Research on Chemical Intermediates

, Volume 39, Issue 8, pp 3475–3485

Studies on the inhibitive effect of potassium ferrocyanide on the corrosion of steel in phosphoric acid

Authors

  • Dris Ben Hmamou
    • Equipe de Génie de l’Environnement et de Biotechnologie, ENSAUniversité Ibn Zohr
    • Equipe de Génie de l’Environnement et de Biotechnologie, ENSAUniversité Ibn Zohr
  • Abdelkader Zarrouk
    • LCAE-URAC18, Faculté des SciencesUniversité Mohammed Premier
  • Belkheir Hammouti
    • LCAE-URAC18, Faculté des SciencesUniversité Mohammed Premier
  • Omar Benali
    • Département de Biologie, Faculté des Sciences et de la TechnologieUniversité de Tahar Moulay Saïda
  • Hassan Zarrok
    • Laboratoire des procèdes de séparationFaculté des Sciences
  • Salem Salim Al-Deyab
    • Petrochemical Research Chair, Chemistry Department, College of ScienceKing Saud University
Article

DOI: 10.1007/s11164-012-0892-3

Cite this article as:
Ben Hmamou, D., Salghi, R., Zarrouk, A. et al. Res Chem Intermed (2013) 39: 3475. doi:10.1007/s11164-012-0892-3
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Abstract

In this work, the effect of potassium ferrocyanide (Pf) on the corrosion of mild steel in solutions of phosphoric acid (H3PO4) has been investigated in relation to the concentration of the inhibitor by weight loss, potentiodynamic polarization and AC impedance (EIS) measurements. The results obtained revealed that this compound is good a mixed-type inhibitor. The effect of temperature on the corrosion behavior with the addition of optimal concentration of Pf was studied in the temperature range 298–328 K. The value of inhibition efficiency decreases slightly with the increase in temperature. Changes in impedance parameters (charge transfer resistance, Rt, and double layer capacitance, Cdl) were indicative of adsorption of Pf on the metal surface, leading to the formation of a protective film. Adsorption of Pf on the C38 steel surface was found to obey the Langmuir adsorption isotherm. Some thermodynamic functions of dissolution and adsorption processes were also determined.

Keywords

C38 steelPotassium ferrocyanide (Pf)Phosphoric acidAdsorption

Copyright information

© Springer Science+Business Media Dordrecht 2012