Don't know, I'm not that familiar with this really just from what I've read about it on the web so far as far as the dissimilar metals in jewelry. With oil in the pivot I suppose if you kept them oiled that may work, it could also work as an electrolyte itself if it were conductive though which is what you'd want to avoid.

The heat shrink sounds like a good idea, I ordered some small tube that I figured I'd use not sure what the friction will be like assembled yet though so I may have to try something different I do have some small heat shrink tubing from my RC cars, but that may be a little big maybe it'll work not sure it'll shrink down that far.

It may not really be a problem if they're properly cared for and not allowed to get wet and what-not but it could also end up being a problem. I'm not sure how much corrosion will really show up. The guys with CF scales may know as I think I saw some with brass spacers, if the CF didn't have a clear coat or something on it it would be like graphite being in contact with the brass which should cause corrosion to the brass at the joint. If it were coated with something to prevent contact of the two materials that wouldn't be the case though.