Corrosion inhibition of carbon steel by Roselle extract in hydrochloric acid solution: electrochemical and surface study

Corrosion inhibition of carbon steel by Roselle extract in hydrochloric acid solution:... The inhibiting effect of Roselle extract (Krd) on carbon steel in 0.5 M HCl solution was investigated by potentiodynamic polarization, electrochemical impedance spectroscopy (EIS), electrochemical frequency modulation (EFM), scanning electron microscopy (SEM), and energy dispersive X-ray (EDX) methods. It was found that Krd extract acts as a good inhibitor for carbon steel corrosion in the acid solution. The results showed that Krd extract simultaneously retarded the hydrogen evolution on the cathode and the metal dissolution on the anode, which indicated that this inhibitor is an excellent mixed-type (cathodic/anodic) inhibitor. The dissolution rate decreases with increasing Krd extract concentration and increases with increasing the temperature. The adsorption of Krd extract on the active cathodic sites was found to follow the Langmuir adsorption isotherm. The maximum inhibition approached 91.0 % in the presence of 500 ppm Krd using the EFM technique. The formation of a protective film on the carbon steel surface in the presence of Krd was shown and confirmed by SEM results. There are good agreements between EIS, EFM, the potentiodynamic polarization data, and SEM/EDX results. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Research on Chemical Intermediates Springer Journals

Corrosion inhibition of carbon steel by Roselle extract in hydrochloric acid solution: electrochemical and surface study

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Publisher
Springer Journals
Copyright
Copyright © 2014 by Springer Science+Business Media Dordrecht
Subject
Chemistry; Catalysis; Physical Chemistry; Inorganic Chemistry
ISSN
0922-6168
eISSN
1568-5675
D.O.I.
10.1007/s11164-014-1570-4
Publisher site
See Article on Publisher Site

Abstract

The inhibiting effect of Roselle extract (Krd) on carbon steel in 0.5 M HCl solution was investigated by potentiodynamic polarization, electrochemical impedance spectroscopy (EIS), electrochemical frequency modulation (EFM), scanning electron microscopy (SEM), and energy dispersive X-ray (EDX) methods. It was found that Krd extract acts as a good inhibitor for carbon steel corrosion in the acid solution. The results showed that Krd extract simultaneously retarded the hydrogen evolution on the cathode and the metal dissolution on the anode, which indicated that this inhibitor is an excellent mixed-type (cathodic/anodic) inhibitor. The dissolution rate decreases with increasing Krd extract concentration and increases with increasing the temperature. The adsorption of Krd extract on the active cathodic sites was found to follow the Langmuir adsorption isotherm. The maximum inhibition approached 91.0 % in the presence of 500 ppm Krd using the EFM technique. The formation of a protective film on the carbon steel surface in the presence of Krd was shown and confirmed by SEM results. There are good agreements between EIS, EFM, the potentiodynamic polarization data, and SEM/EDX results.

Journal

Research on Chemical IntermediatesSpringer Journals

Published: Mar 8, 2014

References

  • Some crown ethers as inhibitors for corrosion of stainless steel type 430 in aqueous solutions
    Fouda, AS; Abdallah, M; Al-Ashrey, SM; Abdel-Fattah, AA
  • Temperature coefficient of corrosion inhibition of steel by adenine
    Gomma, GK; Wahdan, MH
  • Electronegativity: the density functional viewpoint
    Parr, RG; Donnelly, RA; Levy, M; Palke, WE
  • Antibacterial drugs as environmentally-friendly corrosion inhibitors for carbon steel in acid medium
    Abdel Nazeer, A; El-Abbasy, HM; Fouda, AS
  • Inhibition of phosphoric acid corrosion of zinc by organic onium compounds and their adsorption characteristics
    Morad, MS
  • Some new triazole derivatives as inhibitors for mild steel corrosion in acidic medium
    Li, WH; He, Q; Pei, CL; Hou, BR
  • Corrosion and corrosion inhibition of Al and some alloys in sulphate solutions containing halide ions investigated by an impedance technique
    Abdel Rehim, SS; Hassan, HH; Amin, MA

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