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

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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, R t, and double layer capacitance, C dl) 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.

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Acknowledgments

Prof. S.S. Deyab, Prof. B. Hammouti and Prof. R. Salghi extend their appreciation to the Deanship of Scientific Research at King Saud University for funding the work through the research group project No. RGP-VPP-089.

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Authors and Affiliations

  1. Equipe de Génie de l’Environnement et de Biotechnologie, ENSA, Université Ibn Zohr, BP 1136, Agadir, Morocco

    Dris Ben Hmamou & Rachid Salghi

  2. LCAE-URAC18, Faculté des Sciences, Université Mohammed Premier, BP 4808, Oujda, Morocco

    Abdelkader Zarrouk & Belkheir Hammouti

  3. Département de Biologie, Faculté des Sciences et de la Technologie, Université de Tahar Moulay Saïda, Saïda, Algeria

    Omar Benali

  4. Laboratoire des procèdes de séparation, Faculté des Sciences, Kénitra, Morocco

    Hassan Zarrok

  5. Petrochemical Research Chair, Chemistry Department, College of Science, King Saud University, P.O. Box 2455, Riyadh, 11451, Saudi Arabia

    Salem Salim Al-Deyab

Authors
  1. Dris Ben Hmamou
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  2. Rachid Salghi
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  3. Abdelkader Zarrouk
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  4. Belkheir Hammouti
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  5. Omar Benali
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  6. Hassan Zarrok
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  7. Salem Salim Al-Deyab
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Correspondence to Rachid Salghi.

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Ben Hmamou, D., Salghi, R., Zarrouk, A. et al. Studies on the inhibitive effect of potassium ferrocyanide on the corrosion of steel in phosphoric acid. Res Chem Intermed 39, 3475–3485 (2013). https://doi.org/10.1007/s11164-012-0892-3

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  • DOI: https://doi.org/10.1007/s11164-012-0892-3

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