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 Catalina 25 Specific Forum
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cmckitrick
Navigator

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USA
119 Posts
Initially Posted - 05/06/2008 :  08:30:57  Show Profile
Someone told me yesterday that the boat should have a piece of sacrificial zinc to protect metal sea cocks. I have heard about this but thought it was more to protect parts of a motor like the prop. I believe there is one on my outboard but I always lift the motor out when I am on the mooring. I am not aware of one that is attached to the hull. Does anyone know otherwise and if there isnt one should I istall one? Thanks.
Charlie McKitrick
Norwell, MA
Valiant Lady... for now
'81 C 25 SR/FK
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ClamBeach
Master Marine Consultant

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3072 Posts
Response Posted - 05/06/2008 :  08:45:11  Show Profile
Need one? Depends on how 'hot' your venue is. Some areas eat metal, others are pretty neutral.

In order to protect metal underwater, the different parts need to be bonded (connected) to the zinc. Without am electrical connection between the parts and the sacrifical zinc, the zinc doesn't do much good.
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Dave5041
Former Mainsheet Editor

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USA
3758 Posts
Response Posted - 05/06/2008 :  16:50:43  Show Profile
Hence various specialty plastics seacocks.
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Voyager
Master Marine Consultant

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USA
5418 Posts
Response Posted - 05/06/2008 :  20:58:57  Show Profile
I'm in a big marina with lots of big power and sail boats with power this and power that, and I am sure that there must be one or two boats inadvertently running 120VAC through the seawater (sometimes salt, sometimes fresh) due to incorrect grounding, etc.

I'm lucky because I'm on the Tee End of the dock, so there would not be much power running through my patch of water anyway.

Also, I have no shore power connection (I charge my battery with a 30 W solar panel) and have a big, honking pair of zincs on my engine J.I.C., but none on the keel (standard fixed keel).

The seacocks are plastic (near as I can tell), and I installed a small copper grounding point below water line for lightning abatement.

I did not experience any corrosion last year, and I'm hoping not to see any again this year.

Nonetheless, they say that rust never sleeps . . .
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Notice: The advice given on this site is based upon individual or quoted experience, yours may differ.
The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.