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      저자 : ChandrabhanVerma, Sudershan (검색결과 1 건)
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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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