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.
- 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.
- Many alloys can be processed.
- Film is thicker and harder than chromic anodize.
- Surface finish will turn light grey naturally and can be colored.
- Good for Bonding
- Architectural extrusion and sheet
- External Structures - curtain wall
- Optical components
- Hydraulic valve bodies
- Military applications
- Computer and electronic enclosures
- Mechanical hardware
- Paint/prime base