On-site 'out of the tank' Electropolishing process
November 17, 2009
Q. I need to Electropolish a Large vessel of 8 ft. diameter and 16 ft. height. Is there any other process than dipping to achieve the Electropolishing of such large components. Please help.
engineer - Belgaum, Karnataka, India
November 18, 2009
A. Some people use brush plating techniques to electropolish stainless, but I do not think that it is a practical method for an item as huge as what you want.
Safety of the operator needs to be a primary decision and a difficult one.
- Navarre, Florida
November 19, 2009
A. I agree with James - brush plating technology is your way forward. I suggest you don't try to do too much at once, and take the job in small steps; otherwise you will need some horrendous voltages.
R&D practical scientist
Chesham, Bucks, UK
Conductive pads for ElectropolishingFebruary 2, 2017
Q. He have five SS316 plates (3x1,5m) that a client asked us to electropolish for a custom process that they have. So we currently use electrically conductive brushes (carbon fiber/copper) and using those brushes for such big area would require a LOT of time.
We are thinking about using a pad to cover a bigger area. (0,1m^2) Maybe using a piece of ceramic fiber (which doesn't conduct electricity) dipped heavily in the electrolyte. Or perhaps using an electrically conductive pad ... Although we don't know which material we could use, perhaps just carbon fiber cloth dipped in electrolyte.
Could you guys please recommend to me a material for this endeavour?
Q&A Dept - Dusseldorf, Germany
^- Privately contact this inquirer -^
A. Hi Leslie. You used a gmail address and provided no other company info so I don't know what kind of an enterprise your company is. The reason I am curious is because I don't think you are necessarily approaching this job the best way. This doesn't sound like an appropriate application for brush electroplating -- but rather for sending out for conventional electropolishing by dipping. This would be a relatively small, simple, and fast job for conventional tank electropolishing rather than a development program for brush electropolishing. The Electroplating Engineering Handbook has an excellent chapter on the subject, and Metal Coating Process Corp. [a finishing.com supporting advertiser] could advise you further. Good luck.
Ted Mooney, P.E. RET
Pine Beach, New Jersey
Striving to live "Aloha"
February 2, 2017
A. Ted's correct. These plates *could* be brush electropolished, but it would be a messy and time consuming job.
A company doing tank electropolishing would make quick work of them and likely produce better results.
March 17, 2017
You need to have a special electrolyte to do pad-local electropolishing.
We use Universal electrolyte that does not leave etched areas on the borders during local electropolishing. Bama Technologies from Turbigo, Italy, licensed our Universal Electrolyte and local polishing device design. You can ask them to sell you some electrolyte. Or contact us for Universal Electrolyte pad polishing technology.