[article]
| Titre : |
Dependence of dirt resistance of steel topcoats on their surface characteristics |
| Type de document : |
texte imprimé |
| Auteurs : |
Sainan Li, Auteur ; Guangxin Gu, Auteur ; Shuxue Zhou, Auteur ; Limin Wu, Auteur |
| Année de publication : |
2013 |
| Note générale : |
Bibliogr. |
| Langues : |
Américain (ame) |
| Catégories : |
Acier L'acier est un alliage métallique utilisé dans les domaines de la construction métallique et de la construction mécanique.
L'acier est constitué d'au moins deux éléments, le fer, très majoritaire, et le carbone, dans des proportions comprises entre 0,02 % et 2 % en masse1.
C'est essentiellement la teneur en carbone qui confère à l'alliage les propriétés du métal qu'on appelle "acier". Il existe d’autres métaux à base de fer qui ne sont pas des aciers comme les fontes et les ferronickels par exemple.
Angle de contact
Hydrophilie
Mouillabilité
Polyfluorure de vinylidène
Résistance à la salissure
Revêtement auto-nettoyant:Peinture auto-nettoyante
Revêtements -- Finition:Peinture -- Finition
|
| Index. décimale : |
667.9 Revêtements et enduits |
| Résumé : |
Contamination of exterior coatings with dirt is a significant problem in seriously polluted environments. To correlate the dirt resistance of exterior coatings with surface characteristics (wettability, roughness, and composition), steel topcoats were evaluated using both dirt pick-up tests according to a national standard testing method of China (GB/T 9757-2001) and outdoor exposure experiments in Shanghai, China. These topcoats included polyvinylidene fluoride (PVDF) paints with various water contact angles (WCAs), polyurethane (PU) paint, polysiloxane (PSiO) paint, and 2K fluorocarbon (FPU) paint. Opposite dirt resistance results were obtained from these two dirt pick-up methods. In the outdoor exposure experiments, superhydrophilic PVDF paints showed excellent self-cleaning performance and thus superior dirt resistance. Superhydrophobic PVDF paint exhibited self-cleaning performance initially, but became dirty finally due to a piling up of PM2.5 pollutants. PVDF paints with WCAs of 85°–125°, PU, PSiO, and FPU paints all exhibited poor dirt resistance in the outdoor environment. These results indicate that dirt resistance depends on surface wettability and the characteristics of pollutants rather than on the surface roughness and composition. |
| Note de contenu : |
- EXPERIMENTAL : Preparation of coating panels - Dirt pick-up test in lab - outdoor exposure experiments - Characterization
- RESULTS AND DISCUSSION : The surface characteristics of steel topcoats - Dirt resistance test - Outdoor exposure experiment - Effect of surface wettability - Effect of the type of steel topcoats |
| DOI : |
10.1007/s11998-012-9462-2 |
| En ligne : |
https://link.springer.com/content/pdf/10.1007%2Fs11998-012-9462-2.pdf |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18733 |
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 10, N° 3 (05/2013)
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Dependence of dirt resistance of steel topcoats on their surface characteristics in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 10, N° 3 (05/2013)
