Comparative study of polypyrrole films electrosynthesized on zinc surfaces from organic and aqueous solutions

• Autor(a) principal: Martins,J. I.
• Data de Publicação: 2015
• Outros Autores: Bazzaoui,M.
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
• Texto Completo: http://scielo.pt/scielo.php?script=sci_arttext&pid=S0870-11642015000100001
• topic: Polypyrrole; Conducting Polymers; Tartrate; Electropolymerization; Zinc Corrosion

Homogeneous and adherent polypyrrole coatings have been achieved on zinc electrodes previously treated with an aqueous solution of sulfide in the acetonitrile medium with tetraethylammonium p-toluene sulfonate, and in the tartrate aqueous medium without any chemical or electrochemical pretreatment of the working electrode. The XPS and AES analysis showed that the dissolution of the working electrodes is inhibited in the first polarization medium by the oxide and zinc sulfide formed on the surface during the pretreatment in 0.2 M Na2S after 12 h, or by the zinc tartrate film developed through the electrode polarization in the second. The adherence, compactness and corrosion performance in 0.1 M HCl of the polypyrrole coatings from the tartrate solution are higher than those obtained from acetonitrile medium.