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The earliest explanations of electropolishing were given by Jacquet and Elmore. Jacquet attributed electropolishing to the formation of a viscous layer on the workpiece [1]. The non-uniform thickness of the viscous layer over the material surface results in a different ohmic resistance from the cathode to the anode. This cause greater dissolution of the protruded parts compared to the depressed part, thus creating a uniform surface profile. This explanation was later challenged by Elmore who studied the current-voltage relationship for the polishing of copper in orthophosphoric acid system. He attributed the polishing effect to a varying concentration gradient of the dissolved metal ions over the protrusions and valleys [3].

Electropolishing of Carbon Steel in Presence of Some Natural Polymers under Natural and Forced Convection Conditions