I had slime in a wheelbarrow for maybe 15 years, rim sort of folded up when I attempted to remove tire, no rust visible on the outside.
Had to replace an honda 3 wheeler rim after maybe 8-10 years.
Had noticeable corrosion in alloy wheels, not bad enough to replace, but there.
I know Discount tire hates dealing with slimed wheels/tires, makes a real mess. I'm dreading having to deal with one of my front tractor tires, it was slimed & wouldn't seal, so I took it in for a tube. I asked them to clean the slime out & offered to pay extra, but they said "No problem, we deal with this all the time." Got my wheel/tire back in about 5 minutes, & they threw it in the back of my truck. When I got home, I found the whole thing completely covered in slime- they just stuffed a tube in it & inflated it, squishing that crap out everywhere. My guess is that the bead is going to be glued on & the tube will be glued inside the tire.