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23-07-2016, 11:10
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#16
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Registered User
Join Date: Oct 2007
Location: virginia
Boat: islandpacket
Posts: 1,967
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Re: Any DIY portable anodes to prevent galvanic corrosion?
Hook it to your prop shaft
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__________________
That derelict boat was another dream for somebody else, don't let it be your nightmare and a waste of your life.
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23-07-2016, 11:13
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#17
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Hull Diver

Join Date: Oct 2006
Location: Under a boat, in a marina, in the San Francisco Bay
Posts: 5,483
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Re: Any DIY portable anodes to prevent galvanic corrosion?
Quote:
Originally Posted by Badsanta
Hook it to your prop shaft
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He doesn't have a prop shaft.
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25-07-2016, 09:29
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#18
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Registered User
Join Date: Aug 2014
Location: Astoria, NY
Boat: Sabre 38
Posts: 566
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Re: Any DIY portable anodes to prevent galvanic corrosion?
Quote:
Originally Posted by fstbttms
In all likelihood, the problem is aboard your boat, not the neighbor's. You need to have an electrician find (and fix) the problem rather than looking for a band aide or pointing fingers.
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Entirely possible, I admit. I did some testing around and didn't see odd voltage/current readings that would indicate a short/bad ground, but I also learned my equipment isn't up to snuff.
Just placed an order for this jazzy addition that will hopefully help me pinpoint the issue (and blame).
Corrosion Reference Electrode Product Specifications
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Stephen
s/v Carpe Ventum
1983 Sabre 38
My Intro
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25-07-2016, 09:57
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#19
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Moderator Emeritus

Join Date: Oct 2013
Location: Jacksonville/ out cruising
Boat: Island Packet 38
Posts: 31,348
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Re: Any DIY portable anodes to prevent galvanic corrosion?
I hang a "Guppy" anode often, but it's purpose is a as a witness, if it ever starts getting eaten up, then I know something is going on and I need to investigate, it is not to replace a prop of shaft anode, I have both, if anything I may be a little over zinced.
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25-07-2016, 10:43
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#20
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Registered User
Join Date: May 2014
Location: USA
Boat: 41' yawl
Posts: 1,223
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Re: Any DIY portable anodes to prevent galvanic corrosion?
Quote:
Originally Posted by a64pilot
I hang a "Guppy" anode often, but it's purpose is a as a witness, if it ever starts getting eaten up, then I know something is going on and I need to investigate, it is not to replace a prop of shaft anode, I have both, if anything I may be a little over zinced.
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Not possible to "over zinc" because the voltage present is a function of the relative nobility of the materials present and maybe the details of the electrolyte solution they are in.
Except under limiting conditions (*under* zinc'd), the quantity of zinc will not impact the voltage present. So the current will not be affected. So the corrosion will not be affected.
At least that's how I understand it.
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25-07-2016, 10:55
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#21
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Hull Diver

Join Date: Oct 2006
Location: Under a boat, in a marina, in the San Francisco Bay
Posts: 5,483
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Re: Any DIY portable anodes to prevent galvanic corrosion?
Quote:
Originally Posted by chris95040
Not possible to "over zinc"...
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Fiberglass or metal boats, maybe not. Wood boats? Absolutely they can be over-zinc'd.
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25-07-2016, 12:11
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#22
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Registered User
Join Date: May 2014
Location: USA
Boat: 41' yawl
Posts: 1,223
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Re: Any DIY portable anodes to prevent galvanic corrosion?
Quote:
Originally Posted by fstbttms
Fiberglass or metal boats, maybe not. Wood boats? Absolutely they can be over-zinc'd.
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Ohhhhh right I've heard of that. Good point.
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21-04-2021, 18:11
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#23
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Registered User
Join Date: Aug 2012
Location: Langford BC Canada
Boat: Bavaria Cruiser 41
Posts: 1
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Re: Any DIY portable anodes to prevent galvanic corrosion?
https://www.anodeoutlet.co.uk/how-to...anging-anodes/
Its a thing.... And all your 'outside the hull' metal should be electrically connected.... you don't need to specifically connect this kind of thing straight to the drive. Neat idea if you are having trouble in a marina.
Then again if you are having that much trouble in a marina you should be asking the marina to investigate.... stray current is not good and potentially not just for the metal bits...
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