A galvanic anode, cathodic protection (CP) system & twin brass propellers under the keel; Iceland Stàlsmiðjan ship repair facilities, in Iceland which have a long tradition in shipbuilding, ship repair, and steel welding. Twin propellers under the keel on the steel hull of a new ship.
Cathodic protection (CP) is a technique used to control the corrosion of a metal surface by making it the cathode of an electrochemical cell.[1] A simple method of protection connects the metal to be protected to a more easily corroded "sacrificial metal" to act as the anode. The sacrificial metal then corrodes instead of the protected metal. For structures such as long pipelines, where passive galvanic cathodic protection is not adequate, an external DC electrical power source is used to provide sufficient current.
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