Abstract
The behaviour of copper, a single-phase brass and a duplex aluminium bronze, during electropolishing in orthophosphoric acid has been examined in terms of polarization curves and the effects of temp. and acid concentration. A change in mechanism of electropolishing was apparent at about 37°C; below this temp. an activation energy of 5·9 kcal/mole was found while above it was 4·2 kcal/mole. The copper alloys were satisfactorily electropolished in similar solutions to those used for pure copper, but at high overpotentials the duplex bronze was subject to deal uminification of the second (Υ 2) phase.
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