Article

Research on Chemical Intermediates

, Volume 39, Issue 8, pp 3475-3485

First online:

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

  • Dris Ben HmamouAffiliated withEquipe de Génie de l’Environnement et de Biotechnologie, ENSA, Université Ibn Zohr
  • , Rachid SalghiAffiliated withEquipe de Génie de l’Environnement et de Biotechnologie, ENSA, Université Ibn Zohr Email author 
  • , Abdelkader ZarroukAffiliated withLCAE-URAC18, Faculté des Sciences, Université Mohammed Premier
  • , Belkheir HammoutiAffiliated withLCAE-URAC18, Faculté des Sciences, Université Mohammed Premier
  • , Omar BenaliAffiliated withDépartement de Biologie, Faculté des Sciences et de la Technologie, Université de Tahar Moulay Saïda
  • , Hassan ZarrokAffiliated withLaboratoire des procèdes de séparation, Faculté des Sciences
  • , Salem Salim Al-DeyabAffiliated withPetrochemical Research Chair, Chemistry Department, College of Science, King Saud University

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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.

Keywords

C38 steel Potassium ferrocyanide (Pf) Phosphoric acid Adsorption