Originally Posted by
Polaris OBark
Ironically, if the CF crankarms were instead actual plastic, you would be safe from galvanic corrosion, since plastic is an insulator. Carbon Fiber, on the other hand, is a conductor, and has a redox potential. So you can still get galvanic corrosion with carbon fiber parts.
(Even if it was an insulator, I would still be afraid of CF crank-arms.)
Other than the inserts for pedals, BB spindle/chainring, the CF cranks that I've used - and continue to use - don't have sections bonded together, but are molded as one piece. IMO, crank arms are an excellent application for CF.