| Titre : |
Diffusion cell investigations into the acidic degradation of organic coatings |
| Type de document : |
texte imprimé |
| Auteurs : |
Victor Buhl Møller, Auteur ; Ting Wang, Auteur ; Kim Dam-Johansen, Auteur ; Sarah Maria Frankaer, Auteur ; Søren Kiil, Auteur |
| Année de publication : |
2018 |
| Article en page(s) : |
1201-1215 |
| Note générale : |
Bibliogr. |
| Langues : |
Américain (ame) |
| Catégories : |
Acidité
Coefficient de diffusionUn coefficient de diffusion est une grandeur caractéristique du phénomène de diffusion de la matière. Le coefficient de diffusion mesure le rapport entre le flux molaire dû à la diffusion moléculaire, et le gradient de concentration de l'espèce chimique considérée (ou, plus généralement, de la variable d'effort entraînant cette diffusion), comme formulé par la loi de Fick.
Copolymère vinyle ester
Matériaux -- Propriétés barrières
Modèles mathématiques
Perméation
Polyuréthanes
Revêtements organiques
Revêtements protecteurs -- Détérioration
|
| Index. décimale : |
667.9 Revêtements et enduits |
| Résumé : |
Protective organic coatings work by preventing contact between an aggressive environment and a vulnerable substrate. However, the long required lifetime of a barrier coating provides a challenge when attempting to evaluate coating performance. Diffusion cells can be used as a tool to estimate coating barrier properties and lifetime. In this work, a diffusion cell array was designed, constructed, and compared to previous designs, with simplicity being the most important design parameter. Sulfuric acid diffusion through five different coatings was monitored using a battery of cells, and a mathematical model was developed to simulate the experimental data and to study diffusion mechanisms. The diffusion cells allowed an objective and fast analysis of coating barrier properties. It was found that sulfuric acid deteriorated these properties as it diffused through the films. This was also expressed in the modeling results, where a three-step time dependency of the diffusion coefficient was required to simulate both acid breakthrough time and the subsequent steady-state flux. A vinyl ester-based coating proved to be the most effective barrier to sulfuric acid diffusion, followed by a polyurethane coating. Amine-cured novolac epoxies provided the least effective protection. |
| Note de contenu : |
- PREVIOUS DIFFUSION CELL DESIGN
- NEW DIFFUSION CELL DESIGN
- DIFFUSION CELL DETAILS
- EXPERIMENTAL CONDITIONS
- EXPERIMENTAL PROCEDURE
- COATINGS INVESTIGATED
- MATHEMATICAL MODELING : Mass balance - Estimation of model parameters
- EXPERIMENTAL RESULTS : Preliminary conditions - Harsh conditions
- MATHEMATICAL MODELING OF DIFFUSION DATA : Using constant diffusion coefficients - Using concentration and time-dependent diffusion coefficients
- DISCUSSION : Coating barrier properties - Coating performance and lifetime estimation - Coating degradation and diffusion mechanisms - Water saturation effects - Combined cell mechanism
- VALIDATION OF MODEL ASSUMPTIONS |
| DOI : |
10.1007/s11998-018-0094-z |
| En ligne : |
https://link.springer.com/content/pdf/10.1007%2Fs11998-018-0094-z.pdf |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31331 |
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 15, N° 6 (11/2018) . - 1201-1215
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Diffusion cell investigations into the acidic degradation of organic coatings in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 15, N° 6 (11/2018)
