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Anodic oxidation, electrochemical oxidation of metals or alloys. Aluminum and its alloys in the corresponding electrolyte and the specific process conditions, due to the application of current, the aluminum products (anode) to form a layer of oxide film process. Anodic oxidation, unless otherwise specified, usually refers to sulfuric acid anodization.
In order to overcome the aluminum alloy surface hardness, wear resistance and other defects, to expand the scope of application, extend the service life, surface treatment technology has become an indispensable part of the use of aluminum, and anodization is the most widely used and the most successful of.
Generally, the anodes are made of aluminum or aluminum alloy as the anode, the cathode is the lead plate, and the aluminum and the lead plate are placed in an aqueous solution. There are sulfuric acid, oxalic acid, chromic acid and the like, The surface of the formation of an oxide film. Among these acids, the most widespread one is anodic oxidation with sulfuric acid