Bern, I live on an island so the salt air is enough to keep me busy, road salt must be a nightmare. and not just on your rims.
I never had any problems with the powdercoated clear on the wheels I did , even dog piss didnt worry them. Tire changing just required a bit of care, I always did that myself and still do.
I had Queensland Nameplates in Brisbane do anodizing for me , very good but expensive now no doubt.
Tons of anodized parts rims etc for the little shit boxes here, after 6 mths in the sun the anodize starts fading.
I 've stripped the colored anodizing off the rims here for the little shit boxes with a mix of 1-4 drain cleaner and water, rips it straight off, there is anodizing and anodizing. but the finish is on par with clear powdercoat, you lose that shine.
constant attention is the go. I use California Purple polish , I wouldnt use anything else I used to think Autosol was the go and before that Goddards Glow, wouldnt use either of them ever again.