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Anodizing is an electrochemical process developed in the 1920's and used mainly on alloys of aluminum.
The anodizing process uses electrical energy which is passed through the part while it is submerged into a chemical solution in order to produce the surface finish.
Type II - This is relatively thin oxide, used mainly for appearance benefits, including dyes to produce colored finishes. The process is generally performed in a diluted sulfuric acid solution at a controlled temperature and results in a surface oxide thickness of less than 1 mil (0.001").
Type III - This is a thicker finish produced at lower temperatures, and is used mostly in parts that are subject to wear. This type of finish is also called hardcoat or hard anodizing. With the thickness results of greater than 1 mil.
The anodized finish can by dyed to achieve a variety of colors, sealed for further surface protection, and applied in different oxide thickness to reach varying wear results.
Anodizing is a well-known surface finish as it is often used in aluminum consumer products such as: quality cookware, flashlights, sporting and recreational products. Also, anodized components are in various industrial applications like aircrafts and automobiles relying on anodizing for abrasion resistance, extreme hardness, corrosion protection as well as many additional benefits.