Anodizing is a multi-step finishing process. The first stages include deep cleaning, rinsing, and chemical etching. Finally, a cathode is connected to a negative current source, and an aluminum part is connected to a positive current source, and both are placed in a conductive medium. When the electrical current is activated, the oxygen in the solution reacts with the aluminum part, causing aluminum oxide to be formed on the surface. This is basically single/one-step anodizing. Two-step anodizing adds color. Deposition of various metals into the anodized finish gives color to the finish, from the bronze range to black. Specialty finishers can even provide red, blue, green, or white anodized finishes.
There are many benefits to an anodized finish. Not only does it offer greatly enhanced protection against corrosion, it also provides an increased resistance to normal wear and tear. Cleaning and maintenance is much easier with an anodized finish. Anodized surfaces are an excellent base for secondary coatings.
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