Poly( o-toluidine) coatings on copper: Electrochemical synthesis from aqueous media

Poly( o-toluidine) (POT) coatings were synthesized on copper (Cu) by electrochemical polymerization of o-toluidine using aqueous sodium oxalate solution as supporting electrolyte. The resulting coatings were uniform, compact and strongly adherent to the Cu substrate. These coatings were characterize...

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Bibliographic Details
Published in:Surface & coatings technology 2006-04, Vol.200 (16), p.5094-5101
Main Authors: Shinde, Vandana, Mandale, A.B., Patil, K.R., Gaikwad, A.B., Patil, P.P.
Format: Article
Language:English
Subjects:
Applied sciences
Conducting polymer coatings
Copper
Corrosion
Corrosion environments
Corrosion prevention
Corrosion resistant coatings
Cross-disciplinary physics: materials science
rheology
Cyclic voltammetry
Exact sciences and technology
Materials science
Metals. Metallurgy
Nonmetallic coatings
Other topics in materials science
Physics
Poly( o-toluidine) coatings
Production techniques
Surface treatment
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Summary:Poly( o-toluidine) (POT) coatings were synthesized on copper (Cu) by electrochemical polymerization of o-toluidine using aqueous sodium oxalate solution as supporting electrolyte. The resulting coatings were uniform, compact and strongly adherent to the Cu substrate. These coatings were characterized by using cyclic voltammetry, UV-visible absorption spectroscopy, Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), X-ray diffraction (XRD) measurements and X-ray photoelectron spectroscopy (XPS). The results of these studies reveal that the sodium oxalate is suitable supporting electrolyte for the electrochemical polymerization of o-toluidine on Cu substrate. It is found that the electrochemical polymerization of o-toluidine takes place after the passivation of the Cu substrate via formation of copper oxalate (CuC 2O 4, H 2O) layer, which is confirmed by XRD and XPS. The optical absorption spectroscopy study reveals the exclusive formation of the pernigraniline base (PB) form of POT.
ISSN:0257-8972
1879-3347
DOI:10.1016/j.surfcoat.2005.05.026