In anodising, a clean aluminum article is made the anode and is electrolysed with dilute sulfuric acid. Oxygen gas is evolved at the anode and reacts with aluminum to form a thicker protective oxide layer.
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In anodising, a clean aluminum article is made the anode and is electrolysed with dilute sulfuric acid. Oxygen gas is evolved at the anode and reacts with aluminum to form a thicker protective oxide layer.
In the electrolytic process of anodizing aluminum, the metal is immersed as the anode in an electrolyte bath containing an acid, typically sulfuric acid. A direct current (DC) is applied, causing oxygen ions to react with the aluminum surface. This triggers the formation of a thick and porous layer of aluminum oxide on the metal’s surface. The anodizing process includes two main stages: the formation of the oxide layer and subsequent sealing. The porous structure allows for dye absorption in colored anodized aluminum. This electrochemical process enhances corrosion resistance, hardness, and provides a platform for various aesthetic finishes on aluminum products.