Aluminum Anodizing Type 3 Hardcoat

Hard Coat AnodizingAluminum Anodizing Type III Hardcoat

Hard Coat Anodizing SERVICES

Hardcoat Anodizing, often called "Type III anodizing" as denoted by the MIL-A-8625 specification, is an electrochemical process that creates a controlled oxide film on the surface of aluminum. Hardcoat Anodizing utilizes sulfuric acid, low bath temperatures, and constant current rectification to achieve a very hard coating (60-70 Rockwell C). Hardcoat Anodizing is generally used for applications that need a corrosion, abrasion, and wear resistant coating. The appearance of the coating ranges from light to dark gray, depending on the alloy makeup of the aluminum substrate, and it can also be dyed black. Parts can be processed with multiple finishes, such as Hard Coat/Chem Film or Hard Coat/Electroless Nickel Plating.

Properties of Hardcoat Anodizing:

  • Compatible with adhesives
  • Excellent lubricity
  • Resistant to marine and atmospheric corrosion
  • High operating temperatures
  • Electrically resistant
  • Galvanic neutrality (prevents galvanic corrosion from interaction between dissimilar metals)

Chem Processing Inc. Type III Anodizing Plating Capabilities:

  • Thickness ranges: 0.0001" to 0.0030"  NOTE: anodizing thickness constitutes 50% build, 50% penetration into the substrate, which must be accounted for when calculating pre-anodize machining tolerances
  • Available with PTFE (Teflon®) impregnation for enhanced tribological properties
  • Rack and bulk processing
  • Precision masking for selective anodizing
  • In-house salt spray testing ber ASTM B 117
  • In-house coating weight analysis
  • Taber abrasion testing
  • Post anodize seals available for increased corrosion resistance but may reduce surface hardness
  • Type I and Type II as masking

Applicable Specifications:

MIL-A-8625F Type III
ASTM B580-79 (Type A)
CP-1000 (UTAS)
AMS 2468 & 2469
SP-222 (Woodward)

Typical Type III Applications:

  • Aerospace/Astrospace/Aviation: wear resistance, dry lubrication, longevity and electrical insulation
  • Firearms: corrosion and wear resistance
  • Machinery: abrasion resistance for high-speed machine parts
  • Electronics: uniform emissivity and a high dielectric
  • Marine/Naval: corrosion resistance in salt-water environments
  • Oil and Petrochemical: corrosion protection and wear resistance.
  • Ordnance: corrosion protection, abrasion resistance and wear resistance
  • Cookware: corrosion protection and non-stick properties
  • Molds and Dies: improved release properties and abrasion resistance
  • Sporting Goods: improved durability and performance

Chem Processing Inc. offers hardcoat anodizing services to Illinois, Wisconsin, Iowa, the Midwest and beyond. CPI is strategically located by highway routes to Chicago, Milwaukee, Madison, St. Louis, and Minneapolis. The CPI facility is minutes from Rockford Chicago International Airport, a major Midwestern air freight hub, enabling efficient door-to-door delivery across the United States or across the globe.

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