Synergistic effect of iodide ion addition on the inhibition of mild steel corrosion in 1 M {HCl} by 3-amino-2-methylbenzylalcohol

By Obot, I. B.; Madhankumar, A.
Published in Materials Chemistry and Physics NULL 2016

Abstract

Abstract The inhibition of mild steel corrosion in 1 M {HCl} aqueous solution by 3-amino-2-methylbenzylalcohol (AMBA) was investigated using weight loss, electrochemical impedance spectroscopy (EIS), potentiodynamic polarization (PDP) and cyclic voltammametry (CV) techniques. Attenuated total reflectance infrared spectroscopy (ATR-IR), contact angle (CA) and scanning electron microscopy (SEM) measurements were carried out to confirm the adsorption of {AMBA} on mild steel surface. Computer simulations using density functional theory (DFT) and Monte Carlo methodologies were further employed to provide insights into the mechanism of interaction between the inhibitor and the steel surface. All the results confirmed that {AMBA} is a good corrosion inhibitor for mild steel in 1 M HCl. The addition of NaI was found to increase the inhibition effect of {AMBA} on mild steel to a considerable extent. {DFT} results reveal that the N atom together with the ?-systems in the aromatic ring were the active sites for the interaction of {AMBA} with steel surface. Furthermore, the negative value of the adsorption energy obtained from the Monte Carlo simulation indicates the stability of the adsorbed inhibitor film on the steel surface.

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