Anodizing Aluminum: A Full Range Of Services from AACOA

Many customers choose to work with AACOA because we offer a comprehensive spectrum of anodizing processes and the ability to anodize extruded, cast or sheet aluminum projects. AACOA has become an expert at anodizing fabricated parts and welded assemblies. Also, when multiple processes are required for a given project, it is more cost-effective for a single, qualified anodizing company to perform them all.

Clear Sulfuric Anodizing

Clear sulfuric anodizing is an electrochemical process in which aluminum is immersed in a sulfuric acid electrolyte through which electrical current is passed. The aluminum is the anode and the tank is the cathode. Voltage applied across the anode and cathode causes negatively charged anions to migrate to the anode, where the oxygen in the anions combines with aluminum to form an aluminum oxide coating. The coating may be produced in various thicknesses to achieve desired specifications.

Organic/Inorganic Dyestuffs Coloring

Production of absorptive dyed finishes starts with conventional sulfuric acid anodizing in which a clear aluminum oxide film is produced. Specifications for anodic film thickness and density are critical at this stage. The anodized aluminum is then immersed in a heated solution of either organic or inorganic dyestuffs. The dye is absorbed into the pores of the anodic coating providing a pigmentary color to the surface of the aluminum.

Electrolytic Coloring

Production of Sandocolor® and Anolok® starts with conventional sulfuric acid anodizing in which a clear aluminum oxide film is produced. Specifications for anodic film thickness and density are critical at this stage. Sandocolor® requires thicker coatings and is well suited for architectural applications. Anolok® can be utilized on thinner coatings making Anolok® more desirable for automotive applications. At the next stage, an electrolytic process deposits an elemental metal at the base of the anodic film. Sandocolor® utilizes the metal tin, whereas Anolok® utilizes the metal cobalt. Colors achieved are the result of an optical effect, not pigmentation, and are totally immune to damaging ultra-violet light.

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AACOA is a leader in aluminum extrusion and fabrication, as well as aluminum anodizing. Operating state-of-the-art plants in Niles, Michigan and Elkhart, Indiana, AACOA serves customers throughout the Midwest and the entire U.S.

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