Galvanic corrosion: How big of a problem

I’m wondering if having carbon parts for my motorcycle that if I have the carbon in contact with a aluminum mount point how big of a problem it would be?

The bike also has some magnesium components along with aluminum. Just wondering if I could sacrificially destroy some of the Mg components by having carbon in contact and how long or what the outcome would look like?

If everything is kept dry, problems are not big. However, you will get it wet some day.

Isolate the carbon from metal parts, by using plastic washers, or laying up a piece of glass fabric.

laying up glass on the surface (as mentioned) is a usual solution and Works well.

For bolts and fittings, the usual comercial solutions for aluminium construction, isolated bolts and rivets, etc … just avoiding electrical contact…

Herman, Since it will be a motorcycle component I imagine that it will see some water/moisture down the road… Glass sounds like the solution to the problem.

Zorongo, I’m thinking of making a subframe for a motorcycle (the part that the rider sits on and is covered by the tail plastic). The frame as a whole is what the electrical system is grounded to(I will not ground to the carbon subframe). Is that a problem with regard to the avoid electrical contact?

Hi (I love enduro bikes !!) (I think Husaberg was using plastic (thermoplastic) for their subframes)

If I understand correct, you are doing the ground into the metal chasis. Not into the carbón.
If so, there is no problem. Just isulate the carbón from the aluminium. Use plastic washers, foam tapes, or even plastic bushes if one screw passes both carbón and aluminum (usual solution on aluminium + Steel boats)
Carbon is weak for the abrasión, and “soft” foams and washers will help to avoid breaks on the carbón.

Enjoy it !

thanks zorongo!

You can also use isolating compounds like lanocote or duralac.