Electrochemical behavior of copper in thiocarbamide solutions

It is shown that the kinetics of electrochemical processes in a copper-thio carbamide solution is of mixed character. The effective cathodic and anodic transfer coefficients beta = 0.25 and alpha = 0.4, reactions orders with r espect to the ligand 0.7 and 1.5, and the exchange current density i(0) con gruent to 10(-4) A/cm(2) are determined. Using the literature data on the t hiocarbamide adsorption on copper, the results are interpreted as evidence for the involvement of one thiocarbamide molecule from the bulk solution, a long with the adsorbed ligands, in an elementary act of copper dissolution.