Identificador persistente para citar o vincular este elemento: http://hdl.handle.net/10553/74020
Título: Influence of deposition technique on the protective properties of epoxy films
Autores/as: Drob, P.
Vasilescu, E.
Popa, M. V.
Anghel, M.
Santana López, Agustín 
Clasificación UNESCO: 3313 Tecnología e ingeniería mecánicas
Palabras clave: Impedance Spectroscopy
Electrochemical Impedance
Coatings
Corrosion
Metals, et al.
Fecha de publicación: 2000
Publicación seriada: Materials and Corrosion - Werkstoffe und Korrosion 
Resumen: The electrochemical impedance spectra, the anodic polarization curves and the time dependence of paint capacitance and paint resistance have been used in this paper to evaluate the protective properties of epoxy films on carbon steel substrate. The coatings were formed using four deposition techniques (brushing, immersion, cathodic and anodic electrodeposition) with the aim to determine the effect of deposition type on the anticorrosive performances of epoxy paint. Interpretation of Nyquist and Bode impedance spectra with the immitance analysis Equivert. programme has established an electrical equivalent circuit with two time constants fitted to describe the electrodeposited epoxy/carbon steel system in the 3 % sodium chloride solution and an electrical equivalent circuit with four time constants fitted in case of epoxy films applied by brush or immersion. The anodic polarisation measurements show nobler corrosion potentials and smaller dissolution current densities for the carbon steel in the presence of the electrodeposited films in comparison with epoxy coatings applied by brush or with the immersion technique. The values of the porosity, water uptake. and ionic transport through the film emphasize the higher performances of the electrodeposited films, characterized by uniformity, porosity absence, low water permeability and few conductive pathways.
URI: http://hdl.handle.net/10553/74020
ISSN: 0947-5117
DOI: 10.1002/1521-4176(200007)51:7<486::AID-MACO486>3.0.CO;2-X
Fuente: Materials and Corrosion - Werkstoffe und Korrosion [ISSN 0947-5117], v. 51 (7), p. 486-490, (Julio 2000)
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