The steering wheel center round, after it's Evapo-Rust bath and some further cleaning and sanding smooth. Here's the inside, with the factory-applied black. I'd read somewhere that these parts had crackle-paint applied, but this center clearly had smooth paint on both inside and out. The chip at top is from where I had to hammer out a dent.
The outside. The surface corrosion (rust) remenants are very visible, but if you run your fingers over the surface it feels as smooth a silk. This will get a coat of rust converter as primer to neutralize any remaining rust, and perhaps a two-part epoxy primer as well, for longevity.