Coupled effect of water absorption and ion transport in hydrated latex anti-corrosion coatings / Yu Ren Zhou in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 1 (01/2023)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 20, N° 1 (01/2023) . - p. 187-200 Titre : Coupled effect of water absorption and ion transport in hydrated latex anti-corrosion coatings Type de document : texte imprimé Auteurs : Yu Ren Zhou, Auteur ; Surya Effendy, Auteur ; Juner Zhu, Auteur ; Michael T. Petr, Auteur ; Colin Cwalina, Auteur ; Martin Z. Bazant, Auteur ; Bilge Yildiz, Auteur ; Ju Li, Auteur ; Michael P. Short, Auteur Année de publication : 2023 Article en page(s) : p. 187-200 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Anticorrosion Gonflement (physique) Humidité -- Absorption:Eau -- Absorption Latex Revêtements en phase aqueuse Revêtements organiques Revêtements protecteurs Transports d'ions Index. décimale : 667.9 Revêtements et enduits Résumé : Water-based anti-corrosion coatings, which are environmentally-friendly replacements for organic solvent-based coatings, do not perform well enough for use in the most challenging corrosion environments. The high water absorption capacity of water-based latex films may reduce barrier performance by contributing to corrosive reactant/product transport. We seek to understand the coupled effects of water absorption and ion transport in hydrated latex films, and to propose mechanisms explaining these effects. Water absorption and ion transport in films immersed in deionized (DI) water were monitored by mass gain and electrical conductivity measurements, respectively. Despite very similar polymer compositions between films, large differences in water absorption and ion transport rates were observed and explained by percolating networks at latex particle boundaries which facilitate transport. A semi-continuum model with three-component diffusion and convection-like elastic relaxation supported the assumptions of the physical mechanisms governing water absorption and ion transport. The evidence of the coupled processes of water absorption and ion transport in hydrated latex films revealed in this study are useful for designing water-based coatings that provide high levels of corrosion resistance. Note de contenu : - METHODOLOGY : Paint composition - Water absorption - Leached ion transport - Cross-section scanning electron microscopy (SEM) - Structural and chemical characterization - RESULTS AND DISCUSSION : SAXS and FTIR results - Water entry mechanism into latex films - Effect of water absorption on ion leaching -Semi-continuum model - Model fitting procedure - Model output and results - Comparison of model and experiment - Model validation - Table 1 : List of boundary conditions at the plane of symmetry and at the film/water interface - Table 2 : List of known and fitted parameter values for SF-NP and SF-TiO2 - Table 3 : Validation data set is obtained by mass balance, assuming sodium chloride mobile ions and di(propylene glycol) n-butyl ether coalescent DOI : https://doi.org/10.1007/s11998-022-00676-0 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00676-0.pdf?pdf=button Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38835 [article]

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