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Anodizing is an electro-chemical process that forms a durable, porous oxide film on the surface of the aluminum extrusions, adding to the protection provided by its natural oxide layer. Anodizing is a process in which the aluminum extruded profile is immersed in a tank containing an acid-based electrolyte; a current is passed through the solution, carefully controlling the temperature of the electrolyte. The aluminum extruded profile serves as the anode, so the electrolyte releases oxygen ions at the surface of the profile. The oxygen immediately combines with the surface aluminum to form a hard aluminum oxide film.
Hardcoating, or hard anodizing, is a modification of sulfuric anodizing, performed at high current densities and low temperatures. Sometimes additives are mixed into the electrolyte to produce a denser, more abrasion-resistant oxide film, imparting high wear resistance to the product.
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