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Corrosion causes frictional drag of the
ship's hull which in turn leads to higher operating cost. A high
quality coating provides a smooth hull and together with a well
engineered cathodic protection system, helps to ensure that the
surface is maintained in good condition.
Sacrificial anode systems are
commonly used for external hull cathodic protection as they are
virtually maintenance free. Anodes for the external hull are
designed to protect local areas and are evenly spread to ensure a
good distribution of current.
Anodes located in the stern area
are normally spaced closer together because turbulence in this
area increases oxygen content in the water making it more
corrosive and hence a higher current density is required to
provide cathodic protection.
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