Shiver Metimbers
New member
I have a cast iron keel with a lead bulb (dissimilar metals) therefore should the keel be protected by bonding it to the hull anode?
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There is about 0.6 volts between lead and cast iron in the galvanic series in seawater, more than between cast iron/steel and zinc. A zinc anode might well do some good. Do you see any corrosion of the iron?
Would it harm to bolt an anode on the keel anyway as there is a tapped hole from where the previous owner had an anode?
There are some small rickety contours on the trailing edge of the keel, this could be corrosion or galvanic damage I'm not sure. But the previous owner has a bond between the bottom of one of the stantion bases to one of the keel bolts which I intend to remove.
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I wonder what is the object of the connection to the stanchion base.
The bond to the main Anode had corroded off at the point were the builder (Gibsea) had buried the bond into the gelcoat floor and the terminals of the anode could not be seen as they were buried too. Maybe the previous owner thought the bond from the stanchion base would be an alternative. Or maybe his idea of a lightning conductor?
I have drilled down into the anode stud and tapped it out so I can reattach the bond from the engine block and shaft stuffing box. Hence I'll be removing the bond to the keel bolt.