Carboxamide derivatives as new corrosion inhibitors for mild steel protection in hydrochloric acid solution

By M. Amirnasr, S. Meghdadi, M. Talebian, H. Farrokhpour, K. Raeissi. Corrosion Science, 2019

214 citations recorded by the source corpus.

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.

Subfields: Civil and Structural Engineering, Materials Chemistry, Metals and Alloys

View Paper: https://www.semanticscholar.org/paper/65c44c8accbd48d96df79fc8e3f8b692e381d4d7