Assessment of Glycine Propyl Ester Lauryl Hydrochloride as Sustainable Mild Steel Corrosion Inhibitor in 1M HCl

摘要

Corrosion is a severe challenge which restricts the use of Mild Steel (MS) in various applications where it comes in contact with aggressive chemicals and conditions. In this regard, different inhibitors were chosen, but environment unfriendliness of such inhibitors is a primary cause of concern. The present work describes the corrosion inhibiting properties of the synthesized amino acid derivative i.e., glycine propyl ester hydrochloride on the corrosion of MS in 1M HCl by employing gravimetric, electrochemical measurement techniques. EIS studies indicated the formation of adsorbed shielding film on the steel/electrolytic solution interface by the inhibitor molecules whose existence was affirmed by SEM/EDX. FT-IR spectroscopic analyses affirmed the presence of chemical interactions between the inhibitors and MS surface. The evaluated compound works as an effective inhibitor for acid corrosion at substantially lower concentration and its adsorption on the MS surface was found to follow the Langmuir adsorption isotherm Calculated thermodynamic parameters for adsorption unveiled a strong interaction amongst the inhibitor-MS surface. The electrochemical results revealed that the inhibitor act as mixed-type. Theoretical calculations using DFT were accomplished to ascertain the mechanism of corrosion inhibition.