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        Gingko biloba fruit extract as an eco-friendly corrosion inhibitor for J55 steel in CO2 saturated 3.5% NaCl solution

        Yuanhua Lin,Yuanhua Lin,Eno. E. Ebenso,Wanying Liu,Jie Pan,Bo Huang 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.24 No.-

        The inhibition of the corrosion of J55 steel in 3.5 wt.% NaCl solution saturated with CO2 by the fruit extract of Gingko biloba (GFE) has been studied using mass spectrometry (MS), Fourier transform infrared spectroscopy (FTIR), electrochemical impedance spectroscopy (EIS), potentiodynamic polarization, contact angle measurements, and scanning electron microscopy (SEM). Inhibition efficiency was found to increase with increasing concentration of the extract. The adsorption of the extract on the J55 steel surface obeyed the Langmuir adsorption isotherm. The adsorbed film on J55 steel surface containing inhibitor was confirmed by the contact angle, and SEM results. The results obtained showed that the GFE could serve as an effective inhibitor of the corrosion of J55 steel in 3.5% NaCl saturated with CO2.

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        Interfacial adsorption behavior of quaternary phosphonium based ionic liquids on metal-electrolyte interface: Electrochemical, surface characterization and computational approaches

        Goyal, Madhusudan,Kumar, Sudershan,ChandrabhanVerma, Sudershan,Bahadur, Indra,Ebenso, Eno E.,Lgaz, Hassane,Chung, Ill-Min Elsevier 2020 Journal of Molecular Liquids Vol.298 No.-

        <P><B>Abstract</B></P> <P>In present study two quaternary phosphonium salts namely (1-NapthylMethyl)-triphenylphosphonium Chloride (1-NpMe-TPC) and (4-Methoxybenzyl)-triphenylphosphonium Bromide (4-MeOBz-TPB) are reported as inhibitors for mild steel (MS) corrosion in 0.5MH<SUB>2</SUB>SO<SUB>4</SUB> using various electrochemical, theoretical and surface morphological techniques. Inhibitors 1-NpMe-TPC and 4-MeOBz-TPB were prepared by diluting the solution of concentration 10<SUP>−2</SUP> to 10<SUP>−5</SUP> M and results are showed maximum efficiencies of 99.72% and 97.76%, respectively at 10<SUP>−3</SUP> M concentration (298K). Polarization measurements revealed that both 1-NpMe-TPC and 4-MeOBz-TPB acted as mixed corrosion inhibitors. EIS study revealed that 1-NpMe-TPC and 4-MeOBz-TPB adsorbed at the mild steel/0.5M H<SUB>2</SUB>SO<SUB>4</SUB> interfaces and enhanced the magnitude of charge transfer resistances. Adsorption of the 1-NpMe-TPC and 4-MeOBz-TPB at the metallic surface was further supported by SEM and AFM studies. Several thermodynamic parameters ( Δ G a d s 0 , Δ H a d s 0 and Δ S a d s 0 ), Semi-empirical AM1 and MD parameters were derived in order to <SUP>describe</SUP> the adsorption behavior of 1-NpMe-TPC and 4-MeOBz-TPB on metallic surface. The reasonable consistence was found between experimental and theoretical results.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Quaternary phosphonium ionic salts are reported as corrosion inhibitors. </LI> <LI> Electrochemical, theoretical and surface morphological techniques were used. </LI> <LI> The results were supported by SEM, AFM and QC Calculations. </LI> </UL> </P>

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