AnodizingPrice-Koch Industries and Walgren Company have nearly 100 years combined experience providing turnkey anodizing and plating systems and have joined the KOCH Team as PriceWalgren, a division of George Koch Sons.

PriceWalgren logo - ADVERTISING - Version 1With the addition of PriceWalgren, KOCH provides a complete range of automated surface finishing systems, including Anodizing, Electrocoat, Liquid, Plating, Porcelain and Powder systems on all major substrates.

PriceWalgren Anodizing Equipment is used Worldwide for these Processes:

  • TYPE I: CHROMIC ACID (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 electrolyte.
  • TYPE II: SULFURIC ACID (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 (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 (PAA) – 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) – 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.
  • DYE

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.