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The effect of potassium sorbate as well as 5-chloro-1H-benzotriazole – potassium sorbate on the corrosion behavior of copper in acidic sulfate media containing Cl ions was examined. For this purpose, the electrochemical methods and quantum chemical calculations were used. The inhibition efficiency in the presence of 5-chloro-1H-benzotriazole – potassium sorbate was higher than in the presence of potassium sorbate. Also, the inhibition efficiency of binary inhibitor depends on the concentration of Cl ions added in sulfate solution. According to the results obtained by potentiodynamic polarization measurements, both potassium sorbate and 5-chloro1H-benzotriazole – potassium sorbate behave as mixed type inhibitors. Quantum chemical parameters are in good agreement with results obtained by electrochemical measurements.

5-chloro-1H-benzotriazole and potassium sorbate as binary corrosion inhibitor of copper in acidic solution