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Lab scale electropolish

Discussion in 'Electronic Basics' started by Bill, Jul 24, 2004.

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  1. Bill

    Bill Guest

    I recall a lab-scale procedure for electropolishing small stainless
    parts (size of a paperclip or smaller). I seem to remember it was
    done in sulphuric acid (12N) with carbon electrodes and ~100 mA
    current, although all of the numbers above are from memory and likely
    wrong.

    Does anyone have any guidelines regarding how to electropolish small
    stainless parts? Thanks!

    Bill
     
  2. Google turns up 3,950 hits for electropolish. That might be a good
    place to start.

    Cheers!

    Sir Charles W. Shults III, K. B. B.
    Xenotech Research
    321-206-1840
     
  3. Bill

    Bill Guest

    Of those 3950 hits... 3900 are commercial products or services in
    nature. I thought I had a good start anyway!

    I was hoping more for a reply like "sure... just take a variac and a
    120 to 12 volt transformer, bridge rectifier and a coupple of
    capacitors and carbon electrodes from an old dry cell battery and
    current limiting resistor and electropolish away!". At least you
    posted.. thanks anyway!

    Bill
     
  4. This reference does not explain all the chemistry but reviews all the
    steps necessary:
    http://www.electropolish.com/pubs/process_steps.pdf
     
  5. John Fields

    John Fields Guest

     
  6. Bill

    Bill Guest

    Thanks to all for replies. I finally found the following procedure if
    anone is interested:

    Variable DC supply, 0-24V to 1A
    Solutin og 60% phosporic acid, 20% sulphuric acid, and 20% water as
    electrolyte
    Stainless rod to serve as cathode, part to be polished attached to
    anode
    Start with 100 mA for a few seconds; inspect part with magnifier

    We'll see how it turns out!

    Bill
     
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