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Published in: Journal of Coatings Technology and Research 3/2020

24-03-2020

Epoxy-based smart coating with self-repairing polyurea-formaldehyde microcapsules for anticorrosion protection of aluminum alloy AA2024

Authors: Chigoziri N. Njoku, Weichen Bai, Innocent O. Arukalam, Lihui Yang, Baorong Hou, Demian I. Njoku, Ying Li

Published in: Journal of Coatings Technology and Research | Issue 3/2020

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Abstract

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.

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Metadata
Title
Epoxy-based smart coating with self-repairing polyurea-formaldehyde microcapsules for anticorrosion protection of aluminum alloy AA2024
Authors
Chigoziri N. Njoku
Weichen Bai
Innocent O. Arukalam
Lihui Yang
Baorong Hou
Demian I. Njoku
Ying Li
Publication date
24-03-2020
Publisher
Springer US
Published in
Journal of Coatings Technology and Research / Issue 3/2020
Print ISSN: 1547-0091
Electronic ISSN: 1935-3804
DOI
https://doi.org/10.1007/s11998-020-00334-3

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