2018, 01:54 AM
Anodizing aluminum is considered an electrochemical process. It involves taking an aluminum alloy and submerging it in a tank filled with an electrolytic solution. This solution contains acid; the type of acid depends on the application. Once submerged, an electrical current is passed through the aluminum. The aluminum being anodized serves as the anode. A cathode is placed into the tank as well; usually aluminum or lead. The electrical current causes the aluminum to oxidize. The anodizing process leaves a layer of aluminum oxide thicker than what can be achieved through natural oxidation.