Category Marine Industry

Active Shaft Grounding System

One of the most critical elements in the propulsion system of a marine vessel is the shaft. Propulsion systems with shafts that become corroded over time due to electrochemical potential between the metal shaft and seawater lose their efficiency at transferring work or energy from the vessel’s engine to its exterior propulsion system, which provides thrust to move the vessel forward. Overly corroded shafts can lead to system failure. Therefore, cathodic protection is provided for the shaft in order to protect the working metal (transferring engine energy) from corrosion. An outer “sacrificial” layer of metal is provided around the shaft such that the electrochemical potential from seawater will be attracted to the outer layer as opposed to the shaft itself.

In passive systems (such as wit...

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