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Electrolysis on Prop (Significant) #18224
05/16/19 02:52 PM
05/16/19 02:52 PM
Joined: Jul 2004
Posts: 851
New Orleans, LA, USA
David Erwin Offline OP
J/30 Class Co-President
David Erwin  Offline OP
J/30 Class Co-President
Joined: Jul 2004
Posts: 851
New Orleans, LA, USA
Our J/30 is showing signs of significant electrolysis on the Prop.

Our diver suggests a potential bad ground to engine.

We do not have any power in harbor since Hurricane Katrina.

Any ideas or recommendations?

Dave

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Re: Electrolysis on Prop (Significant) [Re: David Erwin] #18225
05/16/19 04:56 PM
05/16/19 04:56 PM
Joined: Sep 2000
Posts: 392
Rockwood, MI, USA
Russ Atkinson Offline
Senior Member
Russ Atkinson  Offline
Senior Member
Joined: Sep 2000
Posts: 392
Rockwood, MI, USA
We have gone to using a magnesium sacrificial instead of zinc. We are in fresh water so not sure how long it would hold up in brackish water as magnesium is not recommended for salt water

Re: Electrolysis on Prop (Significant) [Re: Russ Atkinson] #18241
05/28/19 11:22 PM
05/28/19 11:22 PM
Joined: Jul 2004
Posts: 851
New Orleans, LA, USA
David Erwin Offline OP
J/30 Class Co-President
David Erwin  Offline OP
J/30 Class Co-President
Joined: Jul 2004
Posts: 851
New Orleans, LA, USA
Russ, This was the magic. Typically we are in brackish water as such zinc is best. Since the flooding has started the river water is now flowing through the lake causing a fresh water environment. I found this document to be very useful:

http://j30.us/images/WhichAnodeMaterial.pdf

Re: Electrolysis on Prop (Significant) [Re: David Erwin] #18242
05/30/19 11:40 AM
05/30/19 11:40 AM
Joined: Sep 2000
Posts: 392
Rockwood, MI, USA
Russ Atkinson Offline
Senior Member
Russ Atkinson  Offline
Senior Member
Joined: Sep 2000
Posts: 392
Rockwood, MI, USA
Glad it worked Dave. Check it often, mine barely makes it through a year in pure fresh water


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