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The Use of ICCP-Systems on Azimuth Propulsor Vessels
Problemfree Corrosion Protection?
This
document was prepared to clarify the use of Impressed
Current Cathodic Protection systems (ICCP systems)
on board ships; the advantages, disadvantages and
what should be taken into account when such systems
are considered. The need for this data is obvious
- there has been an increased interest in this type
of corrosion protection, thanks to improved technology
and availability. However, when an ICCP system is
used, the complete vessel, including the propulsion
system, need to be taken into account.
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In
order to understand the vocabulary used, first the
definition and some technical background for the
cathodic protection itself.
| Cathodic
Protection |
Reduction
of the corrosion rate by shifting the corrosion
potential of the electrode toward a less
oxidizing potential by applying an external
electromotive force.
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| Galvanic
Anode |
A
metal, which, because of its relative position
in the galvanic series, provides sacrificial
protection to metals, that are nobler in
the series, when coupled in an electrolyte
(e.g. seawater).
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| Galvanic
Cathodic Protection System |
A
cathodic protection system in which the
external electromotive force is supplied
by a galvanic anode, typically zink anodes.
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| Impressed
Current Cathodic Protection System |
A
cathodic protection system in which the
external electromotive force is provided
by an external DC power source.
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| Ground
Bed |
One
or more anodes installed on the surface
for the purpose of supplying cathodic protection.
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| Distributed
Anode Ground Bed |
A
group of anodes installed close to and along
a structure to be protected.
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