Hard coat or hard anodizing (Type III) is similar to standard anodizing, (Type II) in as much as it also creates a film of aluminum oxide on the part. It is produced at colder temperatures and provides a surface that is harder, smoother, and more wear and corrosion resistant than standard anodizing.Hardcoat finishes are typically darker in appearance than standard anodizing depending on the coating, thickness and alloy. A variety of colors are available on thinner coatings. Heavier coatings can be dyed black and some darker shades of color. Arnold’s Metal Finishing Type III Anodizing Plating Capabilities:
|MIL-A-8625F Type III||MIL-STD-186D (207)||MIL-STD-171D(7.5.1 & 7.5.2)|
|AMS B117||AMS 2468 & 2469||ASTM B580-79 (Type A)|
Typical Applications of Hard Anodizing are: Machinery, excellent abrasion resistance for high-speed machine arts; Electronics, provides uniform emissive and a high dielectric; Marine, long-lasting corrosion resistance in salt-water; Oil and Petrochemical, excellent corrosion and wear resistance; Aviation and Space, durability and longevity; Ordnance, corrosion protection, and abrasion and wear resistance; Cookware, corrosion protection and non-stick properties.