Aluminum alloys are anodized to increase corrosion resistance and to allow dyeing (coloring). Anodizing is a method of increasing the corrosion resistance of a metal part by forming a layer of oxide on its surface. The process of creating this protective oxide coating is achieved electrolytically. The aluminum is submerged in an electrolytic solution bath along with a cathode. When a current is passed through the acid solution an oxide layer is formed. Dyeing is the most common anodizing processes, electrolytic acid solution produces a porous surface which can accept dyes easily. The number of dye colors is almost endless; however, the colors produced tend to vary according to the base alloy. Dyed anodizing is usually sealed to reduce or eliminate dye bleed out.
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