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Experimental Investigation and Quantum Chemical Calculations of Some (Chlorophenyl Isoxazol-5-yl) Methanol Derivatives as Inhibitors for Corrosion of Mild Steel in 1 M HCl Solution

  • Sadeghzadeh, Rogayeh (Department of Chemistry, Tabriz Branch, Islamic Azad University) ;
  • Ejlali, Ladan (Department of Chemistry, Tabriz Branch, Islamic Azad University) ;
  • Eshaghi, Moosa (Department of Chemistry, Tabriz Branch, Islamic Azad University) ;
  • Basharnavaz, Hadi (Department of Chemistry, Faculty of Science, University of Mohaghegh Ardabili) ;
  • Seyyedi, Kambiz (Department of Chemistry, Tabriz Branch, Islamic Azad University)
  • Received : 2019.06.07
  • Accepted : 2019.09.16
  • Published : 2019.10.31

Abstract

In this study, two novel Schiff base compounds including (3-(4-Chlorophenyl isoxazole-5-yl) methanol and (3-(2,4 dichlorophenol isoxazole-5-yl) methanol as corrosion inhibitors for mild steel in 1 M hydrochloric acid solution were investigated by potentiodynamic polarization, electrochemical impedance spectroscopy (EIS), and density functional theory (DFT) computations. The results showed that the corrosion inhibition efficiency (IE) is remarkably enhanced with the growing concentration of the Schiff base inhibitors. The results from Tafel polarization and EIS methods showed that IE decreases with gradual increments of temperature. This process can be attributed to the displacement of the adsorption/desorption balance and hence to the diminution of the level of a surface coating. Also, the adsorption of two inhibitors over mild steel followed the Langmuir adsorption isotherm. Too, the results of the scanning electron microscope (SEM) images showed that the Schiff base inhibitors form an excellent protective film over mild steel and verified the results by electrochemical techniques. Additionally, the results from the experimental and those from DFT computations are in excellent accordance.

Keywords

References

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