Moringa oleifera plant extract as a copper corrosion inhibitor in binary acid mixture (HNO3 + H3PO4)

Authors

  • Hussein Alaa El Mansoura University, Chemistry Department, Faculty of Science, Mansoura, Egypt Author
  • Dossoki Farid I. El Port-Said University, Chemistry Department, Faculty of Science, Port-Said, Egypt Author

DOI:

https://doi.org/10.5937/zasmat1803422F

Keywords:

Copper corrosion, (HNO3 + H3PO4), Moringa oleifera leaves extract, EIS, EFM, AFM, SEM

Abstract

The behavior of Cu in 1 M mixture of nitric and phosphoric acids containing different concentrations of moringa oleifera leaves (MOL) extract has been studied by weight loss (WL) and electrochemical techniques [potentiodynamic polarization (PP), electrochemical impedance spectroscopy (EIS), and electrochemical frequency modulation (EFM)]. The maximum inhibition efficiency was found to be 89% at concentration 0.300 mol L-1 of the extract at 298K after 3 hours immersion period. The inhibition efficiency (IE) increased with increasing the extract concentration while decreased with increasing the temperature indicates that the extract is physically adsorbed on Cu surface. The adsorption of the extract follows Langmuir adsorption isotherm. Some thermodynamic parameters of activation and adsorption processes were also determined and discussed. Surface analysis was also studied.

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Published

15-09-2018

Issue

Vol. 59 No. 3 (2018)

Section

Articles