Type II, Sulfuric Acid Anodizing (SAA)

 
Most frequently used type of anodizing, this process will generate a decorative or protective surfaces with a greater durability than surfaces treated with type I. Sulfuric anodize provides a minimum 336 hours of 5% salt spray resistance per ASTM B117.
 
  • Description 
    • Most common process for commercial anodizing.
    • Films range from .0001"-.001" thick.
    • The overall thickness of the coating formed mainly in penetration of the substrate (67%). Considering the preparation of the part, etch and deoxidized, there is no modification of the final dimensions of the part.
    • Adds minimal hardness and abrasion resistance.
    • Sulfuric anodized film can be color prior to sealing.
  • Benefits       
    • Many alloys can be processed.        
    • Film is thicker and harder than chromic anodize.
    • Surface finish will turn light grey naturally and can be colored.
    • Non-Conductive
    • Good for Bonding
  • Application
    • Architectural extrusion and sheet
    • External Structures - curtain wall        
    • Optical components
    • Hydraulic valve bodies
    • Military applications
    • Computer and electronic enclosures
    • Mechanical hardware
    • Paint/prime base