An effective and accessible synthesis of alkoxy arylnicotinonitriles was achieved via a four-component reaction of 4-hydroxybenzaldehyde, acetophenones, malononitrile in the presence of RONa. The synthesized alkoxy arylnicotinonitrile derivatives containing pyridine moiety were predestined as inhibitors for C1018-steel (CS) corrosion in 1.0 M HCl using potentiodynamic-polarization (PDP) and electrochemical impedance spectroscopy (EIS) methods. PDP plots were demonstrated that the arylnicotinonitriles behave as typical inhibitors of the mixed-type. They have also suppressed the CS corrosion at lower [inhibitor] and accomplished an inhibition capacity ranged from 87.6 to 98.2% in 0.7 mM. Their adsorption on the CS interface follows the isotherm model of Langmuir and they include both chemisorption and physisorption mechanisms, with a preference of chemisorption. The morphology of the CS surface was examined utilizing Fourier Transform Infrared Spectroscopy (FTIR) and field-emission scanning electron microscopy (FE-SEM). Moreover, Density Functional Theory (DFT) calculations confirm the empirical findings and the adsorption of arylnicotinonitrile derivatives on the CS interface.
Keywords: Arylnicotinonitrile derivatives; One-pot syntheses; Corrosion inhibition; Surface morphology; DFT calculations; EIS
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Abd El-Lateef, H.; Abdelhamid, A. A.; Mohamed, M. A.; Moustafa, A. H. Beilstein Arch. 2019, 2019147. doi:10.3762/bxiv.2019.147.v1
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