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Originally Posted by Wayne25
Fstbttms:
I'm glad you replyed. Hopefully you have cleaned a number of hulls with iron cenrtboards like mine. Do you recall if most of them had zincs bolted to them.
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I have seen a few swing-keel boats use zincs on the keel, don't believe I've I seen any centerboarders that do. I wouldn't recommend it in any case, for two reasons:
1.- The centerboard is likely isolated from the onboard electrical system and therefore not at much risk of electrolytic corrosion. The same applies to any risk of galvanic corrosion. The centerboard has little (if any) connection to a dissimilar metal.
2.- Adequate protection of the relatively large amount of metal in your centerboard would require a whole bunch of zinc, more than you could conveniently attach. The zinc anodes commonly used to protect props, shafts and other running gear are probably inadequate for the job.
My recommendation would be to not lose any sleep over the centerboard but when you have the boat cleaned or hauled, inspect it. Attach anodes only if there is an obvious problem with corrosion. If it ain't broke, don't fix it.