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Go Back   SailNet Community > On Board > Gear & Maintenance
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  #1  
Old 08-08-2007
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Galvanic corrorsion?

Hi,
I am the new owner of an old Endeavour (1983) 33. It is in the same slip where I used top keep a SeaRay 33. The Searay had a galvanic corrosion problem and the outdrives had to be replaced. I am told there is "stray current" where I am at.

The sailboat went into the water end of June. I am thinking of keeping it in the water this winter.


I have 2 huge fish I used to throw overboard for the SeaRay. Should I throw these overboard for the sailboat and clip the wire onto the stainless steel rigging? Will that be beneficial?

Clueless but learning from sailnet,
SaltyPat
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Old 08-08-2007
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Whatever you do I don't think that clipping to the rigging is a good idea given stainless steel's extremely poor conductivity.
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Old 08-08-2007
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Just put on a big honkin' shaft zinc or two on your prop shaft.
The fish only work if what they are connected to is grounded...not always true with shrouds.
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Old 08-08-2007
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If you want to use the fish, run a heavy cable from the boat's DC ground and attach them to it.
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Old 08-08-2007
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A zinc will only protect what it is in electrical contact with. If there is a direct electrical path from your prop shaft to your rigging, a fish zinc will provide protection. If not, you're wasting your time and money.

Since you know there are corrosion issues in your slip (or aboard your boat, which is much more likely) your best bet is to have a diver putting eyes on your running gear periodically.
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