Hi Ray,
My brother used to own a body shop some years back. I would work there summers and after school as a kid. We used to have this special primer that was yellow and had a clear catlyst that you added to it, that was called etching primer for priming aluminum and I think chrome. Today there has to be something better than that. I would call a independent body shop and ask if they can paint chrome, that will give you the info you need.
Good Luck
Luis