42C System Operations - 11
BONDING SYSTEM
The purpose of the Bonding System is to
protect your yacht’s underwater compo-
nents from electrolysis and galvanic corro-
sion. Examples of underwater components
would be the propellers, propeller shafts,
rudders, engine/generator, and seawater
intake valves.
Electrolysis and galvanic corrosion occurs
primarily in salt water, but can occur to a
lesser degree in fresh water. Salt water
allows electric current to
fl
ow from anodic
to cathodic material. Any two metals from
two components and their relative posi-
tions in the galvanic rating table will deter-
mine which metal loses material (anode)
and which metal remains largely undis-
turbed (cathode). The distance apart on
the galvanic table of the two metals deter-
mines the rate of wear.
To help prevent corrosion, sacri
fi
cial zinc
anodes are
fi
tted to the underwater com-
ponents of your yacht, such as the propel-
ler shafts and rudders. A large sacri
fi
cial
zinc anode plate is also attached to the
underwater area of the transom.
The anodes on the rudder, shaft, and trim
tabs are installed by your Silverton Dealer.
The purpose of these sacri
fi
cial zinc an-
odes is to attract any destructive electrical
currents away from the metallic underwa-
ter components, thereby preventing their
eventual corrosion and allowing the cor-
rosion of the sacri
fi
cial zinc anodes. The
sacri
fi
cial zinc anodes are considerably
easier and cheaper to replace and their
deterioration will not affect the perfor-
mance of your yacht, as would the deterio-
ration of a propeller or rudder.
The Bonding System is a network of wires
(color coded green) that are connected to
all metallic underwater components within
the interior of the hull; which makes them
one unit for electrical current purposes.
This network of wires is then attached to
the sacri
fi
cial zinc anode located on the
transom, which allows corrosion of the
anode but prevents corrosion of the un-
derwater components.
General maintenance of the Bonding
System consists of yearly replacement of
the sacri
fi
cial zinc anode located on the
transom and all other zinc anodes located
Summary of Contents for 42 C
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Page 6: ...INTRODUCTION 6...
Page 8: ...INTRODUCTION 8...
Page 12: ...INTRODUCTION 12...
Page 25: ...42C Getting Familiar 5 DECK...
Page 28: ...42C Getting Familiar 8...
Page 32: ...42C Getting Familiar 12...
Page 34: ...42C Getting Familiar 14...
Page 39: ...42C Getting Familiar 19 ENGINE COMPARTMENT...
Page 58: ...SAFETY 18...
Page 64: ...42C System Operations 6...
Page 66: ...42C System Operations 8...
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Page 150: ...OPERATION 6...
Page 158: ...GLOSSARY 6...
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Page 161: ...GLOSSARY 9 MAINTENANCE LOG DATE MAINTENANCE PERFORMED HOURMETER...
Page 162: ...GLOSSARY 10 MAINTENANCE LOG DATE MAINTENANCE PERFORMED HOURMETER...
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