Effect of non-stationary current regimes on the morphology of silver electrodeposits

Abstract

This work is concerned with the use of reverse current regimes in order to form small-grained and compact silver deposits during the electrorefining process. Several parameters were varied, i.e., i) anodic overpotential, ii) cathodic vs. anodic time ratio and iii) duration of the anodic pulse. After optimization of these parameters, phosphate ions were added and the electrolyte was stirred. The effects of a rise of the anodic overpotential on the grain sizes of the silver deposit and compactness were studied. Prolongation of the anodic time had a similar influence but with a decrease in current efficiency. An increase of the cathodic vs. anodic time ratio caused an enlargement of the grains and a decrease in the compactness of the deposit. Optimal morphological characteristics were obtained when 3-4 PO were added and the electrolyte was stirred.

Microstructure and corrosion behavior of Zn-Co alloys deposited from three different plating baths

“…SEM and optical microscopy have proved themselves to be convenient methods for the analysis of the surface morphology of electrochemical deposits 29,30 and in determining the crystallite size in alloy deposits. SEM and optical microscopy have proved themselves to be convenient methods for the analysis of the surface morphology of electrochemical deposits 29,30 and in determining the crystallite size in alloy deposits.…”