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Old 04-10-2015, 07:47   #16
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Re: Zinc, Anodes, & Electrolysis….Huh? :)

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Originally Posted by Dave Lochner View Post
Another good source of information and anodes is
BoatZincs.com Frequently Asked Questions

Also, consider using Aluminum anodes instead of zincs. Aluminum will work in fresh, brackish, and saltwater and is somewhat more environmentally friendly than zinc according to a recent article in Professional Boatbuilder.
Read the same article in PB, and they give a fairly decent argument for aluminum use in freshwater... Going against convention and known performance is a tough road when putting yours or someone else's running gear on the betting line...
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Old 04-10-2015, 07:47   #17
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Re: Zinc, Anodes, & Electrolysis….Huh? :)

No, because the zinc and magnesium would eat each other up.

If you sail in both fresh and saltwater, use aluminum. Aluminum will work as well or better than zinc in saltwater and will work in freshwater, although a little less well than magnesium.

Found this company that has a decent explanation of the need for anode protection and the various types of anodes.

Anode FAQs
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Old 04-10-2015, 07:52   #18
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Re: Zinc, Anodes, & Electrolysis….Huh? :)

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Originally Posted by HappyMdRSailor View Post
Read the same article in PB, and they give a fairly decent argument for aluminum use in freshwater... Going against convention and known performance is a tough road when putting yours or someone else's running gear on the betting line...
Maybe that's why too many freshwater boaters still use zincs, because, well you always put zincs on your prop shaft, right?

A while back the local West Marine store, well inland in New York, only sold zinc anodes, no magnesium or aluminum. The nearest salt water is several hundred miles away. Go Figure.
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Old 04-10-2015, 07:54   #19
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Re: Zinc, Anodes, & Electrolysis….Huh? :)

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Originally Posted by Trident50 View Post
Again, tons of information on this, but I can't find any in "English", it all seems to be written in "Engineer", so if anyone has a good link to share, or if this is not as complicated as it seems to be to me and it can be explained here - as if I were a not so bright 5 year old? - I would appreciate any guidance!

Thank you all and be well!
Rob
High School chemistry, man.

Zincs, cleaning compounds, fuel additives, tank odors.... It was all there, but we assumed we would never use it....
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Old 04-10-2015, 08:03   #20
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Re: Zinc, Anodes, & Electrolysis….Huh? :)

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Originally Posted by Dave Lochner View Post
Maybe that's why too many freshwater boaters still use zincs, because, well you always put zincs on your prop shaft, right?

A while back the local West Marine store, well inland in New York, only sold zinc anodes, no magnesium or aluminum. The nearest salt water is several hundred miles away. Go Figure.
That's funny. Same with the Wes Marine in Washington DC; they had not heard of aluminum.

Regarding Al vs. Zn, even in salt and brackish, it is not just about the environment. Aluminum is different (more electron capacity, better protection, not as easily inhibited by carbonate, attracts more marine growth), and which is functionally better is still up in the air. I've got about 25 corrosion samples soaking right now, ocean and Chesapeake.

I will say that all of the serious damage in the Chesapeake is due to factors other than aluminum or zinc (no anode, wiring faults, etc.).
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Old 04-10-2015, 08:07   #21
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Re: Zinc, Anodes, & Electrolysis….Huh? :)

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High School chemistry, man.

Zincs, cleaning compounds, fuel additives, tank odors.... It was all there, but we assumed we would never use it....
I know right????

daaaaang... If I'd only paid more attention in HS chem.... I'd be cruising right now.... on an 80' swan...
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Old 04-10-2015, 08:12   #22
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Re: Zinc, Anodes, & Electrolysis….Huh? :)

one of the arguments for Al is...

I've owned a shiznit ton of IO ski boats with Al outdrives.... (stinkpotter saildrive) meant for lakes obviously.... All as far as I can remember, all protected with an Al anode ... on Al...
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