Electrodeposition of Cu-Sn alloys: theoretical and experimental approaches

摘要

In this study, Cu-Sn alloy was electrodeposited from aqueous electrolytic bath onto Mo electrode. Before electrodeposition, some calculations using MATLAB software to obtain the dominant complex of Cu-citrate in different pH values and cyclic voltammetry (CV) experiments was performed. The potential range in which the alloy electrodeposition process could be carried out in a solution containing CuSO_4, SnSO_4, and Na_3C_6H_5O_7 was determined by CV. In addition, the effects of boric acid and cetyl trimethyl ammonium bromide (CTAB) surfactant on codeposition potential were studied. The microstructural properties and alloy composition were investigated by scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS), respectively. Alloy composition up to 49.5 at.% of Sn was obtained. Alloy composition of 33 at.% Sn corresponding to Cu_2SnS_3 was obtained at solution containing 0.04 M SnSO_4, 0.02 M CuSO_4 and 0.4 M Na_3C_6H_5O_7 at Potential -0.75 V.