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Difficulty Electropolishing 17-4 SS parts

March 11, 2008

Hi There

We manufacture small SS screws.We are able to get good electro polishing results on 304 SS parts,but when I run 17-4 SS parts in same bath they come out etched and lusture less.

Electrolyte bath 1s 75% Phosphoric acid and 25% sulfuric acid. Cathode material is 316 SS and 6V. I don't know why it is not working for 17-4?

Any suggestions are extremely welcome

Sanjay Goyal
manufacturer Elctro polisher - Ludhiana, Punjab, India

Because 17-4 contains Cu.

Jose Castellanos
- Minneapolis, MN, USA
March 28, 2008

If you change electrolyte according to our specifications, you can polish any stainless steel, carbon steel, copper, aluminum, molybdenum, nickel alloy - everything in one tank.

Anna Berkovich
~~Russamer Lab~~ - Pittsburgh, Pennsylvania
(ed. update July, 2025: sorry, Anna has retired)
April 13, 2008

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