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What is the anodizing process?

April 26, 2017Anodizing process

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What is the anodizing process?

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Anodizing is an electrochemical process for forming an artificial oxide coating layer on aluminum. The coating provides increased corrosion protection and wear resistance, and can also produce a rainbow of colors to improve the aesthetic appearance of the product.

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The process of anodizing aluminum involves several steps. First the metal is immersed in a bath of caustic soda solution for several minutes to both clean the surface and etch it slightly. Then it is thoroughly rinsed and immersed in a solution of nitric acid for several minutes. It is rinsed again and then is attached to a copper rod and immersed in a lead-lined tank containing a sulfuric acid solution. A low current is run through this solution for up to one hour. It is this process of electrolysis that results in the coating of the aluminum with the anodic film. At the end of the run the aluminum is again thoroughly rinsed, dipped in an acid-neutralizing solution and rinsed again.