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Q&A on Barrel / Bulk Electropolishing of small stainless steel parts



A discussion started in 2000 & continuing through 2017

(2000)

Q. We want to electropolish small parts (1/4 inch long and 1/8 inch in diameter) in batches of 2000 at a time in a barrel. The parts are made of 316 SS.

1. What is your experience of barrel electropolishing?

2. Will it work as well as rack ?

3. Any particular care we should take ?

Any suggestions?

Thank you for all replies

R Malo
New Jersey and India


A. Mr. Malo, Most electropolishing processes that utilize bulk methods are proprietary to individual companies.

Dave McKay
Cleveland, Ohio


October 18, 2008

A. Hi, R. Unfortunately I guess I have to agree with Dave. I did a quick lit search and came up empty on barrel electropolishing. I've seen electropolishing done in tiny little bowls for dental and medical needs, and I've seen large production electropolishing in a rack operation, and seen the inside of tanks electropolished, but sorry I've never personally seen a barrel electropolishing operation. Chemical polishing, vibratory finishing, and tumbling might be alternatives.

Regards,

Ted Mooney, finishing.com Teds signature
Ted Mooney, P.E. RET
finishing.com
Pine Beach, New Jersey



Electropolishing of small carbon steel parts

(2002)

Q. We are manufacturing screwdrivers of Slotted head (-) and Phillips head (+) types. We use different metals to manufacture screwdriver bits like carbon steel, stainless and bronze metals. We are facing descaling, deburring and polishing problems. Currently we are using tumbling barrel with some media and chemicals but the result is not satisfactory. Some days ago we electropolished some screwdriver bits of carbon steel in laboratory by using a solution of phosphoric acid 75%, sulphuric acid 15%, chromic acid 10% and have excellent results. Can we use electropolishing method for bulk quantities for deburring and polishing the above three metals (carbon steel, stainless steel, bronze)?

What type of equipment should use? What type of solution will give best result? Can we replace chromic acid with some other?

Naveed Ahmed
- Lahore, Pakistan


A. Hi Naveed. If you can feed these screwdriver bits with a vibratory feeder to align them and load them into plating racks, you will probably find it easier than electropolishing in a barrel or basket because the variable current involved in bulk electropolishing can result in etching instead of polishing. Good luck.

Regards,

Ted Mooney, finishing.com
Teds signature
Ted Mooney, P.E. RET
finishing.com
Pine Beach, New Jersey



To minimize searching and offer multiple viewpoints, we've combined multiple threads into the dialog you're viewing. Please forgive any resultant repetition or failures of chronological order.



(2001)

Q. How can small stainless steel parts (bolts/nuts/washers) be polished cost-effectively?

Please help.

Gary Erber
- Johannesburg, South Africa


(2001)

A. Barrel electropolishing is a recognized technology. The barrel is indexed periodically and current is applied with the barrel at rest. Titanium screen is the material of choice for barrel construction.

Dan Weaver
- Toccoa, Georgia


(2001)

A. A very efficient and economical way to electropolish small pieces is through a barrel process. Several parts can be placed in the unit and achieve the finish. You do, however, have to be cautious on the type of parts and how they are going to placed. There may be some "dead" areas on the parts where no contact has been made, edges may overlap, and the ID's cannot be critical.

Donna Nowak
- Cleveland, Ohio



(2003)

RFQ: Hi,

I am looking for someone who can BARREL electropolish stainless steel. I would like to electropolish small stainless steel rings about 1/4 - 3/8 in diameter. We do approx. 100,000 at a time. Rack electropolishing is not cost effective.

Thanks,

Joe T [last name deleted for privacy by Editor]
- Bartlett, Illinois, USA
^- Sorry, this RFQ is outdated
     View Current RFQs




October 1, 2014 -- this entry appended to this thread by editor in lieu of spawning a duplicative thread

Q. We are a supplier of small Stainless steel Capillary pieces as per below dimensions:
ID: 0.58 mm
OD: 0.82 mm
Length: 45 mm

We are currently doing Electropolishing with Sulfuric Acid. But we are not getting good shine and surface of Capillary pieces still remain dull after electroplating.

Please suggest some process or chemical by which we can shine our capillary tube pieces in bulk quantity.

thanks

Chintan Panchal
- Ahmedabad, Gujarat, India


Electroplating Engineering Handbook

October 2014

A. Hi Chintan. Please review the electropolishing chapter in the Electroplating Engineering Handbook =>
to understand what they call the "etching" range and the "polishing" range of current density. Because the current swings radically during conventional barrel processing, you probably cannot get polishing. Some hints are given in the above dialog that a titanium barrel which periodically indexes, instead of constantly rotating, may be one of several keys towards getting the process to run satisfactorily. Best of luck.

Regards,

Ted Mooney, finishing.com
Teds signature
Ted Mooney, P.E. RET
finishing.com
Pine Beach, New Jersey


October 1, 2014

A. Bulk electropolishing of small stainless steel parts is possible and doable. We have installed such process already in BAMA company in Turbigo, Italy.

adv.
It requires Universal electrolyte, which we have licensed to them. Electropolishing is conducted in the device, similar to the wheel, submerged into the electrolyte.

anna_berkovich
Anna Berkovich
Russamer Labs
supporting advertiser 
Pittsburgh, Pennsylvania
russamer labs banner


September 6, 2017

A. You can definitely Electropolish 316 stainless small parts in bulk using a barrel. I had one and used it to polish several million stainless jewellery parts. My barrel was constructed from titanium mesh supported on a bearing at one end only. It had an extra titanium mesh anode suspended inside from the open end. It was excellent and would polish approximately a 200ml cup of small parts in a few minutes. Current and exposure time needed careful experimentation to optimise results. Quantity was determined by a fully exposed layer of components laying across the base of the barrel. Barrel would rotate slowly at about 5 seconds per single revolution. A few minutes additional polish in walnut shell media with a centrifugal or vibro bowl ensures a chrome like silky brilliant shine.

Ed Palmer
London, UK



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