How to electropolish bronze? Can anyone comment on electrolytes for bronze (high Sn)?

18 February 2019 0 9K Report

Hi! I am trying to electropolish Sn high (25%) bronze. Had some luck with phosphoric acid. Phosphoric acid mixed with sulfuric acid seems to develop some salt on the workpiece. Tried chromic acid+phosphoric+sulfuric which results a black film on the workpiece. Seems like chemistry is not matching. Can you please comment about your experience in electropolishing bronze? Any successful electrolytes?

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