Pic of 1 year old aluminum anode - SailNet Community

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Old 02-24-2014
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Pic of 1 year old aluminum anode

Hi All,

I'm getting ready to start my second season on Lake Erie with my boat. This is the first time I've replaced the sacrificial aluminum anode that goes on my Autoprop. I thought I'd post a picture of it here and solicit comments. Not the most exciting picture, by any means, but I'm wondering if I could have taken a wire brush to this thing and gotten another year out of it. Other than some surface corrosion it's not much changed from when it was new.

Granted, in the large scheme of things it's an inexpensive piece of maintenance gear, but at more than $40 each from Autoprop it seems much more expensive than other sacrificial anodes, unless that's normal for aluminum anodes.

Thanks for looking!
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Old 02-24-2014
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Re: Pic of 1 year old aluminum anode

When mine look like that I replace them. I use zinc anodes so not sure how much better/worse it would be but that looks like mine after 6 months or so. I have been told I am in a "hot" marina but I think it's just my boat which is hot. If you got a year out of it I would call it good, alot less than replacing a pitted prop.

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Old 02-24-2014
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Re: Pic of 1 year old aluminum anode

20 bucks, buy 2 - Autoprop Propeller Zinc Anodes
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Old 02-24-2014
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Re: Pic of 1 year old aluminum anode

Aluminum anodes are not for freshwater use. However, try finding a magnesium Autoprop anode.

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Old 02-24-2014
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Re: Pic of 1 year old aluminum anode

Check with the local chandlers to see what anodes everyone else buys.
The salt content of Lake Eire may make aluminium fine.

If so your anode looks quite OK for another year.
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Old 02-25-2014
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Re: Pic of 1 year old aluminum anode

Thanks guys, I'll confirm, but for some reason I thought I had learned on SN last year that Aluminum was appropriate for Lake Erie. I'll continue my research. Thanks for the expertise.
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Old 02-25-2014
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Re: Pic of 1 year old aluminum anode

Okay, who to believe?

This one says Aluminum works in all applications (fresh, brackish, salt)
Anode FAQs

But this one says Aluminum only works in Salt and Brackish.
https://www.defender.com/html/zincs_info.html

And then again this one says Aluminum's only for Salt and Brackish.
Boat Michigan

I'll see what the other boaters in my area are doing, but it looks like I have $90+ worth of aluminum anodes to return.

Crimony.
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Old 02-25-2014
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Re: Pic of 1 year old aluminum anode

Ironically, when an anode isn't corroding very fast, I worry it isn't working.
davidpm and Group9 like this.
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Old 02-25-2014
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Re: Pic of 1 year old aluminum anode

I consider them cheap insurance.
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Re: Pic of 1 year old aluminum anode

The other thing is Lake Erie ain't as fresh as you might think! Especially near cities.

A magnesium anode might disappear in a week and just from the salt.
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