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SECM investigation of electrochemically synthesized polypyrrole from aqueous medium

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Abstract

The electrochemical behavior of polypyrrole (PPy)-coated carbon steel (CS) was investigated in aqueous NaCl solution by scanning electrochemical microscopy. Oxygen concentration and pH were monitored by placing Pt and Sb microelectrodes, respectively, over the CS sample surfaces while soaking them in corrosion media. The PPy layer provided anodic protection, as well as a physical barrier, against the corrosive effect. The ratio of these properties was dependent on the thickness of the coating. Electrosynthesis of PPy/CS was achieved in an aqueous solution of sodium tartrate and pyrrole using cyclic voltammetric and galvanostatic techniques. The coatings were characterized by X-ray photoelectron spectroscopy and scanning electron microscopy. The doping rate calculated from XPS spectra was estimated at 15 %. The corrosion protective extent of the coating was tested in 3 % NaCl solution using three different techniques: linear polarization, open circuit potential, and electrochemical impedance spectroscopy. PPy offered significant protection against corrosion, with the coating resistance decreasing as immersion time increased.

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Acknowledgments

This work was supported by the MESRSFC and CNRST (Morocco) under Grant No PPR/30/2015 and cooperation agreements between Morocco and Hungary (CNRST/NIH) 1091/2014/CNR.

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Authors and Affiliations

  1. Laboratoire des Matériaux et Environnement (LME), Département de Chimie, Faculté des Sciences, Université Ibn Zohr, B.P. 8106, Agadir, Morocco

    A. El Jaouhari, M. Laabd, A. Albourine & M. Bazzaoui

  2. Department of General and Physical Chemistry, Faculty of Sciences, University of Pécs, Ifjúság útja 6, Pécs, 7624, Hungary

    D. Filotás, A. Kiss, L. Nagy & G. Nagy

  3. János Szentágothai Research Center, University of Pécs, Ifjúság útja 20, Pécs, 7624, Hungary

    D. Filotás, L. Nagy & G. Nagy

  4. Laboratoire de Chimie des Matériaux (LCM), Département de Chimie, Faculté des Sciences, Université Mohammed Ier, 60000, Oujda, Morocco

    E. A. Bazzaoui

  5. Departamento de Engenharia Química, Faculdade de Engenharia, Universidade do Porto, Rua Roberto Frias, 4200-465, Porto, Portugal

    J. I. Martins & M. Bazzaoui

  6. Department of Mechanical Systems Engineering, Faculty of Engineering, Hiroshima Institute of Technology, 2-1-1 Miyake, Saeki-ku, Hiroshima, 731-5193, Japan

    R. Wang

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  1. A. El Jaouhari
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  2. D. Filotás
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  5. E. A. Bazzaoui
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  6. L. Nagy
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  7. G. Nagy
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  8. A. Albourine
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  9. J. I. Martins
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  10. R. Wang
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  11. M. Bazzaoui
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Correspondence to M. Bazzaoui.

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El Jaouhari, A., Filotás, D., Kiss, A. et al. SECM investigation of electrochemically synthesized polypyrrole from aqueous medium. J Appl Electrochem 46, 1199–1209 (2016). https://doi.org/10.1007/s10800-016-1002-9

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  • DOI: https://doi.org/10.1007/s10800-016-1002-9

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