Performance of Thiosemicarbazone to Protect Copper Against Corrosion in A 3% NaCl Solution, Experimental and Theoretical Studies

In recent years, the use of inhibitors remains the most adopted method for the protection of metals and alloys against aggressive media. The objective of this work is to test the inhibiting effect of thiosemicarbazone noted TSC vis-à-vis the corrosion of copper in a 3% NaCl solution. In this study, we used stationary (potentiodynamic measurements), and transient (impedance diagrams) methods in the absence and presence of different concentrations of inhibitors. Polarization curves showed that thiosemicarbazone acts as a mixed inhibitor. Its effect results in a potential shift towards the anodic direction and a significant decrease in current density. Electrochemical impedance diagrams show the capacitive behavior of copper in a 3% NaCl solution. The addition of the inhibitor at different concentrations leads to a change in the corrosion mechanism with an increase in the polarization resistance, consequently, the inhibitory efficiency increases and reaches 95% for a concentration of 10-3 M. This testifies to the significant protective effect of thiosemicarbazone against copper corrosion in 3% NaCl.