Abstract
The corrosion inhibition effect of new azomethine compounds: PhNNC (COCH3)NC6H4Y {Y=OCH3 (SB1), CH3 (SB2), H (SB3), Br (SB4) and Y=Cl (SB5)} on mild steel in 1M HCl, was investigated using potentiodynamic polarization, electrochemical impedance spectroscopy (EIS) and quantum chemistry analysis. It has been found that the inhibition efficiency increased with increasing inhibitor concentration. The polarization curves showed that these Schiff bases function as mixed inhibitors. The adsorption of studied compounds on mild steel surface was found to follow the Langmuir isotherm. Molecular modeling was used to correlate corrosion inhibition properties and calculated quantum chemical parameters.
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