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In this study, Firstly, two synthesized thiosemicarbazide derivatives, N-(2-(2methoxyphenyl)hydrazinecarbonothioyl)benzamide (TSC4) and N-(2-(furan-2-carbonyl) hydrazinecarbonothioyl)benzamide (TSC5), were investigated as carbon steel corrosion inhibitors in 1.0 M HCl by potentiodynamic polarization (PDP), electrochemical impedance spectroscopy (EIS), fast Fourier transform continuous cyclic voltammetry (FFTCCV) and scanning electron microscopy (SEM). PDP results showed the mixed-type inhibition with predominantly anodic effect. EIS experiments showed the increase in polarization resistance and decrease in double layer capacitance by inhibitors adsorption. The maximum IE% values for the solutions containing 1.0×10 -3 M TSC4 and TSC5 were equal to 94.0% and 94.9%, respectively. FFTCCV results indicated that in addition to inhibition efficiencies, the rate of adsorption for TSC5 is higher than TSC4. In the next step, quantum chemical studies were performed for a five member group of thiosemicarbazide derivatives and revealed that among the calculated electronic parameters, ΔE, the energy gap between HOMO and LUMO, exhibited the maximum correlation (R 2 =0.97) with %IE. SEM analysis showed improvements of the surface characteristics in the presence of studied inhibitors.

international journal of electrochemical science

Electrochemical and Quantum Chemical Assessment of Some Thiosemicarbazide Derivatives as Carbon Steel Corrosion Inhibitors in HCl; Continuously Monitoring the Current Change by FFT Voltammetry