Characterization of a water-based paint for corrosion protection / Paula Dias in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 9, N° 3 (05/2012)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 9, N° 3 (05/2012) . - p. 365-374 Titre : Characterization of a water-based paint for corrosion protection Type de document : texte imprimé Auteurs : Paula Dias, Auteur ; Catarina Carneiro, Auteur ; Luísa 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 [article]

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