Font Size: 

The inhibition effect of new hydrazone derivative (Hyd-Iso) on the corrosion of carbon steel in 1 M HCl solution at 298K was studied practicing Potentiodynamic polarization and EIS methods. The obtained results showed that (Hyd-Iso) was an effective inhibitor in HCl medium. The inhibition efficiency, η(%), increased with the increase in concentration inhibitor. The activation dissolution thermodynamic parameters were calculated and discussed.  Tafel curves reveal that (Hyd-Iso) behaves as a mixed-type inhibitor with cathodic predominance and obeyed Langmuir adsorption isotherm. With the aim of extracting the parameters of the electrochemical impedance spectroscopy an appropriate equivalent circuit model was offered. In addition, the mechanism of inhibition was also studied via DFT (Density functional theory) treatment of (Hyd-Iso) molecule