Aluminum cathodes are now the most widely used cathode materials for the anodizing process. Aluminum has replaced lead, recognizing the inherent inefficiencies in the electrical carrying capacity of this material. We base the system on a 3/1 to 5/1 ratio of anode to cathode. This forces the electrical current and reduces film thickness variation within anodizing loads.

We completed a survey of anodizers to review typical failure of aluminum cathode bars. Typical failure occurred at the base of the extrusion fin or burn through of the back wall.

This led to our design of cathode system based on the principle of perfect symmetry. The fins, wall, thickness, and distance are all .375 inches thick. This symmetry maintains the integrity of the current flow while minimizing the weight and cost. Our design gives twice the usable cathode surface area than flat bar or sheet aluminum.

We use 6063 T-6 alloy aluminum for our extrusions to provide good corrosion resistance in the sulfuric acid environment. Assistance is provided for sizing a system.

Our Stock size for extrusions is 90-inch lengths. Custom lengths are available on request.

This is the cross section of our design