A process used to improve corrosion resistance of aluminum and its alloys. The material is cleaned, then immersed in a bath of acids. The metal is the positive pole, or anode, in the acid bath. A current is applied and oxidation occurs. After this process is complete and the item rinsed, a second step or sealing treatment is applied. It is during this step that a chromate is applied and various colours can be realized. This entire operation is also known as “two-step anodizing.”

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