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Electron conducting organic coating of mild steel by electropolymerization

Abstract

The aim was to coat mild steel with an electron conducting polymer in order to replace any possible electrochemical corrosion of the metal by another electrochemical reaction occurring on top of the film. In view of potential industrialization, electropolymerization of a water soluble monomer was studied. In most cases, this was achieved by oxidation, and the substrate had to be passivated. Polyaniline, was obtained in nitric acid solution. Films had a good structure but were brittle and powdery on the surface. Except on tin free steel, they were insulating. Polypyrrole was a better candidate. Prepared from a Na2SO4 solution, films were conductive, ensured good corrosion resistance of the substrate but they were brittle and adhesion to the substrate was not high. Furance, thiophene and iron substituted vinylpyridine complex were tried without success. Further, research should consider copolymerization of pyrrole with other monomers.

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Troch-Nagels, G., Winand, R., Weymeersch, A. et al. Electron conducting organic coating of mild steel by electropolymerization. J Appl Electrochem 22, 756–764 (1992). https://doi.org/10.1007/BF01027506

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  • DOI: https://doi.org/10.1007/BF01027506

Keywords

  • Corrosion Resistance
  • Polyaniline
  • Mild Steel
  • Pyrrole
  • Copolymerization