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- Title
Towards weathering and corrosion resistant, self-warning and self-healing epoxy coatings with tannic acid loaded nanocontainers.
- Authors
Wang, Jinke; Tan, Weimin; Yang, Hao; Rao, Xingxing; Luo, Xinliang; Ma, Lingwei; Ren, Chenhao; Mol, Arjan; Zhang, Dawei
- Abstract
In this work, an active protective epoxy coating with weathering resistant, corrosion-warning, and self-healing properties was developed by incorporating tannic acid (TA) loaded mesoporous silica (MSN-TA) nanocontainers. The introduction of MSN-TA nanocontainers could alleviate the coating degradation via scavenging the radicals generated during UV irradiation. Compared with the blank coating, the coating containing 5 wt.% MSN-TA nanocontainers exhibited much less degradation in surface morphology, wettability and glossiness, and maintained a good barrier property after 384 h of accelerated weathering. Once the coating was damaged, the released TA could react with the Fe3+ ions to form a chelate that endowed the coating scratch with a visible black coloration, i.e. triggering a self-warning capability to indicate the initial onset of corrosion. In addition, the generated chelate could inhibit extensive corrosion propagation, offering a significant self-healing effect demonstrated by the stabilized impedance modulus values during 28 days of immersion in NaCl solution.
- Subjects
TANNINS; PROTECTIVE coatings; EPOXY coatings; MESOPOROUS silica; SURFACE morphology; WEATHERING; WETTING
- Publication
NPJ Materials Degradation, 2023, Vol 7, Issue 1, p1
- ISSN
2397-2106
- Publication type
Article
- DOI
10.1038/s41529-023-00360-7