I would reserve judgement until I saw them stripped of and blasted
If they have suffered severe corrosion I think maybe the complete structure and strength may have been compromised.. and the last thing you want is a wheel to let go on the motorway
You can get them crack tested and X-rayed , but the cost is going to throw that out of the window.. to be honest if they were mine and they looked as bad as your photos seem ,I'd junk them, lifes too short to mess with safety for the sake of a few quid