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Aluminum Hard Coating Anodizing Services

Hard coat anodizing is a proven electrochemical process that transforms a plain metal surface into an engaging exterior that provides both advanced corrosion-resistance and durability. The key difference between aluminum hard coating and standard anodization is that the process provides the surface with greater wear resistance and a smoother and harder finish. The aluminum hard coating process is ideal for transforming the surfaces of aluminum and all other types of nonferrous metals. These premium materials are used by numerous industries throughout the world to manufacture thousands of consumer, commercial, and industrial products.

Contact us for more information about our Minnesota-based advanced aluminum anodizing services and aluminum hard coating capabilities, or call us at 800-813-0383 with any questions that you may have.


The Aluminum Hard Coating Anodizing Process

Our custom engineered anodizing process begins by creating a uniform aluminum oxide layer that penetrates the surface of the material. The part(s) are then placed in a sulfuric acid bath at approximately 32°F, with a density of 23 to 37 amps, for anywhere from 20 minutes to two hours. The amount of time spent submerged determines the thickness of the coating.

Benefits of Hard Anodizing

Hard coat aluminum anodizing services with Arrow Cryogenics provides anodized aluminum coating that meets Military Standard Specifications MIL-A-8625 and is available in Type III Class 1 (Non-Dyed) and Class 2 (Dyed) options. Our custom anodizing services provide strength and corrosion resistance for a range of applications. Aluminum hard coating also improves the overall aesthetics of the aluminum.

Additional benefits of engineered anodizing include: 

  • Easier to clean and maintain
  • Improved lubrication
  • Resistance to peeling, flaking, and chipping
  • Increased abrasion resistance
  • Flame resistance
  • Non-contaminating (for medical instrumentation)

Custom Aluminum Anodizing Services for Your Project Needs

Aluminum hard anodizing, also known as MIL-A-8625 Type III or engineered anodizing, is similar to standard anodizing in that both are controlled electrochemical processes. However, hard anodizing is commonly performed clear or with a black dyed finish, though some prefer the aluminum dyed different colors for aesthetic purposes. Arrow Cryogenics provides both color anodizing services, as well as custom services for hard coated clear anodized aluminum.

Over time aluminum naturally forms an oxidized exterior. However, our type III custom anodizing services provide a surface that is more uniform, dense, and much harder than naturally oxidized surfaces in a quick and effective process that does not require extensive waiting. This coating is ideal for finishing guns and firearms due to its thick, hard surface and resistance to corrosion.

At our state-of-the-art facility in Blaine, Minnesota, Arrow Cryogenics offers aluminum hard coat color anodizing services (Type III) and clear anodized aluminum services for dyed and non-dyed parts. We also provide standard aluminum anodizing (Type II) services. 

Aluminum Hard Coating Applications

Hard coated custom anodizing services provide low-maintenance durability and can be used for a wide range of applications. Various industries benefit from the use of anodized aluminum parts, including:  

Hard Coat Color Anodizing Services

Depending on the alloy and the coating thickness, Arrow Cryogenics color anodizing services can provide numerous shade options. To provide the best color coating options, sampling is required if a color other than black is needed. For example, the color of the aluminum after being hard coat anodized depends on the alloy and the thickness of the coating. On some alloys, the color of non-dyed (MIL-A-8625 Type III Class I) aluminum after hard anodizing will change to a gray/bronze color; on others, the aluminum will turn gray-black. If the aluminum is dyed (Class II), black is the most commonly used color.

Aluminum Hard Coating Sealing Services

For applications that do not require maximum abrasion or wear resistance, we also offer aluminum hard coating sealing services. If the main function of the application is for corrosion resistance, and reduced abrasion resistance is not an issue, sealing is advised on dyed parts.

Hard-Coat Aluminum Firearm Anodizing

Our hard coat anodizing results in an ultra-hard coating that's ideal for firearm finishing. The Type III aluminum anodizing process provides a thick, densely-packed pore structure for increased strength and corrosion resistance. Our aluminum hard coat gun finishes provide:

  • An easy-to-clean surface
  • Improved lubrication
  • Increased abrasion resistance
  • Flame resistance

NADCAP Certified Hard Coating Aluminum Anodizing Solutions

Arrow Cryogenics is ISO 9001:2015 and Nadcap certified for chemical processing and is in compliance with the AC7004 Aerospace Quality System for the Aircraft, Space and Defense Industry. As part of Nadcap accreditation, our processes were audited based on stringent industry guidelines and are regularly reviewed to maintain compliance.