Ultrasonic Cleaning And Polishing

check this link;

http://www.bransonultrasonics.com/

they can answer your question, they also have a lab for testing.

For polishing parts, you should look at a tumbler.

I too used to work in a GE shop that fabricated/cleaned/inspected aircraft engine tubes and used sonic cleaning and hand polishing. My 2 cents is you could sonic clean the tubes in a mildly abrasive slurry that is sonically driven, but the problem with that is you will also wear down any threaded connections (such as AN fittings) which are not properly protected, and you'll have to go back and manually polish any ferrules and fittings anyway. You'll also have to adress issues of the tube being uniformly polished so that you dont develop thin spots in the tube. All in all, I think its going to be quicker and of better quality to hand grind/polish your tubes with scotchbrite and jewelers wheels. Anything that will chemically remove oxidation from welding/brazing will also remove parent material from the parts that dont need it, and chemically polishing probably wont remove die marks left in the tube from your hydraulic mandrel benders.

Pumping an abrasive paste through the inside will often do a good job of polishing inside manifolds. Often it is the only way, when you can't get your little polishing tools into the crevices. Of course then you have to get the compound out, but that isn't too difficult. Made my own compound from plumber's putty and valve grinding compound once...results were pretty good. But then I was porting a 57 chevy intake manifold...not the same thing at all. Processes used on aircrafts require somebody to sign off on any new process...and those people are awfully conservative....grin!

If you are just trying to get rid of grinding and sanding marks, you might look into elecropolishing. This is a counterintuitive process similar to electroplating, but hooked up backwards, to take a little bit of metal off of the part instead of putting a little bit of metal onto the part. It comes off the "peaks" first, leaving it all nicely polished There are people who do this job professionally, a yellow pages search of your area would find somebody.