Type III, Hardcoat Anodizing (HCA)
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.
This anodizing offers the highest wear resistance.
It provides good electrical insulation (800V/mil) and is thicker and denser than sulfuric anodizing. The films range from .002″-.004″ thick. (50% penetration, 50% over substrate). The dimensions of this process will change and have to be considered into the design. It is compatible with the alloys from 5000 to 7000 (please call for special applications). The hardness of the anodic layer ranges from 60 to 70 Rc and it’s natural color varies from charcoal to dark bronze depending on the alloy (May be colored to black only).
This process is recommended for aluminum components subject to extreme wear or corrosive environments. It can be used to reconstruct a surface worn or miss-machined part to size.
Please note that Hardcoat Anodizing is more expensive than other types.
Benefits
Improved wear resistance : The coating is harder than tool steel.
As with other types of anodizing, it is non-conductive. The only custom appliable color is black, but it can be buffed, polished or honed.
Can be used to rebuild a worn or miss-machined surface of a part to the desired dimension
Application
Perfect for valves, pistons, sliding parts, rails, bushing, as well as tooling, hinge mechanisms, gears, cams, swivel joint or insulation plates.
What We Do
What is Anodizing ?
Anodizing is an electrochemical process that converts the metal surface into an oxide finish.
At Ultraspec, we treat only aluminum even though nonferrous metals, such as magnesium and titanium, also can be anodized.
Our Process Types
Type I, Chromic Acid Anodizing (CAA)
First commercial type of anodizing, widely used in aerospace and defense. It minimises metal fatigue and is compatible with many aluminum alloys.
Type II, Sulfuric Acid Anodizing (SAA)
Most frequently used type of anodizing, this process will generate a decorative or protective surfaces with a greater durability than surfaces treated with type I. Sulfuric anodize provides a minimum 336 hours of 5% salt spray resistance per ASTM B117.
BAC 5632 / MIL-A-8625 Boric Sulfuric Anodizing
Developed by Boeing Aerospace as a chrome free alternative to type I, for non-critical fatigue part. The adhesion to paint is equal or superior to Type I and this type of anodizing provides corrosion protection.