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Synergistic effect of graphene oxide@phosphate-intercalated hydrotalcite for improved anti-corrosion and self-healable protection of waterborne epoxy coating in salt environments

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Abstract

Waterborne epoxy coatings (WECs), with significant anti-corrosion and self-healable performance, effectively inhibit the corrosion of the metal surface in salt environments and are highly desirable; however, it is still a challenge to achieve them; herein, we have demonstrated graphene oxide (GO) and phosphate (PO43−)-intercalated hydrotalcite (PIH) formed via electrostatic self-assembly to overcome this problem. The corrosion protective properties were characterized by an electrochemical experiment and a salt spray test. Due to the synergistic effect of the strong barrier performance of GO plus hydrotalcite, good dispersion of PIH enabled by GO, and the formation of a phosphate film at the metal/coating interface owing to sustainable ion-exchange between Cl and PO43−, the GO@PIH-based WECs exhibit superior anti-corrosion ability. By comparison, the failure time of the GO@PIH-based WECs was significantly prolonged to 30 days when compared with that of GO/WECs (15 days) and PIH/WECs (7 days). Interestingly, the GO@PIH/WECs also exhibit self-healing performance when the corrosive ions reach the metal/coating interface; this is attributed to PO43− released from the PIH nanoplates; hence, the failure time of the GO@PIH/WECs is further prolonged.

Graphical abstract: Synergistic effect of graphene oxide@phosphate-intercalated hydrotalcite for improved anti-corrosion and self-healable protection of waterborne epoxy coating in salt environments

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Publication details

The article was received on 23 Dec 2018, accepted on 18 Jan 2019 and first published on 22 Jan 2019


Article type: Paper
DOI: 10.1039/C8TC06487C
Citation: J. Mater. Chem. C, 2019, Advance Article

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    Synergistic effect of graphene oxide@phosphate-intercalated hydrotalcite for improved anti-corrosion and self-healable protection of waterborne epoxy coating in salt environments

    C. Chen, Y. He, G. Xiao, F. Zhong, H. Li, Y. Wu and J. Chen, J. Mater. Chem. C, 2019, Advance Article , DOI: 10.1039/C8TC06487C

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