Galvanic corrosion on carbon fiber yachts

Mr LGM · May 20, 2021

Hi there,

I would like to find out if there are any preventative measures for galvanic corrosion on carbon fiber vessels. More specifically, it seems that carbon fiber, when in contact with aluminium for instance, could cause galvanic corrosion. A follow-up question would then be: Can carbon fiber cause stainless screws/bolts to corrode as well, assuming both materials are exposed to seawater?

Cheers

TugboatEng · May 20, 2021

Crevice corrosion will be a larger problem as it's already an issue in non-conductive substrates such as fiberglass.

https://www.google.com/url?sa=t&sou...Vaw3NqjIGqeBBgQmOTaMfh1Oh&cshid=1621520239553

This one is probably a bit more accurate:

https://store.nace.org/marine-crevi...alloys-under-biofilmed-and-sterile-conditions

Mr LGM · May 20, 2021

Thanks

EdStainless · May 20, 2021

Use Ti with C fiber like they do in aerospace.
Coupled to Al is a guaranteed disaster, and common SS alloys will not stand a chance either.
The only real options to mate with CF in wet environments are high alloy SS (6% Mo superaustenitic or superduplex) or Ti alloys.

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P.E. Metallurgy, consulting work welcomed

Compositepro · May 20, 2021

Carbon fiber must not contact most metals in wet environments. Insulating washers and bushings will work.

Mr LGM · May 21, 2021

Thanks, I appreciate the feedback

TugboatEng · May 21, 2021

I use Teadit 24BB gasket tape between any flanged connections of similar or dissimilar materials on my boats.

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Galvanic corrosion on carbon fiber yachts

Mr LGM

Marine/Ocean

TugboatEng

Marine/Ocean

Mr LGM

Marine/Ocean

EdStainless

Materials

Compositepro

Chemical

Mr LGM

Marine/Ocean

TugboatEng

Marine/Ocean

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