ELECTROCHEMICAL DISSOLUTION OF A ZINC ELECTRODE POLARIZED BY ALTERNATING CURRENT IN A NEUTRAL MEDIUM (NA2SO4)

This article discusses the electrochemical dissolution of zinc sulfate solution, sodium registration method potendinamicheskih polarization curves. It has been found that when anodic into solution as divalent ions, and further by reacting with water formed hydrolysis hydroxide , postponing which generates on electrode surface passivation layer . With increasing pH from 2 to 5 occurs rate reduction. At 10, oxidation proceeds a large over potential, however due form hydroxo metal dissolves at same rate. The influence electrolyte temperature process zinc. increase current maxima. By temperature- kinetic calculate effective activation energy, overvoltage 300, 500 700 mV, its value was 17.8 15.5 15.4 kJ / mol, respectively, indicates occurrence diffusion mode.