Characterization and Corrosion Resistence of Galvanized Steel//Passivation Compositive/Polyuethane Paint Systems

The corrosion performance of electrogalvanised steel sheets pre-treated with a Cr3+ or Cr+6-based conversion layer and then covered with polyurethane-waterborne topcoat paint has been studied. The pre-treated metallic panels were coated with one of the three tested polyurethane (PU) topcoat paints,...

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Autores principales: Di Sarli, Alejandro Ramón, Elsner, Cecilia Inés, Tomachuk, C. R.
Formato: Articulo
Lenguaje:Inglés
Publicado: 2014
Materias:
Ingeniería
Passivating
Trivalent chromium
Electrogalvanised steel
Organic coating
Impedance spectroscopy
Corrosión
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/81351
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-81351
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ingeniería
Passivating
Trivalent chromium
Electrogalvanised steel
Organic coating
Impedance spectroscopy
Corrosión
spellingShingle Ingeniería
Passivating
Trivalent chromium
Electrogalvanised steel
Organic coating
Impedance spectroscopy
Corrosión
Di Sarli, Alejandro Ramón
Elsner, Cecilia Inés
Tomachuk, C. R.
Characterization and Corrosion Resistence of Galvanized Steel//Passivation Compositive/Polyuethane Paint Systems
topic_facet Ingeniería
Passivating
Trivalent chromium
Electrogalvanised steel
Organic coating
Impedance spectroscopy
Corrosión
description The corrosion performance of electrogalvanised steel sheets pre-treated with a Cr3+ or Cr+6-based conversion layer and then covered with polyurethane-waterborne topcoat paint has been studied. The pre-treated metallic panels were coated with one of the three tested polyurethane (PU) topcoat paints, in which the dispersion type was the formulation variable. The pigment was TiO2 (rutile) with a PVC value of 10. Before and after the immersion in 0.05 M NaCl (pH 5.70) or 0.1 M Na2SO4 (pH 6.36) solutions, replicates of the different samples were subjected to standardized tests (porosity, gloss and color, hardness, flexibility). During the immersion, blistering and rusting degrees were evaluated through periodical visual inspections, while the coated steel performance was monitored by Electrochemical Impedance Spectroscopy (EIS) measurements. Initial (dry) and final (wet) paint adhesion was also determined. EIS data were interpreted and discussed in terms of the time dependence of the electrical (paint coating) and electrochemical (steel substrate) parameters associated with interfacial processes describing the metal/paint system deterioration. According to the electrochemical properties, visual inspection a standardized tests results, it was concluded that the studied polyurethane-based polymeric films applied on pretreated electrogalvanised steel provided a very effective protection against corrosion as a result of their excellent barrier properties.
format Articulo
Articulo
author Di Sarli, Alejandro Ramón
Elsner, Cecilia Inés
Tomachuk, C. R.
author_facet Di Sarli, Alejandro Ramón
Elsner, Cecilia Inés
Tomachuk, C. R.
author_sort Di Sarli, Alejandro Ramón
title Characterization and Corrosion Resistence of Galvanized Steel//Passivation Compositive/Polyuethane Paint Systems
title_short Characterization and Corrosion Resistence of Galvanized Steel//Passivation Compositive/Polyuethane Paint Systems
title_full Characterization and Corrosion Resistence of Galvanized Steel//Passivation Compositive/Polyuethane Paint Systems
title_fullStr Characterization and Corrosion Resistence of Galvanized Steel//Passivation Compositive/Polyuethane Paint Systems
title_full_unstemmed Characterization and Corrosion Resistence of Galvanized Steel//Passivation Compositive/Polyuethane Paint Systems
title_sort characterization and corrosion resistence of galvanized steel//passivation compositive/polyuethane paint systems
publishDate 2014
url http://sedici.unlp.edu.ar/handle/10915/81351
work_keys_str_mv AT disarlialejandroramon characterizationandcorrosionresistenceofgalvanizedsteelpassivationcompositivepolyuethanepaintsystems
AT elsnerceciliaines characterizationandcorrosionresistenceofgalvanizedsteelpassivationcompositivepolyuethanepaintsystems
AT tomachukcr characterizationandcorrosionresistenceofgalvanizedsteelpassivationcompositivepolyuethanepaintsystems
bdutipo_str Repositorios
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