| Titre : |
Characterization of a water-based paint for corrosion protection |
| Type de document : |
texte imprimé |
| Auteurs : |
Paula Dias, Auteur ; Catarina Carneiro, Auteur ; LuÃsa Andrade, Auteur ; José Sousa, Auteur ; João Machado, Auteur ; Adélio Mendes, Auteur |
| Année de publication : |
2012 |
| Article en page(s) : |
p. 365-374 |
| Note générale : |
Bibliogr. |
| Langues : |
Américain (ame) |
| Catégories : |
Anticorrosifs
Anticorrosion
Caractérisation
Chlorures
Ions
Matériaux cimentaires -- Revêtements protecteurs
Perméabilité
Revêtements en phase aqueuse -- Séchage:Peinture en phase aqueuse -- Séchage
|
| Index. décimale : |
667.9 Revêtements et enduits |
| Résumé : |
Corrosion of steel rebars in reinforced concrete is one of the major problems in the construction industry. Carbonation reactions of concrete with carbon dioxide and, mainly, the chloride salts action are the main causes responsible for concrete degradation. Protective coatings help to improve the durability of concrete structures by acting as a physical barrier against the corrosion agents. Waterborne paints are usually used for concrete protection rather than solvent-based paints since they are less pollutant. The aim of this work is to investigate the influence of the pore size and porosity on the permeability of the paints films toward sodium chloride. Three characterization methods from membrane science were implemented to characterize paint coatings. The time-lag method was used to determine the permeability toward the sodium chloride and toward helium and argon, these for approximately 100% relative humidity. From the seven waterborne paints formulated, only one was found to be suitable for surface protection of reinforced concrete, since its permeability toward NaCl was smaller than 10−14 m2 s−1, the threshold value required by National Laboratory of Civil Engineering (LNEC) in Portugal. For the formulated paints, it was observed that the average pore size correlates well with the permeability toward sodium chloride. This is an important result since obtaining the permeability toward sodium chloride of corrosion protective paints is very time consuming, while the average pore size can be obtained in a much shorter time. |
| Note de contenu : |
- EXPERIMENTAL SECTION : Coatings preparation - Application of coatings - Time-lag method : determination of paint films permeability toward chloride salts - Time-lag method : determination of paint films permeability toward gases - Helium picnometry - Mercury porosimetry
- RESULTS AND DISCUSSION : Time-lag method - Determination of paint films permeability toward chloride salts - Determination of paint films permeability toward gases - Helium picnometry and mercury porosimetry methods : internal porosimetry determination |
| DOI : |
10.1007/s11998-011-9388-0 |
| En ligne : |
https://link.springer.com/content/pdf/10.1007%2Fs11998-011-9388-0.pdf |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15967 |
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 9, N° 3 (05/2012) . - p. 365-374
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