Abstract
A method of determination of the throwing power (TP) of electrolytes in conditions of forced convection in a Hull cell with a rotating cylindrical electrode is presented. The method is used to determine TP of a copper plating electrolyte containing 0.15–0.5 M CuSO4 and 1 M H2SO4 at current densities of up to 75 mA cm-2. The TP decreases with increasing current density at a constant iav/id ratio, where iav is the average working current density and id the limiting diffusion current density. With increasing the iav/id ratio due to an increase in the cathodic polarizability conditions for an increase in TP may be achieved. In optimum (for uniform deposition) modes, iav/id ∼ 0.4–0.5. The TP may increase upon diluting electrolyte with respect to its main component.
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