SYSTEM OPERATIONS-11
The purpose of these Sacrifi cial Zinc Anodes is
to attract any destructive electrical currents away
from the metallic underwater components; thereby
preventing their eventual corrosion and allowing the
corrosion of the sacrifi cial zinc anodes. The sacrifi cial
zinc anodes are considerably easier and cheaper
to replace and their deterioration will not affect the
performance of your yacht, as would the deterioration
of a propeller or rudder.
The Bonding System is a network of wires (color
coded green) that are connected to all metallic un-
derwater 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 Sacrifi cial Zinc Anode, located on the Transom,
which allows corrosion of the anode but prevents
corrosion of the underwater components.
General maintenance of the Bonding System con-
sists of yearly replacement of the Sacrifi cial Zinc
Anode, located on the transom. All other zinc anodes
located on the Propeller Shafts, Rudders, etc., should
be completed during the spring launch procedure.
Depending on your docking location and the length
of your boating season, the anodes may require more
frequent replacement. If possible, check the anodes
for excessive corrosion midway through your boating
season. If excessive corrosion is noted, have your
dealer or a competent technician replace the sacri-
fi cial zinc anodes. Periodically check the continuity
wiring connections to make sure they are tight and
free of corrosion. Tighten and clean connections as
necessary.
NOTE: Silverton recommends placing Sacrifi cial Zinc
Anodes on the following components:
Propeller shafts
Rudders
Trim Tabs
IMPORTANT: DO NOT paint any of the Sacrifi cial
Zinc Anodes as it will retard the fl ow of electric current
through them and render them ineffective.
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The purpose of the Bonding System is to protect
your yacht’s underwater components from electroly-
sis and galvanic corrosion. 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 positions in
the galvanic rating table will determine which metal
loses material (anode) and which metal remains
largely undisturbed (cathode). The distance apart
on the galvanic table of the two metals determines
the rate of wear.
To help prevent corrosion, Sacrifi cial Zinc Anodes
are fi tted to the underwater components of your
yacht, such as the propeller shafts and rudders.
A large sacrifi 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.
BONDING SYSTEM
Sacrifical Zinc Anodes
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