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Type II Sulfuric Acid Anodize

Type II Sulfuric Acid Anodize for Advanced Manufacturers

Type 2 Anodizing, also called Sulfuric Acid Anodize, is the most common method for anodizing. The process changes the surface of an aluminum substrate material creating a protective aluminum oxide layer.

It is particularly well-suited for applications where hardness and resistance to abrasion is desired.

Sulfuric Acid Anodize also is used to improve surface corrosion and protection under severe service conditions, or as a base for paint systems. The porous nature of sulfuric acid films prior to sealing particularly is used to advantage in the production of colored surface finishes on aluminum and its alloys.

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Sulfuric Acid Anodize Types & Benefits

  • Type II Sulfuric Acid Anodize
    • The conventional sulfuric acid anodizing treatment
  • Type IIB
    • A non-chromate alternative to Type I coatings, where corrosion resistance, paint adhesion, and fatigue resistance are all required.
    • Provides better corrosion resistance than Chem Film and provides adequate base for organic paint finishes
    • Corrosion protection
    • Abrasion resistance
    • Increased hardness
    • Improved Thermal or electrical insulation
    • Increased lubricity
    • A much thinner coating compared to paints or powder-coat finishes
    • The dimensional build-up often can be ignored for machined parts

Frequently Asked Questions

Type II Sulfuric Acid Anodize Properties & Benefits
  • Coating Thickness: ~ .0001 to .001 inches, depending on specs/process or alloy
    • Note: Anodize Coating Thickness is surface penetration plus surface build-up
  • Substrates: A wide variety of aluminum alloys
    • Including 1100, 2000, 3000, 5000, 6000, and 7000 series alloys
    • Note: Please click through to the individual spec pages (linked below) to see the standard coating thickness for specific alloys
  • Additional Benefits
  • Compared to Type 1 Chromic Acid Anodizing
    • More aluminum alloys can be finished compared to other processes
    • Clearer finish permits dying with a greater variety of colors
    • Less expensive than other Anodize processes with respect to the chemicals used, less heating & power consumption
    • Shorter plating time to reach specified thickness
Sulfuric Acid Anodize Applications & Industries
  • Military weapons
  • Optical components
  • Medical components
  • Mechanical hardware
  • Decorative applications
  • Computer & electronic enclosures
  • Hydraulic valve bodies
Sulfuric Acid Anodize Specs & Certifications
  • AMS-A-8625 --- NADCAP Approved, ROHS Compliant
  • MIL-A-8625 --- NADCAP Approved, ROHS Compliant

Looking for Specs?

Learn more about the specifications AOTCO offers, including NADCAP-accredited and RoHS-compliant ones.
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