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Towards weathering and corrosion resistant, self-warning and self-healing epoxy coatings with tannic acid loaded nanocontainers

Journal Article (2023)
Author(s)

Jinke Wang (University of Science and Technology Beijing)

Weimin Tan (Changzhou Paint and Coatings Industry Research Institute Limited Liability Company)

Hao Yang (University of Science and Technology Beijing)

Xingxing Rao (Changzhou Paint and Coatings Industry Research Institute Limited Liability Company)

Xinliang Luo (Changzhou Paint and Coatings Industry Research Institute Limited Liability Company)

Lingwei Ma (University of Science and Technology Beijing)

Chenhao Ren (University of Science and Technology Beijing)

Arjan Mol (TU Delft - Team Arjan Mol)

Dawei Zhang (University of Science and Technology Beijing)

Research Group
Team Arjan Mol
DOI related publication
https://doi.org/10.1038/s41529-023-00360-7
More Info
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Publication Year
2023
Language
English
Research Group
Team Arjan Mol
Issue number
1
Volume number
7
Article number
39
Downloads counter
285
Collections
Institutional Repository
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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.