| Titre : |
Anticorrosive epoxy/clay nanocomposite coatings : rheological and protective properties |
| Type de document : |
texte imprimé |
| Auteurs : |
Milos D. Tomic, Auteur ; Branko Dunjic, Auteur ; Jelena B. Bajat, Auteur ; Violeta Likic, Auteur ; Jelena Rogan, Auteur ; Jasna Djonlagic, Auteur |
| Année de publication : |
2016 |
| Article en page(s) : |
p. 439-456 |
| Note générale : |
Bibliogr. |
| Langues : |
Américain (ame) |
| Catégories : |
Anticorrosifs
Anticorrosion
Argile
Cloisite
Dispersions et suspensions
Epoxydes
Nanoparticules
Rhéologie
|
| Index. décimale : |
667.9 Revêtements et enduits |
| Résumé : |
The preparation of epoxy/clay nanocomposites (NCs) and their insertion into coatings are of great importance since the NCs could enhance the protective performances. In this study, epoxy NCs with 1–10 wt% of nanoclay Cloisite 30B (C30B) were prepared by the sonication-assisted solution method. The rheological measurements of epoxy/C30B suspensions revealed non-Newtonian, shear-thinning behavior of the uncured NCs, with an increase in the viscosity, yield stress, and shear modules with increasing organoclay content, while the dispersion effectiveness of C30B decreased. A significant enhancement of the rheological parameters was observed at the second percolation threshold (4.1 vol%) due to the formation of a continuous network of 45-layer-thick tactoids. Although NCs with 1–3 wt% C30B exhibited slightly reduced mechanical and adhesion properties compared with the cured reference epoxy resin, the epoxy primer and topcoat based on NC with 1 wt% C30B generally displayed improved impact resistance and maintained flexibility, pendulum hardness, and good adhesion properties. Two-layer coating systems, i.e., NC-based primers and topcoats, had higher corrosion stability in a salt spray chamber compared to the unmodified system. |
| Note de contenu : |
- EXPERIMENTAL : Materials - Epoxy NCs preparation - Application of epoxy Ncs on steel substrates - Epoxy coatings preparation - Application of epoxy coatings on steel substrates - Sample characterization
- RESULTS AND DISCUSSION : Free swelling and rheological properties of the C30B/thinner dispersion - Rheological properties of the uncured epoxy Ncs - Structural characterization of cured epoxy Ncs - Adhesive and mechanical properties of epoxy NCs - Adhesive and mechanical properties of NC-based primer and topcoat - Anticorrosive properties of epoxy coatings |
| DOI : |
10.1007/s11998-015-9762-4 |
| En ligne : |
https://link.springer.com/content/pdf/10.1007%2Fs11998-015-9762-4.pdf |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=26285 |
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 13, N° 3 (05/2016) . - p. 439-456
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