Corrosion Protection; Sacrificial Anodes - Tayana -48 Owner's Manual

2.12 Corrosion Protection

(Sacrificial Anodes)

Sacrificial anodes are fitted to the boat to protect this under
water metallic parts i.e. propellers, shaft, skin fittings, etc, from
corrosion. The main anodes are fitted at transom. The shaft,
rudder have anodes fitted as well.
These should be replaced when about half of the anode has
been consumed. It can depend very much on the environment in
which the boat is moored as to the length of time the anodes will
last. It can range from 4 months to 12 months. We
recommended that they be inspected every 3 months.
！
IN ANODES ARE ALLOWED TO CORRODE AWAY
TOTALLY, THIS COULD RESULT IN SERIOUS PARTS
WITH THE POSSIBILITY OF THE BOAT SINKING
Crevice Corrosion
When your vessel is in wet storage, rotate both propeller shafts
about once a week to prevent crevice corrosion, which may
occur in the area of struts and shaft logs if the shafts stay in the
water in the same position over a long period
Electrolysis
If your vessel is idle for extended periods, we recommend that a
"Zinc fish" be hung over the side in the water on a heavy wire
with a clip at the other end of this wire attached to your vessel's
electrical bonding system
60