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Anodes
Nov 23, 2019 16:37:12 GMT
Post by Maravilla on Nov 23, 2019 16:37:12 GMT
We are adding a large aluminum arch for solar and wind. Thoughts: tie it to the current sacrificial anodes on the sail drive? Add a new anode tied only to the arch? For those who frequent the Caribbean, does the stock anode system (sail drive) suffice? Thanks!!
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Anodes
Nov 24, 2019 9:15:49 GMT
Post by panoramix on Nov 24, 2019 9:15:49 GMT
If the arch is above the waterline, then there is no need for an anode. Electrolysis is only possible when the arch is immersed in an electrolyte (seawater).
On the points where the arch is mounted to stainless steel, you should add nylon spacers to avoid corrosion on these spots.
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Anodes
Dec 2, 2019 11:14:15 GMT
Post by saltymetals on Dec 2, 2019 11:14:15 GMT
for belt and braces approach i would also use Duralac on the bolts and joints, in addition to nylon spacers. Andrew
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Anodes
Dec 2, 2019 22:30:58 GMT
Post by rene460 on Dec 2, 2019 22:30:58 GMT
Not belt and braces really, just the necessary precaution of insulating every contact point between the stainless steel and aluminium. Otherwise the aluminium will do an excellent job of sacrificially protecting the stainless steel when it gets wet due to rain or spray.
But the issue is just corrosion at that localised point, there is no need to connect it to other parts of the boat underwater system.
Often the arch is made of stainless steel so the issue is avoided. However, aluminium is much lighter, so providing it is designed to be strong enough, it should be ok. It just means you have to pay attention to insulating all points of contact. Just as all the stainless steel fittings on an aluminium mast have to be insulated. Otherwise, what goes on behind the fittings has to be seen to be believed.
rene460
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