Electrodeposition of silver_tin alloys from pyrophosphate-cyanide electrolytes

摘要

Using cyclic-voltammetric techniques, a pyro_phosphate-cyanide electrolyte for the electrodeposition of compact Ag_Sn alloy coatings is investigated. This elec_trolyte is suited to further investigations on the alloy composition, structure and properties. The electrodeposit_ion of coatings with up to 40 wt% Sn is possible from the investigated complex electrolytes. The alloy surpasses the saturation limit of the silver lattice with Sn and allows the formation of coatings with phase heterogeneity. At high tin content an ordered spatial distribution of different alloy phases on the cathodic surface can be observed. The pat_tern formation in this system looks very similar to the phenomena and structures observed during electrodeposit_ion of other silver alloys, such as Ag_Sb, Ag_Bi and Ag_In.