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Triple-action self-healing protective coatings based on shape memory polymers containing dual-function microspheres

Journal Article (2018)
Author(s)

Yao Huang (University of Science and Technology Beijing)

Leping Deng (University of Science and Technology Beijing)

Pengfei Ju (Shanghai Aerospace Equipment Manufacturer)

Luyao Huang (University of Science and Technology Beijing)

Hongchang Qian (University of Science and Technology Beijing)

Dawei Zhang (University of Science and Technology Beijing)

Xiaogang Li (University of Science and Technology Beijing)

Herman A. Terryn (Vrije Universiteit Brussel, TU Delft - (OLD) MSE-6)

Johannes M.C. Mol (TU Delft - (OLD) MSE-6)

Research Group
(OLD) MSE-6
DOI related publication
https://doi.org/10.1021/acsami.8b06985
More Info
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Publication Year
2018
Language
English
Research Group
(OLD) MSE-6
Issue number
27
Volume number
10
Pages (from-to)
23369-23379
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Abstract

In this study, a new self-healing shape memory polymer (SMP) coating was prepared to protect the aluminum alloy 2024-T3 from corrosion by the incorporation of dual-function microspheres containing polycaprolactone and the corrosion inhibitor 8-hydroxyquinoline (8HQ). The self-healing properties of the coatings were investigated via scanning electron microscopy, electrochemical impedance spectroscopy, and scanning electrochemical microscopy following the application of different healing conditions. The results demonstrated that the coating possessed a triple-Action self-healing ability enabled by the cooperation of the 8HQ inhibitor, the SMP coating matrix, and the melted microspheres. The coating released 8HQ in a pH-dependent fashion and immediately suppressed corrosion within the coating scratch. After heat treatment, the scratched coating exhibited excellent recovery of its anticorrosion performance, which was attributed to the simultaneous initiation of scratch closure by the shape memory effect of the coating matrix, sealing of the scratch by the melted microspheres, and the synergistic effect of corrosion inhibition by 8HQ.