The influence of chloride ions on the anti-corrosion ability of binary inhibitor system of 5-methyl-1H-benzotriazole and potassium sorbate in sulfuric acid solution

In this work, the effect of chloride ions on copper corrosion behavior in an acidic sulfate solution, in the presence of binary inhibitor system of azoles and potassium sorbate was studied. Electrochemical measurements, weight loss measurements and surface analysis (SEM/EDS) were used in this investigation. Results of potentiodynamic polarization experiments indicate that azoles and potassium sorbate, in appropriate concentration, act as mixed-type inhibitors. Surface analysis (SEM/EDS) of copper confirmed that the rate of copper dissolution in aggressive medium is reduced as a result of formation of the protective layer on its surface.