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Sacrificial Zinc Shaft Anodes - Standard
Description
Whenever you have two or more dissimilar metals in contact, or in close proximity to each other, in combination of an electrolyte i.e salt water, a small electric current will flow from the most noble metal(cathodic) to the least noble metal(anodic). When this occurs, the least noble metal will be attacked and gradually destroyed in what is commonly called "galvanic corrosion". The intensity of this attack will vary according to the relative position of metals on the Galvanic Series List. The further apart the metals are, the faster it occurs and the worst the effects are. The relative areas or the mass of the metals also has a bearing. To overcome this it is common practise (and prudent!) to electrically connect all underwater metals components that are in contact or close proximity to each other to a zinc alloy block. Because zinc is one of the least noble or anodic metals, it will be eaten away first, rather than those other inexpensive and unneccessary metal objects under the water, such as your propellor, rudder, shaft etc !! Hence the term "Sacrificial anode.
All our zinc anodes conform to the zinc alloy composition designated in Australian Standard 2239-Z1, as well as U.S. Naval Mil.Spec. MIL-A-18001, recognised as the world standard for anode quality.
These anodes come in two halves and are placed around the propellor shaft or rudder post, held in place by the tension you apply to the fasteners as you clamp it back together again.