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

Yao Huang, Leping Deng, Pengfei Ju, Luyao Huang, Hongchang Qian, Dawei Zhang*, Xiaogang Li, Herman A. Terryn, Johannes M.C. Mol

*Corresponding author for this work

    Research output: Contribution to journalArticleScientificpeer-review

    80 Citations (Scopus)
    44 Downloads (Pure)

    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.

    Original languageEnglish
    Pages (from-to)23369-23379
    JournalACS Applied Materials and Interfaces
    Volume10
    Issue number27
    DOIs
    Publication statusPublished - 2018

    Keywords

    • corrosion
    • corrosion inhibitor
    • self-healing coating
    • shape memory polymer
    • smart materials

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