Journal
JOURNAL OF MATERIALS CHEMISTRY C
Volume 7, Issue 8, Pages 2318-2326Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8tc06487c
Keywords
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Funding
- National Natural Science Foundation of China [51774245]
- Sichuan Province sci-tech [2015RZ0023]
- Youth science and technology creative group fund of Southwest Petroleum University [2015 CXTD03]
- Applied Basic Research Program of Science and Technology, Department of Sichuan Province [2018JY0517]
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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.
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