Carboxamide derivatives as new corrosion inhibitors for mild steel protection in hydrochloric acid solution
2019; Elsevier BV; Volume: 151; Linguagem: Inglês
10.1016/j.corsci.2019.02.019
ISSN1879-0496
AutoresRoghayeh Sadeghi Erami, Mehdi Amirnasr, Soraia Meghdadi, Milad Talebian, Hossein Farrokhpour, K. Raeissi,
Tópico(s)Hydrogen embrittlement and corrosion behaviors in metals
ResumoIn 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.
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