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Hydrofoil Fuselage Corrosion and a Sacrificial Anode

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Hydrofoil Fuselage Corrosion and a Sacrificial Anode

Postby zsteve » Sat Aug 24, 2019 5:37 pm

I have a new Moses hydrofoil that gets very fine pitting on the aluminum fuselage.
A previous Moses foil fuselage I had had severe corrosion near the screws and near the mast slot, but strangely not on the nose or tail end even though the aluminum seemed more exposed with the anodizing color worn off.
I've taken to freshwater rinses after each session and rubbing off any oxidation(?) I see, but I'm considering something like the sacrificial anode that Alpine uses with maybe a small zinc washer somehow contacting one of the stainless steel screws.
I'm aware that there products like Teff Gel, but I'm leaning towards a more simple, lasting solution that requires less maintenance.
Can anyone offer any suggestions or insight on the effectiveness, conductivity or surface area necessary if I use this approach?

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Re: Hydrofoil Fuselage Corrosion and a Sacrificial Anode

Postby AndersP » Sat Aug 24, 2019 8:04 pm

Tefgel or Ptfe-gel on your screws every 2-3 week takes about a minute or two
To me that is not such hard work. I have no problem with corrosion. Foiling 3-4 times a week in saltwater with no other maintenance.

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Re: Hydrofoil Fuselage Corrosion and a Sacrificial Anode

Postby airsail » Sat Aug 24, 2019 9:31 pm

Tefgel will solve you galvanic corrosion problem between your screws and alloy parts but not the areas you are talking about. I just use marine grease, cover all the joins where rinsing after use doesn’t get to. Disassemble every two weeks, quick rinse, regrease then assemble. Never had a corrosion problem. The grease insulates the alloy from any carbon parts.

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Re: Hydrofoil Fuselage Corrosion and a Sacrificial Anode

Postby plummet » Sat Aug 24, 2019 11:04 pm

I agree with the above, Use Tufgel or similar and marine grease for faces etc.

Long term look at getting a set up that does not use dissimilar metals and the problem will go away forever.

For more detailed info on corrosion look at this thread

viewtopic.php?f=1&t=2403406&p=1061096&h ... n#p1061096

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Re: Hydrofoil Fuselage Corrosion and a Sacrificial Anode

Postby Windigo1 » Sun Aug 25, 2019 1:37 pm

The anode would work it's been used on boats for a long time. However you would need a nice spot to bolt it on like they did on this Alpine foil otherwise you will have a lot of extra drag.

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Re: Hydrofoil Fuselage Corrosion and a Sacrificial Anode

Postby Herman » Sun Aug 25, 2019 3:17 pm

I have a vague recollection of an aluminium racing yacht that, when moored, deployed a set of sacrificial anodes and then ensured the potentials were as desired electronically. This suggests to me that the effect of a strategically placed zinc washer could,at least theoretically, be measured with the foil immersed in its electrolyte, ie. sea water, by a sensitive volt meter. Practically it may be difficult to make good enough contact with foil due to paint, laquer, anodised layer etc to take meaningful measurements.

I realise this may not be directly helpful, I just mention it for interest!

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