Influence of the Composition of the Liquid Phase and the Concentration of Benzohydrazide on Its Effectiveness during Cadmium Electrodeposition from Water
Acetone Perchlorate Electrolytes
V. V. Kuznetsov, L. M. Skibina, and R. R. Khalikov
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Department of Chemistry, Southern Federal University, ul. Zorge 7, Rostov-on-Don, 344090 Russia
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Received May 3, 2007
Abstract — Cadmium–benzohydrazide complexes (2 : 1) were found to be the main electroactive species in cadmium electrodeposition from water–acetone perchlorate baths. The discharge of these complexes is preceded by their dissociation at the cathode (zone of water structure stabilization) or in the bulk of the solution (zone of acetone structure stabilization). In the microheterogeneity zone of the mixed solvent, the complexes can be reduced from the adsorbed state. The process is best inhibited at low concentrations of benzohydrazide (
= 10
4 mol/l), when the electrode is covered with a very dense layer of adsorbed benzohydrazide and acetone molecules. With an increase in 
, perchlorate anions become more adsorbable, which is accompanied by increasing facilitation of the discharge reaction (
'-effect). The strongest depolarizing effect of Cl
anions is observed in the zone of acetone structure stabilization, which is due to selective solvation of the anion and the desalting effect of the mixed solvent.
= 104 mol/l), when the electrode is covered with a very dense layer of adsorbed benzohydrazide and acetone molecules. With an increase in , perchlorate anions become more adsorbable, which is accompanied by increasing facilitation of the discharge reaction ('-effect). The strongest depolarizing effect of Cl anions is observed in the zone of acetone structure stabilization, which is due to selective solvation of the anion and the desalting effect of the mixed solvent.
PACS numbers: 82.45.-Qr
DOI: 10.1134/S2070205109030034