Standard Anodizing (Type II)

Arrow Cryogenics' aluminum anodizing meets the following mil spec requirements:

  • MIL-A-8625 Type II Class 1 (Non-Dyed) and Class 2 (Dyed) conventional aluminum anodizing process using sulfuric acid

Nordic Components video "Made for the Outdoors" featuring Arrow Cryogenics
segment beginning at approximately the 13:40 mark through 15:55.

Standard Anodizing (Type II)

Arrow Cryogenics offers standard (MIL-A-8625 Type II) aluminum anodizing at our state-of-the-art facility in Blaine, Minnesota. We also provide hard coat anodizing (MIL-A-8625 Type III). Our anodized coatings can be customized to meet specifications requirements for coating weight, corrosion resistance, paint adhesion, and abrasion resistance. In addition, we have our own strict guidelines for appearance, workmanship, inspection, testing, and more.


What is Aluminum Anodizing?

Aluminum anodizing is a controlled electrochemical process that increases the thickness of the oxide layers that naturally exist on aluminum surfaces, improving corrosion resistance. Anodized coatings also provide better adhesion for paint primers and glues, and can be used for numerous aesthetic purposes as well.

During the aluminum anodizing process, DC electricity is passed through an electrolytic solution in which the aluminum work piece is submerged. The electrical current causes the release of oxygen on the surface of the aluminum, creating a buildup of aluminum oxide. The resulting anodic film is considerably denser than natural oxidation and is uniform across the surface of the workpiece. In short, aluminum anodizing creates an oxide coating that protects and/or enhances the look of the final product.

Advantages of Standard Aluminum Anodizing:

  • Corrosion resistance
  • Dielectric properties
  • Aesthetics
  • Better bonding
  • Non-contaminating (medical instrumentation, etc.)

How Does Aluminum Anodizing Affect Dimensions?

When anodizing aluminum parts with tight dimensions, it is important to understand that the coating will affect the final dimensions. In general, 50% of an anodized coating will penetrate into the material's surface, and 50% of the coating builds up on the surface. The change in final dimensions is determined by the thickness of the coating. Using state-of-the-art controls, Arrow Cryogenics can control the thickness of our coatings with exceptional accuracy. We work closely with our customers to ensure that all tolerances are met.

Anodizing Can Alter the Finish of Treated Parts

By using special chemicals during the pretreatment of aluminum that is to be anodized, we are able to achieve a satin finish. Many of our customers request this finish for reasons including:

  • To blend in machining lines
  • To blend in extrusion lines
  • To blend in scratches caused during manufacturing
  • To reduce glare

Dyeing/Coloring After Anodizing

After anodizing, parts can either be left undyed (Class 1) or dyed in an array of colors (Class 2).

Silver metallic aluminum color

By using dyes following the anodizing process, Arrow Cryogenics can achieve numerous colors. After the aluminum is dyed, the color is then sealed into the aluminum.

Below are the colors we are currently able to apply to anodized aluminum:

brown aluminum color     blue aluminum color     purple aluminum color

red aluminum color     black aluminum color     green aluminum color

Note: Colors shown are for general reference only and may be affected by the color settings on your computer monitor.

Other colors may be available upon request.

Arrow Cryogenics is an ISO:9000:2001 certified company.

Please contact us for more information about our aluminum anodizing services.