The Silver painted ones (85-87?) might have been but the dark paint colors I think were just bare steel. I'm looking at a 83 or a 84 and the PO was a sweater and where he sweat on it there is rust. He didn't rinse it and it took its toll. Its not horrible but its it includes a large area of the top tube and it includes the cable guide. Its going to probably need a total repaint to look right.

This is the underside of the top tube near the head tube. No sign of chrome.