Sulfuric Acid Anodizing
Sulfuric acid is the most widely used solution to produce an anodized coating. It is less expensive, more environmentally friendly and easier to dye than chromic acid anodize. The Type II coating as designated by the Mil-A-8625 standard has a moderate thickness 0.00007” to 0.001”. The sulfuric acid anodizing coating is also covered in the AMS 2471 and ASTM B580 specifications. The natural color of sulfuric acid anodize will vary depending on the alloy. It can be dyed to almost any color or shade. Sulfuric acid anodize that is not dyed is commonly referred to as clear anodize. After anodize the solution may be sealed in hot water, nickel acetate, sodium dichromate or ROHS compliant solutions.