Abstract
Limiting currents were measured for the electropolishing of vertical copper cylinders in orthophosphoric acid (H 3PO 4) under natural convection conditions. The variables studied were the H 3PO 4 concentration, the presence of a diaphragm between the cathode and anode compartments and the cylinder height. It was found that the limiting current in a single-compartment cell was higher than that in a two-compartment cell by 15–23.7% depending on the H 3PO 4 concentration; this was attributed to the stirring effect induced at the anode surface by the cathodically evolved hydrogen bubbles in a single-compartment cell. The limiting current was found to decrease with increasing cylinder height and increasing H 3PO 4 concentration.
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