Silver‐Gold Alloys Prepared by Pulse Plating: Modeling of the Chemical Composition

Abstract

The individual and simultaneous deposition of silver and gold from low cyanide concentration solutions showed two regions in the potentiodynamical j‐E curves. At low overpotentials, these processes take place through adsorbed species while at high overpotentials the normal diffusional region is observed. Then, when pure silver and gold deposits are prepared by galvanostatic pulse plating, the presence of adsorbed species cannot be disregarded. This phenomenon prevails and has an important effect when silver and gold are simultaneously deposited by pulse plating. Therefore, the chemical composition of the alloys is described by a model in the activation region while another model was deduced for the diffusional region. The models take into account typical parameters of pulse plating and were developed by application of the statistical experimental design methodology.