Type III, Hardcoat Anodizing (HCA)
The primary objective of this process is to obtain a hard coating, resistant to abrasion. It is obtained using an electrolyte of sulfuric acid at low temperature with high voltage and curent density.
- Highest wear resistance
- Very good electrical insulation, 800V/mil
- Thicker and denser than sulfuric anodizing, films range from .002"-.004" thick. (50% penetration, 50% over substrate)
- Dimensions will change and have to be considered into the design.
- Compatible with the alloys from 5000 to 7000, please call for special applications.
- Hardness of the anodic layer to 60-70 Rc
- Natural color from charcoal to dark bronze depending on the alloy
May be colored black only
- Recommended for aluminum components subject to extreme wear or corrosive environments.
- Can be used to reconstruct a surface worn or miss-machined part to size.
- More expensive than other types.
- Improved wear resistance
- The coating is harder than tool steel
- Can be dyed black only
- Can be buffed, polished, or honed.
- Can be used to rebuild a worn or miss-machined surface of a part to the desired dimension
- Sliding parts, rails, bushing...
- Hinge mechanisms
- Swivel joint
- Insulation plates