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Synthesized Schiff bases from linoleic and benheric acids as inhibitor of mild steel corrosion in HCl medium

Author Affiliations

  • 1Department of Chemistry, Michael Okpara University of Agriculture, Umudike, Abia State, Nigeria
  • 2Department of Chemistry, Michael Okpara University of Agriculture, Umudike, Abia State, Nigeria
  • 3Department of Chemistry, Michael Okpara University of Agriculture, Umudike, Abia State, Nigeria
  • 4Department of Chemistry, Michael Okpara University of Agriculture, Umudike, Abia State, Nigeria

Res.J.chem.sci., Volume 8, Issue (9), Pages 12-25, September,18 (2018)

Abstract

Inhibitory performances of Schiff bases, 2[2-diethylamino) ethyl methyl amino)-4-methy1-5-3 (3-methyl sulfanyl propy1 amino) methylidene cyclohexdien-1-one (DEMS) and [1-(azepan-1-yl)-2-2-[4-(2-tert-butyl sulfanylethyl piperazin-1-yl] ethanone (ATSP) synthesized from linoleic and benheric acids on mild steel corrosion in HCl medium were assessed. Inhibition performances of the Schiff bases under study were assessed by gravimetric and potentiodynamic polarization methods. The inhibitors were characterized by Infrared (IR) spectrophotometry. Results obtained showed pronounced enhancements in efficiencies of the inhibitors as their concentrations gradually increased while a corresponding decline in efficiencies was observed with a rise in temperature of the medium. The measured corrosion data were best described by Langmuir isotherm with R2 values of 0.99. Thermodynamic studies on the inhibition process showed that the mode of adsorption of the Schiff bases followed physisorption. The negative entropy values obtained revealed increased disorderliness at the mild steel-inhibitor interface as concentrations of the Schiff bases gradually build up. Potentiodynamic polarisation results revealed that the inhibitors exhibited a mixed inhibition control

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