I can honestly say that carbon in contact with metals can be quite reactive, as I know that carbon and SS often evidences iron ferrites in the mix, and significant corrosion can be an outcome. Aluminum could pose similar limitations in combination with carbon. Yet I have to say aluminum, at least in my opinion, can be death on most windsurfing gear, with a possible exception for maybe mast base extensions.
Would I ever buy an aluminum boom? Never!