Sulfuric Anodize

 Sulfuric Acid Anodize (aka Type II) is the most common method for anodizing. It is particularly suited for applications where hardness and resistance to abrasion is required. Sulfuric-anodize 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 is used to particular advantage in the production of colored surface finishes on aluminum and its alloys.

Sulfuric Anodize Features 
  1. More aluminum alloys can be finished compared to other processes
  2. Clearer finish permits dying with a greater variety of colors (see: anodize color)
  3. Less expensive than other Anodize processes with respect to the chemicals used,
    less heating & power consumption, & less plating time to reach specified thickness .
  4. A much thinner coating compared to paints or powder-coat finishes.
    The dimensional BUILD-UP can often be ignored for machined parts.
  • Military weapons
  • Optical components & Medical components
  • Mechanical hardware or Decorative applications
  • Computer & electronic enclosures
  • Hydraulic valve bodies  –  and more!

At Aotco, we plate to your specified coating requirements.

 Sulfuric Anodize coatings thickness can range from ~ .0001″ to .001″,  depending on specs/process or alloy
**Anodize thickness=  penetration + build-up** 

Please visit our “Anodize Coating” page to learn more about Sulfuric Anodize coating


Aotco also offers a Type IIB sulfuric-anodize process.
Type IIB is a very thin sulfuric-anodize coating that is used as a non-chrome alternative to Type I chromic anodize.
It provides better corrosion resistance than Chem Film & provides adequate base for organic paint finishes.
(Please reference the Anodize Coating page for details about this spec.)