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Zinc or aluminum anodes for salt water?

Old 04-01-2020, 04:37 PM
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Default Zinc or aluminum anodes for salt water?

I've always thought zinc was the way to go in salt water but maybe I have been wrong this whole time.......
Old 04-01-2020, 04:53 PM
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I think so. You and many.
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Old 04-01-2020, 05:00 PM
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Read these charts and see where you fit in.

Chart%20A.pdf
Chart%20B.pdf
Old 04-01-2020, 05:31 PM
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I use aluminum because I mostly boat in brackish with occasional saltwater use. It is the best all around anode material for the two.
Old 04-01-2020, 05:40 PM
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Originally Posted by Sceptre2375 View Post
I've always thought zinc was the way to go in salt water but maybe I have been wrong this whole time.......
what boat/engine?

boatzincs has a chart

ps. brackish many times is really saltwater (high salt content)
Old 04-01-2020, 05:40 PM
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The anodes on my yamahas are aluminum.
Old 04-01-2020, 05:47 PM
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..and make sure that all anodes are made of the same material
Old 04-01-2020, 06:56 PM
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1975 SeaCraft Sceptre- mercruiser 350 MAG MPI with an alpha 1 gen 2 outdrive and a stainless prop. Also- I have a “Mercathode” system. Would that dictate aluminum or zinc? She is kept dockside on a salt water river on cape cod.
Old 04-01-2020, 08:42 PM
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Is aluminum what comes stock on yamaha 4.2l motors?
Old 04-01-2020, 10:48 PM
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Originally Posted by Sceptre2375 View Post
1975 SeaCraft Sceptre- mercruiser 350 MAG MPI with an alpha 1 gen 2 outdrive and a stainless prop. Also- I have a “Mercathode” system. Would that dictate aluminum or zinc? She is kept dockside on a salt water river on cape cod.
probably zinc but check the manual and boatzincs.com
Old 04-02-2020, 04:17 AM
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Originally Posted by Low Bidder View Post
Is aluminum what comes stock on yamaha 4.2l motors?
Yup
Old 04-02-2020, 06:14 AM
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Originally Posted by Low Bidder View Post
Is aluminum what comes stock on Yamaha 4.2l motors?
yes, although Yamaha OEM anodes are a proprietary blend -
noticeably more 'active' than aftermarket Mil-A-24779 Aluminum

here are 4 anodes that were in simultaneous service in the same block:

3 are Martyr brand 'aluminum', the one far right is OEM Yamaha

Name:  used-anodes.png
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