Mine were pretty rusty too. I think the problem is the little center cap on the rim. It allows water to get in and it seems to hold it there allowing rust. The metal isn't treated either. Now that mine are clean from the axle work that was done, I'll be coating them with something, maybe plasti dip.
2010 KK Sport, Detoures Knucklebone & backbone, smittybilt XRC 10, rigid led lights, R/L sliders & rack, cb, EMT2, R/K 15x7, OME, JBA, mopar skids & hitch, headlight covers, 4.10's and TruTracs