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Got to sandblast and clean a rusty lathe chuck at work. And couldn't help but post this immaculately clean chuck
Understandable!
I fell into a rabbit hole on YouTube a while ago, people restoring old toys, often rusted, and the sandblasting step was always really satisfying.
Sandblasting some of that may give you trouble. You probably want to polish the scroll and pinions, as well as the surfaces they mount on. Additionally, polish the mating surfaces between the back and front of chuck where they slide together. Also, ways of the jaws.
Otherwise, it may freeze up or require a lot more force to overcome the friction of the mechanism. Due to the increases surface area small voids, you may find that corrosion rapidly reoccurs.
In general, it is best to stone and polish movements like this and re apply grease. I'm a fan of a thin layer of black moly, but grease types can be a religious issue.
Edit, mold to moly
Yeah, that's probably a better idea, but the chucks are heavily abused in the grinding department and my hands are tied because of my supervisor, so odds are ill still just sandblast them. But good to know if I ever restore a chuck outside of work, thanks for the idea!!