I’m repairing a free-standing antenna tower (Wade DMX). Replacing the mast support brackets. Removing the rivets was surprisingly easy… so it seems the manufacturer uses aluminum rivets. That was a bit of a surprise, since I would expect a corrosion problem doing that.
Now I’m a bit puzzled. I can go on and on about aluminum rivets in aluminum structure (aerospace stuff) but now that the problem is reversed, in a steel structure this doesn’t seem right. Should I have expected steel rivets here?
I have lots of “aircraft” style rivets here of many aluminum alloys and have nice coatings - though none the right size for these holes. Since I’ll be getting more rivets to finish the job, is there a particular aluminum alloy type to be used here?
In the pictures below, no sign of corrosion at the rivet holes. There’s plenty of corrosion elsewhere on the tower (hence the repairs). Somehow the galvanized finish has been worn off in many places, but all the joints are fine. Is that due to a particular aluminum rivet type that was used? This tower is about 20 years old.