GENERAL CARE AND MAINTENANCE
© 2003-2018 Ken Cook Co.
SECTION
10
Bass l
10 - 7
SACRIFICIAL ANODES
Anodes (sometimes called “zincs”) are used to protect hardware exposed to the
water. Since galvanic corrosion attacks the least “noble” metals first, less noble
metal anodes are used to purposefully “sacrifice” themselves, thereby protecting
the more noble metals of the drives, propeller, tabs, boarding platform and other
metal items below the waterline (such as underwater gear).
Anodes may be installed on the boat transom and/or bottom at the factory.
Additional anodes may be installed on the underwater gear as well as any metal
components exposed to raw water, such as heat exchangers and water cooling
jackets. Anodes are made in three different metals which must be matched to the
water type and local conditions. Most boats are equipped from the factory with zinc
anodes on the recommendation from engine and drive manufacturers. The anodes
that are installed on the trim tabs are typically zinc and are isolated from the boat
bonding system.
Selection, monitoring and replacement of the anodes on the transom, drives, trim
tabs, boarding platform supports and other underwater gear is the customer’s
maintenance responsibility. Any damage done because of lack of maintenance will
not be covered under warranty.
WATER TYPE ANODE MATERIAL REPLACE AT
Salt water Zinc 40% decomposition
Brackish water Aluminum 50% decomposition
Fresh water (clean) Aluminum/magnesium alloy 50% decomposition
Fresh water (polluted) Magnesium 40% decomposition
Least Active
Order of Activity of Metals:
(Most Noble)
Most Active
(Least Noble)
Aluminum/
Indium Alloy
Galvanized
Iron
Mild Steel Tin Naval Brass
(60% Copper
30% Zinc)
Brass
(60/40 Alloy)
Titanium Platinum
GoldSilverCopperZincMagnesium Aluminum
Passive
Stainless/Steel
Manganese
Bronze
Active
Stainless Steel
KC-6009
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