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topic 2532

What specific gravity and iron content for electropolishing stainless steel?


We electropolish stainless steel parts (300 series) in a 60% phosphoric, 20 % sulfuric, 20% di water solution, and at 100 amps/ft2. I have two questions; What is the operating range for specific gravity and dissolved iron?, and What type of cathode material is best for this bath? Thanks in advance.

Dave Bernardini


We here at our company use a commercial product; 50 % vol. Phosphoric acid, 40 % vol. sulfuric acid and 10 % vol. of some secret stuff. We have been supplied with these figures:

At 20 °C:

and so on. It may depend on the composition of yourlyte, your amps, temperature, polishing time and so forth.

Hans Henrik Larsen
- .dk


Hello Mr Bernardini.The stainless steel (316L) is better cathode for electropolishing of Steels.

- Tehran, Iran

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