Experimental and computational studies on hydroxamic acids as environmental friendly chelating corrosion inhibitors for mild steel in aqueous acidic medium
By Verma, Dakeshwar Kumar; Fantazi, Akram [Al; Verma, Chandrabhan; Khan, Fahmida; Asatkar, Ashish; Hussain, Chaudhery Mustansar; Ebenso, Eno E.
Published in Journal of Molecular Liquids
2020
Abstract
In the present study, three hydroxamic acids (HAs) namely acetohydroxamic acid (AHA), benzohydroxamic acid (BHA) and oxalohydroxamic acid (OHA) synthesized, characterized and used as inhibitors for mild steel corrosion in the electrolytic solution of 1 M HCl. Corrosion inhibition property of HAs was evaluated using several chemical, electrochemical, surface and computational methods. Results showed that studies HAs act as effective corrosion inhibitors and their inhibition efficiencies follow the order: OHA (96.37%) > BHA (95.69%) > AHA (93.29%). EIS study showed that studied HAs act as interface type inhibitors. Polarization study revealed that HAs demonstrate themselves as mixed type corrosion inhibitors and they adsorb on the active sites of metallic surface. Adsorption of HAs on metal-1 M HCl interfaces followed the Langmuir adsorption isotherm model. Surface morphological analyses of inhibited and uninhibited metallic surface were carried out using SEM-EDX and XRD methods. DFT analyses showed that studied compounds act as chelating type of ligands. Effect of Keto-enol tautomerism and different possible conformational isomers on metallic corrosion inhibition was demonstrated. The conformational isomers in which >C=O and –OH (hydroxyl) groups present in same side behave as chelating ligands and form relatively more stable complex than that of conformational isomers in which >C=O and –OH groups present in opposite side. Experimental and DFT studies well complimented each other.