Abstract
Abstract This work studies the influence of temperature (25–55 °C) and hydrodynamic conditions (0–2000 rpm) on corrosion inhibition of a azomethine compounds: PhN N C (COCH3) = NC6H4Y {Y = OCH3 (SB1), CH3 (SB2), H (SB3), Br (SB4) and Y = Cl (SB5)} on mild steel in a 1 M HCl. Potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) techniques were employed. The results of electrochemical measurements show that the inhibition efficiency increased with increasing compound concentration and decreasing with temperature and hydrodynamic condition. The adsorption process on mild steel surface obeyed Langmuir isotherm. The associated activation parameters and thermodynamic data of adsorption were evaluated and discussed. The inhibition mechanism was determined by potential of zero charge (PZC) measurements. Corrosion attack morphologies were observed at stagnant and hydrodynamic conditions to verify qualitatively the results obtained by electrochemical methods.
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