ANODIZING SYSTEMS: Anodizing Equipment / Aluminum Finishing
PRICEWalgren is a world leader in the development and adaptation of anodizing equipment for precision applications. Our anodizing equipment is used worldwide for these processes:
- Type I: Chromic Acid Anodizing (CAA) was the first commercial anodizing process. It is primarily used to generate a thin film (.05 to .1 mils) on parts with complex geometries and exceptionally tight tolerances. Type I anodizing is compatible with most alloys and is widely used in aerospace and defense, and wherever critical components have lap joints, recesses, crevices or other features which can trap electrolytes.
- Type II: Sulfuric Acid Anodizing (SAA) is the most frequently used aluminum anodizing process. It produces coatings up to 1 mil for conventional coatings. Conventional coatings are primarily decorative or protective.
- Type III: Hard Coat Anodizing (HCA) processes at higher voltages and current densities. It generates up to 4 mils for hard coatings, and has the highest wear performance – generally Rockwell 60-70C. It produces the smoothest surface and the darkest coloring, and is primarily used for engineering applications.
- Phosphoric Acid Anodizing (PAA) is also The Boeing Company’s BAC5555 process. It is used for structural adhesive bonding, per ASTM-D3933, and substantially improves performance in high-humidity environments.
- Boric & Sulfuric Acid Anodizing (BSAA) was developed by The Boeing Company as a chromic acid anodizing replacement for non-critical fatigue parts. Known as BAC 5632, its acceptance grew as environmental laws increasingly favored the use of chrome-free chemistries. Paint adhesion is equal or superior to chromic acid, and the process is more energy-efficient than chrome-based processes.
- Thin Film Sulfuric Acid (TFSAA)
- Titanium Anodizing
- Bright Dip
- Penetrant Inspection
All of these anodizing processes use controlled electrolytic oxidation to develop a tenacious aluminum oxide coating on the surface of an aluminum sheet or component. Anodizing becomes integral to the substrate: it forms by “growing down” into the metal (about 1/3) and by superficial deposit (about 2/3).
Anodizing substantially increases resistance to corrosion, scratching and wear, provides insulation, maintains high reflectivity, and enhances appearance: coatings are transparent to gray and resist staining. Anodizing can be used alone, and can achieve a variety of color and texture effects through dyeing, electrocolor or interference color.
Some of the world class companies that use our anodizing equipment include Bell Helicopter, Goodrich, Boeing, Alcoa, and the USAF.