DOUBLE-LAYER STRUCTURE ON RENEWED ELECTRODES OF SN-PB ALLOYS IN THE PRESENCE OF ORGANIC-SUBSTANCES

Impedance measurements of the dependences of the double-layer capacita nce on the potential (C, E-curves) were carried out on the electrodes of a Sn-Pb alloy (Pb content was ca. 1 wt %), which were renewed by cu tting in Na2SO4 solutions with cyclohexanol and camphor additives. The experimentally observed time changes in the C, E-curves from the mome nt of the electrode renewal indicate that suface-layer enrichment by l ead atoms occurs. Analyzing the experimental data testifies that the r ate of this process is abnormally high and depends on the structure of the electrode/solution interface. The possibility of using a model ex plaining the movement of Pb atoms over the surface through the surface -diffusion mechanism was discussed and substantiated.