Christine, Very few glues will work over/through oxidation, but the
oxidation itself is really easy to reproduce. If the challenge were
posed to me, I would sand/grind the contact areas and use either
Epoxy or contact cement, depending on the type of metal. Once
bonded, you can spray the area with vinegar or salt water and within
a couple of days, you will have a nicely oxidized area. You can
control the amount of oxidation by repeated applications of the
solution, exposure to the elements, etc.
The only other way I can think of would be to use cold connections
-- like rivets.