It's worth a try but I wouldn't be surprised if the rim isn't a victim of calcium chloride. If so, you will probably find it's pretty bad once the tire is off and you wire brush it.Looking at your pic, I'd say tires have about 30% left...good for another 5+ years!... and rims appear to only be rusted. I'd:
Remove tire, sandblast or wire brush rim to remove rust, loose paint, etc.
Treat any rusted areas with a rust converter... Extend or similar.
2 coats of primer on outside and 4+ HEAVY coats on inside.
Allow to thoroughly dry then 2 coats yellow and allow to thoroughly dry.
Replace/install tube, mount tire, add air, and...happy farming! Bob