Adsorption and corrosion inhibitive properties of synthesized hydrazine compounds on N80 steel/hydrochloric acid interface: Electrochemical and DFT studies

Corrosion inhibition performance of synthesized hydrazine compounds, namely, (13E)-2-(2-(4-bromophenyl)-2,5-dihydrothiazol-5-yl)-1-(1-(4-bromophenyl)-2-(1H-1,2,4-triazol-1-yl) ethylidene)hydrazine (BDBH) and (13E)-2-(2,5-dihydro-2-phenylthiazol-5-yl)-1-(1-phenyl)-2-(1H-1,2,4-triazol-1-yl) ethylidene)hydrazine (DPPH) on N80 steel in 15% HCl solution was studied using potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) techniques. Polarization studies showed that both studied inhibitors were of mixed type in nature. The adsorption of inhibitors on the N80 steel surface obeys Langmuir adsorption isotherm. The potential of zero charge (EPZC) for the N80 steel was determined by electrochemical impedance spectroscopy method. Scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX) and atomic force microscopy (AFM) were used to characterize the surface morphology of uninhibited and inhibited N80 steel specimens. The density functional theory (DFT) was employed for theoretical calculations.