Green synthesis of corrosion inhibitor with biomass platform molecule: Gravimetrical, electrochemical, morphological, and theoretical investigations

Abstract

Abstract Considering the concept of green chemistry and the vision of human sustainability, a new corrosion inhibitor named N1-(2-aminoethyl)-N2-(2-(2-(furan-2-yl)-4,5-dihydro-1H-imidazol-1-yl) ethyl) ethane-1,2-diamine (NNED) is synthesized from biomass platform molecules. Both weight loss and electrochemical measurements demonstrated that the corrosion inhibitor had good anti-corrosion performance for carbon steel in 1\u202fM HCl medium, with inhibition efficiency higher than 90% at lower level of inhibitor concentration (5\u202fppm). The adsorption of NNED on the steel surface was spontaneous and obeys the Langmuir adsorption isotherm. The corrosion morphology was studied by scanning electron microscopy (SEM) and atomic force microscopy (AFM). Force-distance curve directly quantified the adhesion force between the adsorption films and the metal surface. Quantum chemical calculation and molecular dynamics simulation were applied to study the corrosion inhibition mechanism.