Zinc & Aluminum Anodes
Harbor Island Supply produces zinc and aluminum anodes for Cathodic Protection. HARBOR Zinc Anodes conform to MIL-A-18001K, while HARBALUM Aluminum Anodes meet MIL-A-24779.

Custom Casting Facility
Harbor Island Supply is a third generation family owned casting facility that operates out of our 22,000 square foot plant, and has been manufacturing anodes, or "zincs" as they are commonly known, since 1981.

Complete Line Of Anodes
Harbor Island Supply produces a complete line of anodes including anodes for ships, barges, tugboats and other workboats, engine anodes or pencil zincs, heat exchanger and condenser anodes, cast plates, keel cooler anodes, zinc propeller nut caps, pier anodes, piling anodes and submerged pipeline anodes. We also provide shaft collar zincs, donut collar zincs, rudder disc zincs, Mercury anodes, Volvo zincs, OMC zincs, Honda zincs, Yamaha zincs and Nissan zincs.

Magnesium Anodes

Magnesium anodes include both bare and plastisol coating for marine use, magnesium backfill anodes for ground installations, and magnesium rod for boiler and tank systems.

Galvanic Corrosion
Galvanic Corrosion is created when metals of different potentials are attached to each other and submerged in water or any solution that carries electrical current. Since different metals corrode at different rates, a current flow will be created from the faster corroding metal (anode) to the slower corroding metal (cathode). A reliable anode must be capable of continuously supplying electrical current throughout its life. HARBOR anodes are made from high purity base metals before being alloyed with controlled amounts of additives to enhance electrochemical properties and to offset the small amount of impurities that detract from current output. Improper or unalloyed anodes start off with a high current output which tapers off over time, thus providing insufficient current for long term protection.