Corrosion performance of polypyrrole-bilayer coating on carbon steel

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dc.contributor.authorCho, Liu Yao
dc.contributor.authorGuiotti, Luciano Grande
dc.contributor.authorLiu, Andrea Santos
dc.date.accessioned2025-02-10T18:16:56Z
dc.date.available2025-02-10T18:16:56Z
dc.date.issued22023
dc.description.abstractPolypyrrole doped with phosphoric acid was electrochemically synthesized on carbon steel from acetonitrile medium, and then a coating of polypyrrole doped with a long carbon chain acid, dodecylbenzenesulfonic acid or lauric acid, was electrodeposited to form a bilayer. The more protective performance of the bilayers in relation to monolayers was explained in terms of adherence and low porous, as confirmed by scanning electron microscopy. The corrosion perfor- mance was also confirmed by electrochemical measurements of open-circuit potential, potentiodynamic polarization curves and electrochemical impedance spectroscopy in chloride solution. The polarization experiments indicated that the corrosion potential values for polypyrrole-bilayer-coated steel were shifted to the positive direction in relation to uncoated carbon steel, indicating anodic protection. Tafel plots also indicated that the anodic current densities were smaller for steel coated by polypyrrole-bilayer. In addition, the electrochemical impedance data showed that the charge transfer resistance values are associated with the resistance to electron exchange between the metal and the coating, and depend on the type of long carbon chain dopant used in the outer-layer. Thus, the suggested mechanism to explain the protection of carbon steel surfaces against corrosion was associated to the passivation and barrier effect of the polypyrrole-bilayer.
dc.description.physical16 p.
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.format.mimetypePDF
dc.identifier.affiliationUniversidade do Vale do Paraíba
dc.identifier.affiliationInstituto Federal de São Paulo
dc.identifier.bibliographicCitationCHO, Liu Yao; GUIOTTI, Luciano Grande; LIU, Andrea Santos. Corrosion performance of polypyrrole-bilayer coating on carbon steel. Journal of Materials Science, v. 58, n. 3, p. 1436-1451, 2023. Disponível em:
dc.identifier.doi10.1007/s10853-022-08094-8
dc.identifier.urihttps://repositorio.univap.br/handle/123456789/563
dc.language.isoen_US
dc.publisherSpringer Nature
dc.rights.holderSpringer
dc.subject.keywordCorrosion
dc.subject.keywordPolypyrrole-bilayer
dc.subject.keywordCarbon steel
dc.titleCorrosion performance of polypyrrole-bilayer coating on carbon steel
dc.typeArtigos de Periódicos

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