Page 398 - Vetus

ALUMINIUM AND ZINC ANODES

Protection by means of anodes is a ”must” for all metal parts under water. Type of anode material
Therefore anodes are required for wooden, fibre glass and aluminium hulls. The
material of V-Quipment zinc anodes is of the highest possible standard, the U.S. Type Type of alloy according to
mil.-A-18001 K. specifications. Anodes which do not meet these specifications have Zinc MIL-A-18001K
little or no effect.
Aluminium MIL-A-24779 (sh)
V-Quipment aluminium anodes consist of an aluminium-indium-zinc alloy
Mil - A - 24779 (SH). All V-Quipment anodes are streamlined and mounted either with
studs which can be welded to a steel hull, or with through-hull bolts for fibreglass
and wooden boats. We supply these studs and bolts separately.

For vessels, which mostly cruise on inland (fresh) waters, we recommend aluminium anodes since aluminium has a greater
difference of potential with other metals than zinc. This is very important, as fresh water provides a higher electrical resistance
than salt water. For sailing on salt water or brackish water, we recommend the use of zinc anodes. Aluminium anodes also function
well in salt water, but are sacrificed at a much faster rate. We do not recommend the use of magnesium anodes, as the difference
of potential with other metals is too great which could cause damage to the hull paint, especially when sailing in brackish or salt
waters.

Use the table below to select the right anode suitable for the type of water in which the boat is generally used.

Hull material
Water type Wood GRP Aluminium Steel Sterndrive/ outboard
Fresh Aluminium Aluminium Aluminium Aluminium Aluminium
Brackish Zinc/ Aluminium Zinc/ Aluminium Zinc/ Aluminium Zinc/ Aluminium Aluminium
Salt Zinc/ Aluminium Zinc/ Aluminium Zinc/ Aluminium Zinc/ Aluminium Aluminium
An annual inspection of the anode is needed, it should be replaced when the anode has been 50% sacrified.

Bolt-on Series

70
ALU08C ALU15C
74
ZINK08C ZINK15C 150
45
25
Ø 90

ALU25C ALU35C

ZINK25C ZINK35C

75
80

140 200
250
300
30
35

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