Types of anodizing:  Type I Anodizing - Chromic Acid also known as CAA or Chromic Acid Anodize.  Type II Anodizing - Sulfuric Acid or Sulfuric Acid Anodize SAA.  Type III Anodizing - Hard coat or  Hardcoat Anodizing HCA.
Architectural AnodizingAutomotive AnodizingMedical Components Anodizing, Stainless Steel Passivation, ElectropolishMilitary and Aerospace Anodizing

Walgren has more than 350 anodize systems worldwide

Walgren specializes in turnkey anodizing equipment that includes material handling, environmental management, controls, and auxiliary equipment.

Visit this page for a list of customers who chose a Walgren hardcoat anodizing or other finishing system.

Terry Hutchins
Palm Inc.
"Our customer bought an automated anodizing system for automotive aluminum trim. Walgren has been very supportive of its products, very responsible."

Chad Whitehead
"Walgren's knowledge of chemical processing, particularly anodizing, is great. Anybody can build equipment or a tank with a set of plans, but the trick is in applying it to what customers want to achieve. Walgren has excellent knowledge of the chemical industry and the equipment they supply. "

William "Bill" Rudder
"I was involved in specifying and purchasing equipment for an anodizing line for aerospace parts. We had a great experience in ordering and installing our anodizing line. We'd be glad to deal with Walgren again
for future installations."


Walgren is a leader in plating waste treatment and recovery systems, also air pollution control for plating and finishing systems. Visit our Environmental Management page for details.

Anodizing Equipment / Aluminum Finishing

Walgren is a world leader in the development and adaptation of anodizing equipment for precision applications. Walgren anodizing equipment is used worldwide for these processes:

  • Chromic acid: Type I, also known as CAA or Chromic Acid Anodize, 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 electrolyte.
  • Type II, SAA, or Sulfuric Acid Anodize 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.
  • Hard coat: Type III, HCA or hardcoat anodizing 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: PAA, phosphoric acid anodizing is also Boeing's BAC5555 process. It is used for structural adhesive bonding, per ASTM-D3933, and substantially improves performance in high-humidity environments.
  • Boric & Sulfuric acid: BSAA, Boric Sulfuric Acid anodize, The Boeing Company developed this process 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
  • Tartaric acid anodizing
  • Chem film
  • Sealing
  • Bright dip
  • Dye 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 Walgren anodizing equipment include Bell Helicopter, Goodrich, Boeing, Alcoa, and the USAF. 

See these pages for information on Walgren Anodize technology as it applies to these industries:
Architectural Anodizing
Automotive Anodizing
Medical Components Anodizing, Stainless Steel Passivation, Electropolish
Military and Aerospace Anodizing

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Environmental equipment supplied by Walgren includes etch enclosures, bright dip enclosures, automatic and manual tank covers, hoist drip trays and enclosures, counterflow rinse systems, Etch - Chrome - Nickel recovery, scrubbers, mist eliminators, water c Koch Enterprises, Inc. Koch LLC Price-Koch Industries Price Walgren, LLC