fstbttms

Anodes? We Don' Need No Stinkin' Anodes!

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Just now, longy said:

So just what are pics #2 & 3??

The shaft key.

 

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Hey @fstbttms, you’d probably know this. What do folks do for anodes if they move between fresh and saltwater? Like, marina is on a river but they regularly sail out to sea. 

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aluminium.

No zinc, it gets some sort of scale in fresh water and will become useless.

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7 hours ago, brucephenry said:

Hey @fstbttms, you’d probably know this. What do folks do for anodes if they move between fresh and saltwater? Like, marina is on a river but they regularly sail out to sea. 

If the marina is in brackish water, you can use aluminum anodes. But if it is straight freshwater, you need magnesium. None of the three anode materials (zinc, aluminum and magnesium) are suited for both salt and freshwater however. That said:

"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."

https://martyranodes.com/about-freshwater-anodes/

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2 hours ago, fstbttms said:

If the marina is in brackish water, you can use aluminum anodes. But if it is straight freshwater, you need magnesium. None of the three anode materials (zinc, aluminum and magnesium) are suited for both salt and freshwater however. That said:

"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."

https://martyranodes.com/about-freshwater-anodes/

I'm in freshwater and have always used magnesium anodes and collar. 

How would aluminum('catch all') anodes/collar work with protecting an aluminum sail drive from pitting(or would they)? Or would a sail drive user moving from fresh to salt water for any length of time just completely switch to zinc? What do sail drive users use for brackish water?

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14 minutes ago, fufkin said:

I'm in freshwater and have always used magnesium anodes and collar. 

How would aluminum('catch all') anodes/collar work with protecting an aluminum sail drive from pitting(or would they)? Or would a sail drive user moving from fresh to salt water for any length of time just completely switch to zinc? What do sail drive users use for brackish water?

The metal used in aluminum anodes is actually an alloy and is more active than the aluminum used in saildrive legs. It is the preferred anode material for saildrives in salt or brackish water.

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