Many people will have either seen this done before, or done it themselves...but thought I'd share the results of my garage exploits this afternoon.
I had a Blue anodised Sugino 44t chainring, but needed a chrome one...so...
Chainring...blue:
Bucket, water, caustic soda....add the chainring:
...simmer...:
Remove...and then polish:
Chrome Sugino 44t chainring......DONE!
PS. If you try this, the caustic gives off venemous fumes when mixed with the water. Make sure you protect yourselves by wearing gloves, goggles and mask...and definately make sure the area is very well ventilated, ideally outdoors.