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We investigate the influence of anion-cation composition of an aqueous medium on the etching rate in an acid electrolyte and the resistance of the insulation of a filled oxide coating. We reveal the cations and anions of the aqueous medium that increase the etching rate of the coating and decrease its insulation resistance. We establish that Al3+ and Mg2+ cations and SiO 32- anions have a considerable...
We investigate anodic dissolution of copper in H2SO4 + H2O and H2SO4 + H2O + CuSO4 systems, which model solutions for the electrochemical production of copper (+2) sulfate. Ultimate densities of anodic current in the temperature range 20–80°C for a voltage up to 8 V were found. We show that a concentration of copper ions ( Cu2+) of 1.5–2.0 moles/liter in the anolyte is the limiting one in the electrochemical...