In cathodic protection, pieces of metal (known as Sacrificial Anode) are linked electrically to the ship’s hull. These anodes, are made of metals more reactive than the material used for the ship’s body and systems. As such, they will corrode in place of the ship’s body and systems while the ship stays protected, giving rise to the name ‘Sacrificial Anodes’.
Usually, zinc anodes are mostly used in sweet or saline watered environment (soil). Special application is the cathodic protection of the road crossings and the casing. They can’t be used in extreme high alkali (over 9.2 PH), or acid (under 5 PH) environment. Outside/Inside operating, heating range: 0 oC / +60 oC.
Zinc anodes, also called "sacrificial anodes," protect all of the metal parts located underneath the water line (hull) from corrosion. In order to protect the boat's hull from corrosion, the hull is connected to a more inferior metal (anodes), which are oxidized more easily. For example: A zinc anode is attached to a boat with a steel-alloy hull, which causes the inferior metal of the anode (zinc) to sacrifice itself, in order to protect the high-quality metal of the boat's hull from corrosion.
Usually "sacrificial anodes" have to be changed after each season, even more frequently in highly corrosive waters. The anodes are attached along the keel. The current intensity is larger at the hind steven, due to the position of the propeller. It is advisable to use several anodes. Anodes should also be attached to the rudder blade and propeller shaft. For vessels mainly operated in fresh water, we recommend using aluminum anodes because of the greater potential difference it has to other metals, in comparison to zinc.
Zinc Anodes are cast from a high purity zinc alloy to ensure an even corrosion pattern, reliable electrical efficiency and long working life. The zinc alloy is in accordance with the standarts specifications.
More İnformation please see following links.
EDO-DRG-COE-COR-INT-XXX-020-875-1718-Rev-B-EDO-ZN-XXX TYPE ZINC ANODES DETAIL
EDO-DRG-COE-COR-INT-XXX-020-876-1719-Rev-A-SEA TYPE ZINC ANODE DETAIL EDO-ZN-XXX
EDO-SPC-COE-COR-INT-XXX-016-718-935-Rev-A-EDO-ZN-XXX-TYPE PRE-PACKAGED ZINC ANODES BROCHURE