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For ICCP on ships, a DC power supply is provided within the ship and the anodes mounted

on the outside of the hull. The anode cables are introduced into the ship via acompression

seal fittingand routed to the DC power source. The negative cable from the power supply is

simply attached to the hull to complete the circuit. Ship ICCP anodes are flush-mounted,

minimizing the effects of drag on the ship, and located a minimum 5 ft below the lightload

line[19]in an area to avoid mechanical damage. The current density required for protection is a

function of velocity and considered when selecting the current capacity and location of anode

placement on the hull.

Some ships may require specialist treatment, for example aluminium hulls with steel fixtures

will create an electrochemical cell where the aluminium hull can act as a galvanic anode and

corrosion is enhanced. In cases like this, aluminium or zinc galvanic anodes can be used tooffset the potential difference between the aluminium hull and the steel fixture.[20]If the steel

fixtures are large, several galvanic anodes may be required, or even a small ICCP system.

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