Yazar "Olasunkanmi, Lukman O." seçeneğine göre listele

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  • Küçük Resim
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    Effect of surface treatment on the bioactivity and electrochemical behavior of magnesium alloys in simulated body fluid
    (Wiley-V C H Verlag Gmbh, 2017) Sasikumar, Y.; Solomon, Moses M.; Olasunkanmi, Lukman O.; Ebenso, Eno
    The effect of surface treatment using NaOH or H2O2 on the bioactivity and corrosion behavior of AZX310, AZ91D, AM50, and AZ31 Mg alloys in simulated body fluid (SBF) has been studied with the aid of surface morphological assessment, in vitro characterization, and electrochemical measurements. The influence of immersion time on the behavior of the treated alloys in SBF was also investigated. X-ray diffraction (XRD) and scanning electron microscopy (SEM) analyses confirmed successful surface modification upon treatment of alloy surface with NaOH and H2O2. XRD and SEM analyses also revealed that surface modification enhances formation and growth of hydroxyapatite (HA). Formation of HA layer on the alloy surface was further confirmed by Fourier transform infrared spectroscopy analysis. In vitro immersion test reveals that pH of SBF solution containing treated alloys is lower than that containing untreated alloy. However, pH increases with immersion time. Results from weight loss and electrochemical measurements indicate that treated alloys possess higher corrosion resistance in SBF than the untreated ones. H2O2 treated alloys demonstrated greater corrosion resistance in SBF than NaOH treated alloys.
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    Öğe
    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, 2024) Ozturk, Serkan; Gerengi, Husnu; Solomon, Moses M.; Gece, Gokhan; Yildirim, 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,N2pentamethylethane-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 omega cm2 to 1908 omega cm2. A corrosion rate of 0.03 mm/ y and an inhibition efficiency of 93% is achievable after 24 h of immersion at 25 degrees 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.