-- The Home Page of the Finishing Industry

on this site
current topics

60,000 Q&A topics -- Education, Aloha, & Fun

topic 17082



I'm having a terrible time electropolishing cast CF8M (316 SS). The part is a typical 1/2" flange valve with an internal water passage. The problem takes place in the water way. When the parts come back from the electropolisher they look fine on the outside, but nothing seems to have taken place along the entire internal passage way of the valve. The electropolisher tells me this is related to electrical chargers and the only way to eliminate it is with extensive tooling setups. Any advise would be appreciated.

- EPHRATA, Pennsylvania



I have experienced the same problems and your electropolisher is correct they would have to actually fixture an electrode down in the water passageway of your valve(with out touch the side walls) in order to get the finish that you desire. That would be very expensive.

There are many other treatments that can be done. I would recommend a pickling process first to remove any contaminants and then a passivation process using a citric acid bath....this bath can provided you with a very clean part inside and out and the appearance was very close to what we where getting during electropolishing (depending on which casting process was used to make your part, some don't get that luster appearance)

But, for your sake, it would be worth it to try some samples and talk to a metal improvement specialist to be sure your achieving what your looking for on your parts. Oh ya, the pickling and passivation should be cheaper takes a lot of current($$$$) for the electropolishing process as compared to a timely bath in citric acid.


Keith Osborn
- Mentor, Ohio, USA

this text gets replaced with bannerText
spacer gets replaced with bannerImages

Q, A, or Comment on THIS thread SEARCH for Threads about ... My Topic Not Found: Start NEW Thread

Disclaimer: It's not possible to diagnose a finishing problem or the hazards of an operation via these pages. All information presented is for general reference and does not represent a professional opinion nor the policy of an author's employer. The internet is largely anonymous & unvetted; some names may be fictitious and some recommendations may be deliberately harmful.

  If you need a product/service, please check these Directories:

JobshopsCapital Equip. & Install'nChemicals & Consumables Consult'g, Train'g, SoftwareEnvironmental Compliance

©1995-2020, Inc., Pine Beach, NJ   -   About   -  Privacy Policy
How Google uses data when you visit this site.