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Old 02-07-2015, 01:59 PM   #1
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Aluminum Anodes

Google "aluminum anodes," read articles that show up, including stuff by experts like Steve D'Antonio. Why aren't we all using aluminum anodes? Caution: when changing them out, change all the ones in the same bonding system.
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Old 02-07-2015, 02:22 PM   #2
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Good question. Cost maybe?
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Old 02-07-2015, 03:16 PM   #3
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It shouldn't be cost. We changed to Al and the cost was within $20 for the 3 anodes on Hobo and they last longer. Right now were in brackish water but we'll stay with Al and monitor when we go back to salt. Here's a source and a brief discussion. Scroll down to question T7 and open the two PDF tables. BoatZincs.com Frequently Asked Questions
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Old 02-07-2015, 04:05 PM   #4
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They cost about the same. An interesting disadvantage from someone who said they didn't think they last as long as zinc. That may be because when the zinc gets into fresh or brackish water it developes some coating which makes them ineffective, so they might last forever. So would a piece of plastic, but it may not protect the boat. I can't see any reason to have zinc anodes at all. (Supposedly the ones in the engine and genes are in a different "lake," bonding wise, and don't need to be changed at the same time as the others.
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Old 02-09-2015, 12:07 PM   #5
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Sitting in fresh water I know aluminum is the preferred material for anodes on my shaft and rudders... In fact, I just replaced them this month... (though the discussion on not lasting as long could also be a result of sitting in a "hot" marina with lots of stray charge around you eating them away faster)

but does the same go for the engine and generator anodes? Aluminum there too?

Coming up time to inspect and replace, so got to thinking about it.
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Old 02-10-2015, 03:13 PM   #6
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I put aluminum anodes on my boat last year but haven't hauled again and don't know what shape they are in. Problem is finding aluminum shaft anodes. Haven't found any yet.
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Old 02-12-2015, 10:47 AM   #7
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Sitting in fresh water I know aluminum is the preferred material for anodes on my shaft and rudders...
Nope.

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Old 02-12-2015, 01:37 PM   #8
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hmmm, and yet nobody in this area recommends Mg.
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Old 02-12-2015, 02:11 PM   #9
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I'm not sure the Al vs Mg in fresh water is a yes/no or will/won't work type of answer. Mg is probably the best for fresh but quality Al will work from what I can tell. There are a lot of opinions out there and here are a couple.

This is from Performance Metals web site.

Anode FAQs

and this is from Martyr's web site. http://www.martyranodes.com/content/...anodes/Mag.php

The common anode for fresh water is magnesium. Aluminum is a good "catch all" anode meaning a boat that frequents both fresh and salt has decent protection in either environment. The quality of the anode and the purity of the aluminum or magnesium is also important. On this topic, experience (water type, boat location) is your best reference.
John Adey | Technical Director | ABYC Master Technician
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Old 02-12-2015, 02:13 PM   #10
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Interesting, considering the graphic I posted is also from the Martyr web site.
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Old 02-12-2015, 03:59 PM   #11
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Quote:
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I put aluminum anodes on my boat last year but haven't hauled again and don't know what shape they are in. Problem is finding aluminum shaft anodes. Haven't found any yet.
Try zincwarehouse.com.
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Old 02-12-2015, 04:03 PM   #12
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Try zincwarehouse.com.
BoatZincs.com (978-841-9978) – The Online Superstore for Zinc Anodes
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Old 02-14-2015, 04:08 PM   #13
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Engine anodes are available in Aluminum, but don't have to be replaced at the same time, as they are in a different "lake."
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Old 02-14-2015, 04:33 PM   #14
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Engine anodes are available in Aluminum, but don't have to be replaced at the same time, as they are in a different "lake."
Do you have a source for the engine pencil anodes in Al? I can only find Mg or Zn.
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Old 02-15-2015, 11:00 AM   #15
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Performance metal. they also have a tech bulletin about why we should all be using them.
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Old 02-15-2015, 11:18 AM   #16
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Thanks
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Old 02-15-2015, 11:50 AM   #17
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Just replaced all my anodes with Performance Metal Anodes including the hull and prop shaft. I purchased them through Go2Marine. It will be interesting to sea how they hold up. The boat will be in freashwater.
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Old 02-27-2015, 05:09 PM   #18
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Do you have a source for the engine pencil anodes in Al?...
Quote:
Originally Posted by jjanacek View Post
Performance metal...
The heat exchanger anode was the last for all Aluminum. Thanks jjanacek.

I do like that there is a central core. They advertise that it prevents the end from breaking off. Historically when I change the heat exchanger zinc, I find pieces on the face. We'll see.

Below is the zinc with the brass head and the Al with the SS head. Less than $5 each.
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Old 02-27-2015, 07:20 PM   #19
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Probably a stupid question, however...

Is using Al anodes for the heat exchangers/oil coolers but zinc for shaft etc anodes ok or should all anodes on the boat be the same material?

I ask because I've just fitted a fresh water flush system and only just found out the zinc anodes won't work in the exchangers once fresh water is in there.
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Old 02-27-2015, 09:56 PM   #20
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Should be okay to use different anodes; they wouldn't be working to protect the same metals. I can't see the problem of mixing them on the same metal either, the zinc and Al would be eaten away at different rates, but both would still be protecting the SS or bronze until they are used up.
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