Electrochemical Investigation of Thiourea as Corrosion Inhibitor for Copper in Acidic Solution

摘要

The thiourea as a copper corrosion inhibitor in the base electrolyte (containing 0.54M H_2SO_4 and 0.88M CuSO_4) was investigated using electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization. The research results suggest that the inhibition efficiency depends on the concentration of the thiourea. The slopes of the cathodic and anodic Tafel lines are approximately constant and independent on the inhibitor concentration. Potentiodynamic polarization curves showed that thiourea acts as the mixed-up inhibitor. The results obtained from EIS measurements are in good agreement with that obtained from potentiodynamic polarization.