finishing.com logo
    HOME / sitemapFAQsBOOKSHelp WantedsAdvertiseContact   you are here: Hotline/Forum => Letter 2963
most fun in metal finishing

Procedure for electropolishing stainless steel

-

Hi What's the best way of electropolishing stainless steel?

frank sarrazit
- sheffield


Your question isn't specific enough to be answerable within the confines of the forum, Frank, because explaining the whole process takes about 20 pages. Please see the chapter about electropolishing in the Electroplating Engineering Handbook; it's excellent and quite complete. But if that text isn't readily available, the Metal Finishing Guidebook, and ASM Metals Handbook Vol. 5 have pretty good introductions. If anything is unclear, please come back here and ask for clarification. Thanks.

pic of Ted Mooney Teds signature
Ted Mooney, P.E. RET
finishing.com
Brick, New Jersey

-

If you can give me more information on the specifics of what you are doing we may be able to help.

David Crocker
- Valencia, California


-

Frank Sarrazit: Metal Coating Process Corporation holds monthly seminars on the subject of stainless steel electropolishing. The program is intended, in part, to help answer broad questions on this topic.

You can find us in the suppliers' listing on this web site. There is also a link to our own web site, where you will find an outline of the program and a schedule of future dates.

Ed Bayha
Metal Coating Process Corporation

Charlotte, North Carolina, USA



-

I am trying to solve an electropolishing problem with T304SS wire (0.187" dia). We are experiencing random problems with electroplating wire shelves, wherein some of the wires come out with a "frosty" surface. SEM/EDS has not identified any contaminants, and metallography of cross-sectional samples reveals that the "frosty" areas appear to be corroded (i.e., substantially amount of metal loss re: the good electropolished wires). Is there something with the bare wire that I should look for? Thanks,

JIM CIRILLI
TESTING LABORATORY - NEW CASTLE, DELAWARE


-

What you are describing (frosty look, loss of metal) sounds like etching. I believe that the two most common causes are the current density too low and water in the electropolishing solution.

pic of Ted Mooney Teds signature
Ted Mooney, P.E. RET
finishing.com
Brick, New Jersey


-

Do not electroclean before electropolish, soak clean only. Look for excessive solution movement, this will break down the "viscous layer"; the magic layer necessary for EP to take place. Also if you are doing wire goods remember SS is a lousy conductor, is the article picture framing?

Hope this is helpful.

Jon Quirt
- Fridley, Minnesota


June 10, 2012

Q. Why would you not Electroclean before Electropolishing? Pardon my ignorance, but that seems counterintuitive.

Scott Merritt
- Eastman, Georgia, United States


-

If Electro-Polishing is passivation, why passivate? Should passivation be completed before electro-polishing? Can nitric passivation before Electro-polishing accomplish adequate pre-cleaning necessary for electropolishing? What is the best method to pre-clean before electropolishing and what chemical, acidic or alkaline?

Mike Cochara
- Springfield, Missouri


-

Electro-polishing inherently passivates, and obviates the need for separate passivation. Prepare by alkaline soak cleaning; nitric acid is not an effective cleaner for dirt, oil, and greases.

pic of Ted Mooney Teds signature
Ted Mooney, P.E. RET
finishing.com
Brick, New Jersey


.

Q. Is it necessary to put a 316 SST weldment through pickling if it gets bead blasted prior to electropolishing?

Oswaldo Rangel
- London, Ontario, Canada


+

Q. I have Electro Polishing Machine. I am doing the polishing work on stainless steel for home products i.e. steel glasses.

My problem is as follows:- I mix Sulphuric - 50 kg & phosphoric 100 kg. and the temp. to make water hot is 60 to 80 degrees. and the time takes around 25 minutes. But after doing all this I can't get the perfect shine / brightness on glasses.

Can you give me the solution for this whereby I can get the perfect shine and less consuming time?

Please help me in this regard. It will be my great achievement Sir. Awaiting your reply.

Regards,

Dhiresh Chauhan
- Mumbai, Maharashtra, India


October 24, 2011

Hi, Dhiresh. Unfortunately, there are about 20 pages of things you must do right, including proper cleaning, proper formulation, proper temperature, proper racking, proper agitation, proper current density, proper procedure to exclude pre-cleaning rinsewater ... which conspire to make it nearly impossible for anyone to guess which one or ones were missed. But it seems like you have a pretty good understanding of the process, so my first thought is that the shape, position, and racking of the glasses is causing trouble. Please try your best to electropolish a simple flat shape and let us know the result. Good luck.

Regards,

pic of Ted Mooney Teds signature
Ted Mooney, P.E. RET
finishing.com
Brick, New Jersey



May 9, 2013 -- this entry appended to this thread by editor in lieu of spawning a duplicative thread

Q. Hello,
Somebody can recommend me how to build electropolish laboratory in my factory?

Michael Rachilevsky
- Tel aviv, Israel
  ^- Privately contact this inquirer -^


May 9, 2013

A. Hi Michael. The process sequence is quite easy: electroclean, double rinse, electropolish, double rinse. But it's not easy to do right if you have no prior experience, although the Electroplating Engineering Handbook will be a big help. There are companies like the site's supporting advertiser Metal Coating Process Corporation who specialize in educating people on electropolishing, and other companies like our supporting advertiser Russamer Lab who license their knowledge and processes. Good luck.

Regards,

pic of Ted Mooney Teds signature
Ted Mooney, P.E. RET
finishing.com
Brick, New Jersey

ADD a Q or A to THIS thread START a NEW THREADView This Week's HOT TOPICS

disclaim

 seek

JobshopsCapital Equip. & Install'nChemicals & Consumables Consult'g, Train'g, SoftwareEnvironmental ComplianceTesting Svcs. & DevicesUsed & Surplus


©1995-2014 finishing.com     -    Privacy    -    Search