anodes ??

[deputydawg]

Boat at cobbs in poole, used mainly in the bay, do I need aluminium or zinc anodes ???

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[Marsupial]

If you want to keep the aluminum bits of boat and stop them from corroding use a zinc anode, it will give up its electrons and waste away before the aluminum parts.

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[dickh]

In salt water use Zinc - in fresh water use Aluminium.

<hr width=100% size=1>dickh
I'd rather be sailing... /forums/images/icons/smile.gif

 

[Solitaire]

Do you keep it in the water all the time or do you put it on the rack at Cobbs?


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[BrendanS]

actually, aluminium is for brackish(estuary) water not fresh. In fresh water should use magnesium

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[SteveJ]

On the mercruiser drive there are a couple of different types of anode depending on the type of drive some of the drives have zinc and some of them have an aluminum type, speak with the marine engineer before fittin any as if it should have ali type the zinc will cause problems. magnesium is used in fresh water

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[BrendanS]

Wasn't sure about this till I did some research, It seems all mercruiser outdrives now come with aluminium anodes as standard. Mercruiser changed specs a few years ago.

They've kept that pretty quiet!!!!!

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[ColinW]

Electrons come off a cathode, metal ions come off an anode!
I was always under the impression that the sacrificial anode isn't there to protect the aluminium parts of your engine, it's there to protect the unpainted steel parts like nuts, bolts and fancy stainless steel add-ons. The aluminium parts of your engine should be protected by paint.


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[KevB]

I'm in Chichester marina which has brackish water due to water from the local fields being pumped into the marina. If I was to try both zinc and aluminium anodes at the same time, could I deduce which one was best simply by seeing which one wears out the quickest?

Kevin.

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[waterboy]

Should a sea-going boat crossing France via the canal system have a lift-out and change to Magnesium anodes on entering the system and then visa versa on reaching the sea at the other end?

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[BrendanS]

Not a good idea to mix anodes I suspect.

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