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Abstract
Peculiarities of nickel electroplating from glycine-containing baths with different pH are considered as a function of the following factors: amino acid concentration, temperature, potential scan rate, and rotation rate of a disk electrode. Based on these data, a possible mechanism is proposed. It assumes that all the complexes present in the bath are reduced simultaneously so that the recorded cathodic current is determined by each current contribution. In the process, the reduction of Ni(II) glycinate complexes proceeds irreversibly and is controlled by the charge-transfer stage. The process involves an adsorption stage and a stage of a preliminary chemical reaction. The latter may represent the dissociation of nickel complexes or their mutual transformations caused by pH variations in the near-electrode solution layer.[PUBLICATION ABSTRACT]