I can't help you with any salt experiences, but I have these rims and the center caps painted or powdercoated differently somehow than the rest of the rim. I've had the center cap start losing paint on one of the rims. I took it in to Americas Tire
(where I bought them) and they replaced them for free, so it wasn't too big of a deal. Other than that they have been great. I haven't had this happen to any of the other rims so I don't know if this was just an isolated case or effects all rims. Just a little heads up
Edit: What I'm trying to get at is I don't know if the center cap would start chipping paint if it was hit with salt while you were driving.