Hard Anodizing/Type III Anodizing :

Hard coat Anodizing, often called “Type III anodizing” as denoted by MIL spec 8625, is an electro-chemical process that creates a controlled oxide film on the surface of aluminum.Hardcoat Anodizing utilizes sulfuric acid, sub zero bath temperatures, and constant current rectification to achieve a very hard coating. Hard coat Anodizing is generally used for applications that need a strong corrosive, abrasive, and wear resistant coating than normal anodizing. The appearance of the coating ranges from light to dark gray, depending on the alloy makeup of the aluminum substrate, and it can also be dyed black.

Properties of Hard coat Anodizing:

• Compatible with adhesives and paints.
• Excellent abrasion resistant.
• Resistant to marine and atmospheric corrosion.
• High surface hardness.
• Electrical resistant.
• Withstand high operative temperature.