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Abstract In this study, the inhibitive performance of carboxamide ligands, (N-(quinolin-8-yl) quinoline-2-carboxamide), Hqcq; and (N-(quinolin-7-yl) pyrazine-2-carboxamide), Hqpzc, was examined under steady condition in HCl solution at 25 °C for mild steel.… Click to show full abstract
Abstract In this study, the inhibitive performance of carboxamide ligands, (N-(quinolin-8-yl) quinoline-2-carboxamide), Hqcq; and (N-(quinolin-7-yl) pyrazine-2-carboxamide), Hqpzc, was examined under steady condition in HCl solution at 25 °C for mild steel. These carboxamides were synthesized using TBAB as green reaction medium. Electrochemical impedance spectroscopy (EIS) revealed that these inhibitors act via adsorption at metal/solution interface. The adsorption of inhibitors obeys the Langmuir adsorption isotherm. It is clear that Hqcq exhibits a better inhibitory performance presumably due to its uniform film and nearly planar and parallel arrangement on metal surface. The thermodynamic parameters (Ea, Kads, ΔG°ads) have also been calculated and discussed.
Journal Title: Corrosion Science
Year Published: 2019
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