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  #1  
Old 05-07-2012
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Lead Keels

I have a bolted on lead keel. What keeps the lead from disapearing due to galvanic corrosion? Seeing lead is very low on the galvanic chart, seems it would sacravice itself rapidly and disapear.

How should you bottom paint a lead keel. Should there be a primer to the bare lead, then bottom paint?

I notice I get a lot of hard growth (several inches thick in say about 4 months time, rest of hull is in great shape) only at the very bottom of my lead keel (even though I bottom painted it), need to use a metal scraper to get it off. Why does it seem the hard growth occurs under the keel only?

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Old 05-09-2012
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Re: Lead Keels

I don't know the chemistry but lead lasts forever. Literally thousands of years. Paint right over it with your bottom paint. Growth on the bottom of the keel might be caused by srcaping the paint off if you sail in shallow water. Or maybe old damage created a rough surface that growth can stick to.
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Old 05-09-2012
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Re: Lead Keels

Lead will galvanize. Most if not all lead keels are fiberglass or epoxy encapsulated to prevent exposure to water. Whenever I've had an exposed bit of lead that I've bottom painted, it's the first area to show growth and pitting.

When we stripped the paint from the hull a few years ago, I sanded all the bottom paint from the led keel and then put several coats of Interlux PrimoCon on it to isolate the keel. Works great and I have no longer have pitting.
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Old 05-09-2012
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Re: Lead Keels

Quote:
Originally Posted by WanderingStar View Post
I don't know the chemistry but lead lasts forever. Literally thousands of years. Paint right over it with your bottom paint. Growth on the bottom of the keel might be caused by srcaping the paint off if you sail in shallow water. Or maybe old damage created a rough surface that growth can stick to.
The growth does seem to like the rough area, and the bottom of the keel, seeing that is where it is supported when on the hard, does not get prepared well prior to bottom painting.
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Old 05-09-2012
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Re: Lead Keels

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Originally Posted by Sabreman View Post
Lead will galvanize. Most if not all lead keels are fiberglass or epoxy encapsulated to prevent exposure to water. Whenever I've had an exposed bit of lead that I've bottom painted, it's the first area to show growth and pitting.

When we stripped the paint from the hull a few years ago, I sanded all the bottom paint from the led keel and then put several coats of Interlux PrimoCon on it to isolate the keel. Works great and I have no longer have pitting.
Thanks for suggestion, I will try at next haul out.
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Old 05-09-2012
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Re: Lead Keels

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Originally Posted by Sabreman View Post
Most if not all lead keels are fiberglass or epoxy encapsulated to prevent exposure to water.

My experience differs - I've rarely seen a lead keel glassed over. Lead is so close to inert there is really no reason to do it.
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Old 05-09-2012
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Re: Lead Keels

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Originally Posted by ruparthomes View Post
it would sacravice itself rapidly and disapear.
What are you refering to, what would disapear the lead or a zinc attached to the lead?
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Old 05-09-2012
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Re: Lead Keels

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Originally Posted by Sabreman View Post
Most if not all lead keels are fiberglass or epoxy encapsulated to prevent exposure to water.
What marinia have you been walking around it?

For the most part lead keels don't have galvanic corrosion as there isn't some other type of metal attached to in that is also in the water.
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Old 05-09-2012
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Lead Keels

Copper is more than 10 times more conductive than lead. That may have something to do with it. A guess.

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Old 05-09-2012
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Re: Lead Keels

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Originally Posted by Don0190 View Post
What marinia have you been walking around it?

For the most part lead keels don't have galvanic corrosion as there isn't some other type of metal attached to in that is also in the water.
I think that is why one does not want to paint a copper bottom coat directly to the copper as it will set up a battery effect. A barrier (epoxy) applied to the bare lead is needed.
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