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Inhibitive Effect of Molybdate Ions on the Electrochemical Behavior of Steel Rebar in Simulated Concrete Pore Solution

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Abstract

Several compounds tested as corrosion inhibitors have proven to possess good effectiveness in protection of steel rebar in concrete. However, most of them are considered as pollutant compounds, which limits their use. The aim of this work is to investigate the inhibitive effect of sodium molybdate, which is considered as a nonpollutant compound, against pitting corrosion of steel rebar in simulated concrete pore solution. Corrosion behaviors of steel in different solutions were studied by means of corrosion potential, potentiodynamic polarization, and electrochemical impedance spectroscopy. The results indicate that the addition of sodium molybdate to the chlorinated solution decreases significantly the corrosion rate of steel. Due to its passivating character, the sodium molybdate inhibitor promotes the formation of a stable passive layer on the surface of steel, acting as a physical barrier against chloride ions, on one hand, and consolidating the passivation mechanism of steel, on the other. The optimal inhibition rate is given by the concentration of molybdate ions, corresponding to a [MoO4 2−]/[Cl−] that is equal to 0.5.

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Authors and Affiliations

  1. Laboratoire des Interactions Matériaux Environnement (LIME), Université de Jijel, BP 98, Ouled Aîssa, 18000, Jijel, Algeria

    Hakim Bensabra (Research Teacher) & Noureddine Azzouz (Professor)

  2. Department of Materials Engineering, Catholic University of Leuven, Kasteelpark Arenberg 44, 3001, Heverlee, Belgium

    Agnieszka Franczak (Research Associate)

  3. Université de Reims Champagne Ardenne, Laboratoire LISM, UFR Sciences, B.P. 1039, 51687, Reims Cedex 2, France

    Omar Aaboubi (Professor) & Jean-Paul Chopart (Professor)

Authors
  1. Hakim Bensabra
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  2. Agnieszka Franczak
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  3. Omar Aaboubi
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  4. Noureddine Azzouz
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  5. Jean-Paul Chopart
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Correspondence to Hakim Bensabra.

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Manuscript submitted December 26, 2015.

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Bensabra, H., Franczak, A., Aaboubi, O. et al. Inhibitive Effect of Molybdate Ions on the Electrochemical Behavior of Steel Rebar in Simulated Concrete Pore Solution. Metall Mater Trans A 48, 412–424 (2017). https://doi.org/10.1007/s11661-016-3778-y

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  • DOI: https://doi.org/10.1007/s11661-016-3778-y

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