ELECTROCHEMICAL BEHAVIOR OF COPPER IN AQUEOUS SOLUTIONS OF POTASSIUM BROMIDE

For the first time there were established the regularities of copper dissolution in an aqueous solution of potassium bromide. The electrochemical behavior of copper in the solution of potassium bromide was studied by removal of cyclic and anodic potentiodynamic polarization curves. The effect of the potential sweep rate and temperature of the electrolyte were investigated in the process of oxidation of copper. It was found that by the increasing of anodic potential sweep rate within the 25-200 mV/ s on polarograms were increased value of the maximum current of the oxidation of copper and a shift of the maximum value of the potential in the anode region. It is shown that with increasing temperature of the electrolyte from 25 to 65 degrees C on polarization curves as well increase in the anodic current maximum oxidation of copper was observed. From the temperature dependence of solution and the logarithm of the current there was calculated the effective activation energy of the anodic reaction and it is equal to 2.86 kJ / mol, and it allows to assume that the anodic oxidation of the copper in the solution of potassium bromide takes place in the diffusion regime. It is found that the electrode reactions which take place at the copper electrode in a solution of potassium bromide proceed by a complex mechanism and shows that the anodic polarization copper is oxidized with a formation of monovalent and divalent copper ions. For the first time it was suggested that the surface of the copper electrode is formed by copper (I) bromide.