Peculiarities of Electrochemical Behavior of Copper in Alkaline Solutions in the Presence of Alanine

E. V. Nikitchenko^a, S. A. Kaluzhina^a, and N. P. Andreeva^b

^aVoronezh State University, Universitetskaya pl. 1, Voronezh, 394006 Russia

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^bFrumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences,
Leninskii pr. 31, Moscow, 119991 Russia

Received February 28, 2005

Abstract — Anodic oxidation of copper in alkaline solution in the presence of alanine is studied by electrochemical and ellipsometric methods. Thickness of films formed on the metal in the working solutions, are determined. Small additives of -alanine (10^–4–10^–3 mol/l) cause additional stabilization of copper passivity due to an increase in the film thickness. The adsorption kinetics of - and -alanine is studied. It is shown experimentally that -alanine adsorbs on copper according to the Frumkin isotherm. By contrast, no definite type isotherm can be obtained for -alanine due to its higher activity and ability to form soluble complexes with copper ions.