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This work is devoted to examine the effectiveness o f pyrazoles 4-(4,5-dihydro-1Hpyrazol-5-yl)-N,N-dimethylaniline (D) on corrosion of mild steel in a 1 M HCl solution, using weight loss measurement at concentration effe cts. The inhibitor (D) was synthesized in our laboratory. The formation of thi s pyrazole was carried out with hydrazine and α-unsaturated aldehydes, and the structure was check ed by spectroscopic means, such as FT-IR, 1H NMR and 13C NMR. Polarizat ion curves and electrochemical impedance spectroscopy (EIS) method s were used to assess both the corrosion rate and inhibition efficiency. Potentio dynamic polarization showed that D behaved as a mixed-type inhibitor. The Nyquist plot s showed that, while D concentrations increased, charge-transfer resistanc e i creased and double-layer capacitance decreased, involving increased inhibiti on efficiency. Adsorption of the inhibitor molecules corresponds to Langmuir adsorpt i n isotherm. Quantum chemical calculations showed that the inhibitor was prone to be protonated in the acid, and the results were in full agreement with experimental ob servations.

portugaliae electrochimica acta

Electrochemical and Theoretical Study of Pyrazole 4-(4,5-dihydro-1H-pyrazol-5-yl)-N,N-dimethylaniline (D) as a Corrosion Inhibitor for Mild Steel in 1 M HCl