| Titre : |
Epoxy-based smart coating with self-repairing polyurea-formaldehyde microcapsules for anticorrosion protection of aluminum alloy AA2024 |
| Type de document : |
texte imprimé |
| Auteurs : |
Chigoziri N. Njoku, Auteur ; Weichen Bai, Auteur ; Innocent O. Arukalam, Auteur ; Lihui Yang, Auteur ; Baorong Hou, Auteur ; Demian I. Njoku, Auteur ; Li Ying, Auteur |
| Année de publication : |
2020 |
| Article en page(s) : |
p. 797–813 |
| Note générale : |
Bibliogr. |
| Langues : |
Américain (ame) |
| Catégories : |
Aluminium -- Alliages
Anticorrosifs
Anticorrosion
Copolymère urée formaldéhyde
Epoxydes
Métaux -- Revêtements protecteurs
Microcapsules
Revêtement autoréparant
Revêtement autoréparant:Peinture autoréparante
Revêtements organiques
|
| Index. décimale : |
667.9 Revêtements et enduits |
| Résumé : |
Self-reparable microcapsules which can repair microcracks in the coating matrix and effectively inhibit the corrosion at the substrate/coating interface during service have been evaluated. The main objective was to fabricate an innovative pH-responsive permeability-switching polyurea-formaldehyde (PUF)-based microcapsule laden with 8-hydroxyquinoline (8-HQ) as the core material for the production of smart epoxy coating for the long-term protection of Al alloys. Combined improved barrier, active, and self-repairing properties indicating sort of triple-action corrosion mitigating ability of the modified epoxy-based smart coating was demonstrated by electrochemical impedance spectroscopy and scanning electron microscopy. The results indicate that the self-repairing action occurs via two mechanisms: firstly, by the initiation of chain mobility at the modified coating defects on heat treatment. Secondly, by the crosslinking of the swelled hydrogel present in the PUF shell wall via the various polymer–polymer interactions. The active corrosion protection was due to the (smart) pH response–release ability of the encapsulated inhibitor (8-HQ) with an increase in corrosion degree. Meanwhile, the even dispersal of the fabricated microcapsule with its intrinsic rough surface in the epoxy coating matrix contributed to the improved barrier and adhesive properties. |
| Note de contenu : |
- MATERIALS AND METHODS : Materials - Methods
- RESULTS AND DISCUSSION : Microcapsule morphology - Loading amount of 8-HQ in PUF microcapsules - Chemical content of the microcapsule - Release profiles of loaded inhibitor - Barrier properties of the unscratched coating - Evaluation of the combined active and self-repairing ability of the coating - Physical performance assessments |
| DOI : |
https://doi.org/10.1007/s11998-020-00334-3 |
| En ligne : |
https://link.springer.com/content/pdf/10.1007/s11998-020-00334-3.pdf |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34109 |
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 17, N° 3 (05-06/2020) . - p. 797–813
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