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Hard Coat Anodizing Services

Hard Coat Anodizing Services
Hard Coat Anodizing Services

We are well-known for providing high strength coatings for many different applications at Nickel Composite Coatings, Inc. (NCC). We provide a number of different finishing options, including hard coat anodizing. Our hard coat anodizing process forms a uniform aluminum oxide layer on the surface with approximately 50% penetration into the material. This process provides numerous benefits, including increased wear and abrasion resistance, excellent protection against corrosion, and better dielectric properties. Our anodizing process meets MIL-A-8625 Type III Class 1 (non-dyed) and Class 2 (dyed) military standards. Working with aluminum and aluminum cast alloy substrates, we provide hard coat anodizing with smoother and harder surfaces than standard anodizing. We use an immersion process with automation capabilities that include time, temperature, and current-based hoist systems. Black is the most-often used color, non-dyed materials typically change to either gray/bronze or gray/black depending on the alloy and thickness of the aluminum. Our anodizing is available with a plating of 12 to 50 microns thick, and our machinery can handle parts up to 4’ high and 3’ in diameter. When the anodizing process is complete, sealing can be performed as a post-plate operation. Sealing is advised when maximum corrosion resistance is required; however, if the main function is for maximum abrasion or wear resistance, sealing should not be performed.

We work in volumes that range from small lots to large volume production runs. To learn more about our hard coat anodizing, please see the information in the below chart, or contact us directly.

Hard Coat Anodizing Highlights

Hard Coat Anodize
Hard Coat Anodizing to MIL-A-8625 Type III Class 1(non-Dyed) and Class 2 (Dyed)
Aluminum Cast Alloys
Coating Characteristics
Wear Resistance
Corrosion Protection
Dielectric Properties
Abrasion Protection
65 to 70 HRC
Thickness Range
12.5 microns – 50.0microns but can be higher for salvage purposes on selected alloys. There is 50% penetration of coating into substrate
Part Height
Up to 4 ft.
Part Length
Up to 3 ft.
Part Geometry Limitations
Avoid or mask the following when designing for an anodized finish

  • blind holes
  • hollow weldments
  • steel inserts
  • sharp corners
  • heavy to thin cross sections
Method of Application
Automation / Manual Capabilities
Hoist System

  • Temperature
  • Time
  • Current
Pre-Plate Operations
Chemical Wash
Post-Plate Operations
Hot Water Seal
Nickel Seal
Post-Coating Operations
Cross sectional thickness analysis
Statistical Process Control (SPC)
Additional Services
Production Volume
Large Volume Production Runs
Small Lots Available

Additional Information

Industry Focus
Aviation and Aerospace
Industry Standards
MIL-A-8625 Type III Class 1(non-Dyed) and Class 2 (Dyed)

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