13 Ways to Prevent Galvanic Corrosion
1. Don’t mix metals, or at least use metals as close to each other as possible in the galvanic series.
2. Bolts should be less active than fittings; they’re small, so loss of metal is more serious.
3. Take all measures to electrically isolate fittings from each other, even on small craft.
4. Securely fasten anodes, and ensure there is firm contact with the metal to be protected.
5. Never paint an anode. Be sure the metal to which it is fastened is free of paint, scale and dirt.
6. Impressed current voltage should never exceed 1,300 millivolts when protecting aluminum.
7. Always repair paint chips and scratches that expose bare metal as soon as possible.
8. Avoid using any lubricant made with graphite aboard a boat made from aluminum.
9. Employ an isolation transformer whenever the boat’s connected to AC shore power.
10. Don’t use an automotive battery charger aboard a boat, especially an aluminum boat.
11. Paint only with primers and coatings specifically designed for aluminum.
12. Wash the boat down after every use with fresh water to remove built-up salts.
13. Keep hooks, sinkers, bottle caps and other metal debris out of the bilge lest they wreak havoc.