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ACS Applied Materials & Interfaces

ACS Applied Materials & Interfaces

IF: 8.3
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Dynamic Polymer/Metal–Organic Framework Hybrid Microcapsules for Self-Healing Anticorrosion Coatings

Published:2 December 2024 DOI: 10.1021/acsami.4c16670
Yan Song, Xuhui Wang, Junjie Tang, Guo Liang Li

Abstract

An ideal microcapsule effectively preserves an active substance and can rapidly release it to elicit a self-healing anticorrosion effect. However, the development of highly efficient microcapsules remains a challenge. In this study, polymer/metal–organic framework hybrid microcapsules with dynamic properties were constructed as self-healing anticorrosion coatings. The shell of the microcapsule consisted of flexible polydopamine and a hard crystalline zeolitic imidazolate framework-8 (ZIF-8) layer. The corrosion inhibitor 8-hydroxyquinoline (8-HQ) was trapped in the microcapsules and remained unreleased because the ZIF-8 layer acted as a molecular sieve. When the coating was surrounded by an acidic environment, the ZIF-8 nanocrystals in the shell dissociated, followed by the release of 8-HQ. A dense protective layer was formed on the steel surface to suppress extensive corrosion propagation. The |Z|0.01Hz value of the self-healing coating increased from 1.9 × 104 Ω cm2 to 2.2 × 106 Ω cm2 within 48 h and remained at this level until 120 h post application. This value is 3 orders of magnitude higher than that of a pure epoxy coating under the same conditions. Compared with conventional coatings, the novel dynamic microcapsules enable the application of self-healing coatings that can withstand harsh acidic environments without human intervention.

Substances (5)

Materials
Procduct Name CAS Molecular Formula Supplier Price
Tris(hydroxymethyl)aminomethane 77-86-1 C4H11NO3 1138 suppliers $5.00-$8920.00
8-Hydroxyquinoline 148-24-3 C9H7NO 975 suppliers $5.00-$2100.00
2-Methylimidazole 693-98-1 C4H6N2 862 suppliers $10.00-$610.00
Methanol 67-56-1 CH4O 833 suppliers $9.00-$7620.00
Ethanol 64-17-5 C2H6O 806 suppliers $10.00-$17310.00

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