Type II (Sulfuric or Color) Anodizing

The most common type of anodizing is sulfuric acid anodizing, also called decorative or color anodizing since it produces a porous surface which accepts dyes easily. The process essentially speeds up the natural oxidation of aluminum by placing an object into a bath of sulfuric acid and running an electric current through the solution. Dyed anodizing is usually sealed to reduce or eliminate dye bleed out.

Sulfuric anodizing is used widely used across all industries for general and commercial aluminum anodizing. Type II anodizing is most commonly based on the military specification MIL-A-8625. In addition to military and defense applications, this designation is also standard for commercial use around the world for aerospace, automotive and medical industry segments.

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