Ball Anode Zinc for 25mm Shaft

Shaft anodes are mounted on the shafts of small leisure vessels to protect the exposed steel prolonging the life of the shafts and propellers. Zinc is the only material that has an official specification, the American MIL-A-18001 K spec. Zinc is a well-proven anode material, and its capacity is virtually unaffected by the operating current density, although the driving voltage diminishes with increasing temperature therefore it has limited application. If zinc is not to this specification i.e. high purity zinc 99.99%, it will have a limited use as an anode material because of iron present as an impurity.