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    Resistance of di-cationic surfactant containing pyridinium ions to metal oxidation in 1.0 M HCl medium
    (Elsevier, 2025) Ozturk, Serkan; Gultekin, Zafer; Akgul, Gulsen; Gece, Gokhan; Olasunkanmi, Lukman O.
    In order to prevent metal corrosion in low-carbon steel, which is exposed to faster corrosion in acidic environments, a di-cationic surfactant containing two pyridinium ions with high anti-corrosion potential was synthesized in this study. The structural characterization of the new compound was carried out by spectroscopic techniques (FT-IR and NMR). As a result of corrosion tests performed with electrochemical techniques such as potentiodynamic polarization (PDP) and electrochemical impedance spectroscopy (EIS) for different inhibitor concentrations (2, 10 and 50 ppm) in 1.0 M HCl solution at 25 degrees C, it was found that the anti-corrosion effect increases with increasing inhibitor concentration. The adsorption of the surfactant to the metal surface has been proven by the contact angles measured for pure water dripping on the metal surface. From the equilibrium constant and Gibbs free adsorption energy calculated by Langmuir adsorption isotherm, it was determined that this di-cationic surfactant has a high adsorption ability and adheres to the surface by chemical adsorption. The chemical indices of conceptual density functional theory (DFT) were also examined to develop an understanding of how molecular/electronic factors can alter inhibition efficiency of inhibitor compound. In addition to this process, a Monte Carlo Simulation study was also performed. The corrosion protection of the metal was visually examined by scanning electron microscopy (SEM) analysis, the elemental percentage of the metal surface was revealed by electron dispersive X-ray spectroscopy (EDX) analysis and the average roughness of the surface was determined by atomic force microscopy (AFM) analysis.
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    Synthesis, characterization, and studies of the interfacial and anticorrosion properties of a ternary cationic ionic liquid on carbon steel in a molar concentration of hydrochloric acid: Experimental and computational insights
    (Elsevier B.V., 2024) Öztürk, Serkan; Gerengi, Hüsnü; Solomon, Moses M.; Gece, Gökhan; Yıldırım, Ayhan; Olasunkanmi, Lukman O.
    Corrosion in acidic environments is a serious industrial challenge that must be addressed and cationic ionic liquid play a critical role in tackling the wet corrosion menace for the metal industry. For this purpose, a novel ternary cationic ionic liquid namely N1-(3-(11-(octadecyldimethylammonio)undecanamido)propyl)-N1,N1,N2,N2,N2-pentamethylethane-1,2-diaminium tribromide (Mono-18–11-di-N) is synthesized and elucidated for anticorrosion activity on St37–2 grade steel in a molar concentration of hydrochloric acid medium. The structural elucidation of Mono-18–11-di-N was achieved by FT-IR, 1H NMR, and 13C NMR methods while the electrochemical impedance spectroscopy (EIS), potentiodynamic polarization (PDP), dynamic-EIS, density functional theory (DFT) calculations, and Monte Carlo (MC) simulation techniques were adopted in the anticorrosion evaluation. The Critical Micelle Concentration (CMC) of Mono-18–11-di-N is 0.000491 M and at CMC, the surface tension is 21.86 dyn cm?1 inferring good surface activity properties. Mono-18–11-di-N is effective against the wet corrosion of St37–2 steel. It can, at 20 mg/L decrease the corrosion rate of the metal from 0.57 mm/y to 0.11 mm/y and enhance the polarization resistance from 363 ? cm2 to 1908 ? cm2. A corrosion rate of 0.03 mm/y and an inhibition efficiency of 93% is achievable after 24 h of immersion at 25 °C. Additionally, surface morphological examination using scanning electron microscope (SEM), energy dispersive X-ray spectroscopy (EDX), optical profilometer (OP), and atomic force microscope (AFM) methods prove the adsorption of Mono-18–11-di-N molecules on the substrate surface. Moreover, DFT and MC simulations revealed that Mono-18–11-di-N relies on lone pairs of electrons in bromide anion, oxygen, and nitrogen atoms to adsorb parallel to the St37–2 surface and protect it against corrosion. © 2023 Elsevier B.V.