Impressed Current Cathodic Protection (ICCP)

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The
principle of impressed current systems is that
§  Voltage difference is maintained
between
HULL ßà ANODES, which protect the hull against
corrosion.
§  Anodes are made of non-consumable
lead/silver, platinum/palladium alloys or platinized titanium.
§  The amount of current is monitored and
controlled by the
controller. Otherwise, there will be
overprotection with wastage of current.
§  Reference cells (made of silver/silver
chloride) detects the voltage between
HULL ßà REFERENCE CELL
§  An amplifier controller is used to amplify the micro-range reference cell current
and it compares this with the preset protective potential value, which is to be
maintained.
§  Using the amplified D.C. signal from
the controller the
reactor
rectifier

supplies larger current from ship’s A.C. power source.
§  Although the first cost is
considerable, the savings on hull maintenance over the life of the ship is
considerable.

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