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Partial Electrode Processes at AC-Polarized Copper in Chloride and Nitrate Media |
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15.12.2008 г. |
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Partial Electrode Processes at AC-Polarized Copper in Chloride and Nitrate Media O. Yu. Kuksina, V. Yu. Kondrashin, and I. K. Marshakov Voronezh State University, Universitetskaya pl. 1, Voronezh, 394006 Russia Received January 23, 2004 Abstract — The dissolution of a copper electrode by passing a rectangular alternating current of an infralow frequency (1/6 Hz) was studied by chronopotentiometric method. The near-electrode concentrations of copper oxidation products were calculated by the numerical solution of the boundary problem of transient diffusion. In concentrated chloride electrolytes, the shape of the E vs. t plot was found to be determined by transient mass transfer. The ratio of the copper reduced during the cathodic half-period to its amount dissolved in the anodic half-period was estimated experimentally. This ratio was used to determine the distribution of faradaic charges between different partial electrode processes. In nitrate electrolytes, cathodic process significantly affects the anodic dissolution of copper.
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