SECM investigation of electrochemically synthesized polypyrrole from aqueous medium

A. El Jaouhari, D. Filotás, A. Kiss, M. Laabd, E. A. Bazzaoui, L. Nagy, G. Nagy, A. Albourine, J. I. Martins, R. Wang, M. Bazzaoui

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Abstract

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. Graphical Abstract: [Figure not available: see fulltext.]

Original languageEnglish
Pages (from-to)1199-1209
Number of pages11
JournalJournal of Applied Electrochemistry
Volume46
Issue number12
DOIs
Publication statusPublished - Dec 1 2016

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Keywords

  • Aqueous medium
  • Carbon steel
  • Corrosion
  • Electropolymerization
  • Polypyrrole
  • SECM

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Materials Chemistry
  • Electrochemistry

Cite this

El Jaouhari, A., Filotás, D., Kiss, A., Laabd, M., Bazzaoui, E. A., Nagy, L., Nagy, G., Albourine, A., Martins, J. I., Wang, R., & Bazzaoui, M. (2016). SECM investigation of electrochemically synthesized polypyrrole from aqueous medium. Journal of Applied Electrochemistry, 46(12), 1199-1209. https://doi.org/10.1007/s10800-016-1002-9