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189212 RCD-2
Index C
8.5 PROTECTION AGAINST ELECTROLYSIS / EARTH PLATE
8.5.1 Anodes
General points
- The sacrificial anode protects the submerged elements of the boat against electrolysis.
- A sacrificial anode is a consumable part that protects submerged metal parts by its
dissolution (oxidation). The anodes used are made of a metal that is more readily reductive
than the metal they are protecting.
- On a new boat, all the underwater metallic components try to be at the same electric
potential, which leads to the rapid deterioration of the anodes in the first few weeks in the water.
- You can put several anodes on the hull.
Maintenance
- At least 2 times a year, check the corrosion on all of the anodes. Change the anode if
necessary (Before it lost 50% of its weight).
- Use the appropriate anodes for the cruising area: fresh water/magnesium anodes; Sea
water/zinc anodes.
- If the motor mountings are raised, the anodes are out of the water: in this case the anodes
can no longer protect the sterndrive: take note of the skipper's recommendations.
- When the boat is kept in a dry dock, a light deposit of dust will settle on the anodes: Before
returning the boat into the water, clean the anodes.
Cleaning anodes
- Use sandpaper. Do not use metal brushes or steel tools to clean the boat, it may damage
the galvanic protection.