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 Catalina/Capri 25/250 Sailor's Forums
 General Sailing Forum
 Sacrificial Anode: Zinc or Aluminum		  New Topic  Topic Locked
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Ben
Master Marine Consultant

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USA
1234 Posts
Initially Posted - 04/09/2013 :  12:54:18  Show Profile
Hi all,

I just bought two new sacrificial anodes for my new to me boat, and then I learned there are two kinds depending on salt or fresh water. Zinc is for salt, and Aluminum is for fresh. Can anyone corroborate this? When I ordered the anodes I didn't know there were the two kinds, but I wish the guy had asked if it was going to be in salt or fresh water. When I called him to find out which kind he sold me, he indicated that the zinc vs. aluminum thing was a gray area, but that he did indeed sell me the zinc, whereas I think now that I need aluminum. Incidentally, this is for my Autoprop.

thanks so much for any insight! :)
Ben
Beneteau 361
Viking Kitty
Columbus, Ohio
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delliottg
Former Mainsheet C250 Tech Editor

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USA
4479 Posts
Response Posted - 04/09/2013 :  13:27:21  Show Profile  Visit delliottg's Homepage
[url="http://www.performancemetals.com/anodes/AnodeFAQs.shtml"]This article[/url] looks like it should answer your question. It looks like you can use aluminum in any environment with some caveats, but not so zinc or magnesium.
Edited by - delliottg on 04/09/2013 13:28:23
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JohnP
Master Marine Consultant

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1520 Posts
Response Posted - 04/10/2013 :  05:55:50  Show Profile
My sailing venue is in brackish water about 100 miles upstream from the Atlantic Ocean, and I now plan to replace my zinc sacrificial anode with aluminum alloy.

I also wonder what my Honda owner's manual says about this.

These sailing adventures have morphed into life lessons about communications and legal responsibility, and practical lessons about fishing and crabbing, materials science, electrical repairs, woodworking, geography, meteorology, and force-vector physics, as well as fun on the water!

Incredible!
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Ben
Master Marine Consultant

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USA
1234 Posts
Response Posted - 04/10/2013 :  13:52:37  Show Profile
Thanks for the link, David. That's pretty much was I had read elsewhere too. I went ahead and ordered the aluminum version, and shipped back the zinc.
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delliottg
Former Mainsheet C250 Tech Editor

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USA
4479 Posts
Response Posted - 04/10/2013 :  14:52:08  Show Profile  Visit delliottg's Homepage
<blockquote id="quote"><font size="1" face="Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote"><i>Originally posted by JohnP</i>
<br />My sailing venue is in brackish water about 100 miles upstream from the Atlantic Ocean, and I now plan to replace my zinc sacrificial anode with aluminum alloy.

I also wonder what my Honda owner's manual says about this.

These sailing adventures have morphed into life lessons about communications and legal responsibility, and practical lessons about fishing and crabbing, materials science, electrical repairs, woodworking, geography, meteorology, and force-vector physics, as well as fun on the water!

Incredible!
<hr height="1" noshade id="quote"></font id="quote"></blockquote id="quote">

I know I've learned a lot from folks on this forum, and it's always fun to learn new things. I have to agree with you, I never really expected sailing to be a lot more than aiming a boat in the general direction you wanted to go, but there's a whole lot more to it.
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TakeFive
Master Marine Consultant

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2272 Posts
Response Posted - 04/10/2013 :  19:49:52  Show Profile
Is it true that much of the corrosion problem can be eliminated by pulling your outboard out of the water when not in use? I always thought that the anode issue was much more important for parts that are constantly submerged.
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Ben
Master Marine Consultant

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USA
1234 Posts
Response Posted - 04/11/2013 :  07:13:00  Show Profile
Rick, I'm sure you're right, and with my C25 it was not an issue. My question was in reference to my new boat, with a inboard deisel. :)
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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.