Synthesis of aza-pseudopeptides and the evaluation of their inhibiting efficacy of mild steel corrosion in 1.0 M HCl

  • R. Chadli
  • A. ELherri
  • H. Elmsellem
  • M. Elazzouzi
  • N. Merad
  • A. Aouniti
  • B. Hammouti
  • J. K. Mulengi
  • A. Zarrouk
Physicochemical Problems of Materials Protection
  • 24 Downloads

Abstract

Two novel aza-pseudopeptides such as 2-(1-(3-methyl-5,6-dihydropyridazin-1(2H)-yl)-1-oxopropan-2-yl)isoindoline-1,3-dione (E10) and 2-(2-(5-(4-(dimethylamino) phenyl)-4,5-dihydro-1H-pyrazol- 1-yl)-2-oxoethyl) isoindoline-1,3-dione (E12) were synthesized, characterized by FTIR, 1H NMR, 13C NMR, and tested as corrosion inhibitors for mild steel in 1.0 M HCl. The inhibition effect of the prepared compounds was studied by electrochemical impedance spectroscopy, Tafel polarization and quantum chemical calculations. The experimental results suggest that these compounds are efficient corrosion inhibitors and the inhibition efficiencies increase with increasing their concentrations. The efficiencies obtained from EIS measurements were in good agreement with those obtained from the polarization measurements. Polarization curves revealed that the prepared compounds act as mixed type inhibitors. The interaction between inhibitor and surface of steel obey Langmuir isotherm. The density functional theory was employed for theoretical calculations, and the obtained results were found to be consistent with the experimental findings.

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Copyright information

© Pleiades Publishing, Ltd. 2017

Authors and Affiliations

  • R. Chadli
    • 1
    • 2
  • A. ELherri
    • 1
  • H. Elmsellem
    • 3
  • M. Elazzouzi
    • 3
  • N. Merad
    • 4
  • A. Aouniti
    • 3
  • B. Hammouti
    • 3
  • J. K. Mulengi
    • 2
  • A. Zarrouk
    • 3
  1. 1.Department of ChemistryFaculty of Exact sciences University DjillaliLiabesSidi Bel AbbesAlgeria
  2. 2.Laboratory of Organic chemistry, Natural Products and Analysis (COSNA). Department of ChemistryFaculty of Exact sciences University AbouBeker Bel KaidTlemcenAlgeria
  3. 3.LCAE-URAC18, Faculty of ScienceMohammed first UniversityOujdaMorocco
  4. 4.Laboratory of Natural Products and Bioactivity (LASNBIO). Department of ChemistryFaculty of Exact sciences University AbouBeker Bel KaidTlemcenAlgeria

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