Study on self-healing and corrosion resistance behaviors of functionalized carbon dot-intercalated graphene-based waterborne epoxy coating

doi:10.1016/j.jmst.2020.06.023

Abstract

Abstract:

Functionalized carbon dots (CDs) obtained from citric acid derivative were selected as intercalator to modify graphene and then dispersed into epoxy matrix to prepare CDs modified graphene/epoxy (CDs-G/EP) coatings. Meanwhile, their microstructure, self-healing and corrosion resistance behaviors were analyzed deeply. Structural characterizations indicated the formation of “π-π” interaction between functionalized carbon dots and graphene. By observation, the dispersion and interface compatibility of graphene were greatly enhanced by CDs. The change rules of electrochemistry results implied that the addition of 0.5 wt.% CDs-G in EP coating (CDs-G0.5 %/EP) demonstrated a superior protective property on steel, which was attributed to the physical barrier of highly dispersed graphene and the self-healing ability of CDs. After 50 days immersion, the oxygen permeability coefficient and water absorption of CDs-G0.5 %/EP coating were only 4.27 × 10 ^-13 cm ³ cm cm ^-2 s ^-1 Pa ^-1 and 4.4 %, respectively.

Key words: Functionalized carbon dots, Corrosion, Graphene, Self-healing

Yuwei Ye, Hao Chen, Yangjun Zou, Haichao Zhao. Study on self-healing and corrosion resistance behaviors of functionalized carbon dot-intercalated graphene-based waterborne epoxy coating[J]. J. Mater. Sci. Technol., 2021, 67: 226-236.

Figures/Tables 13

Fig. 1. Structure spectra of pristine and modified graphene: (a) FTIR; (b) UV-vis; (c) Raman; (d) XPS; (e) XPS-C 1s-CDs-G; (f) XPS-N 1s-CDs-G.

Fig. 2. Morphology and dispersion of pristine and modified graphene: (a) SEM-G; (b) SEM-CDs-G; (c) EDS-O; (d) EDS-N; (e) TEM-G; (f) TEM-CDs-G; (g) TEM-G/EP; (h) TEM-CDs-G/EP.

Fig. 3. Internal morphology of coating and the overall distribution of graphene in coating: (a) EP; (b) G0.5 %/EP; (d) CDs-G0.5 %/EP; (e) CDs-G1%/EP; Raman intensity maps for (c) G0.5 %/EP and (f) CDs-G0.5 %/EP.

Fig. 4. OCP value in the steady state of coating.

Fig. 5. Electrochemical impedance of coating in NaCl solution without and with the addition of graphene: (a, b) EP; (c, d) G0.5 %/EP; (e, f) CDs-G0.5 %/EP; (g, h) CDs-G1%/EP.

Fig. 6. Equivalent circuit model fitted with the simple R(QR) (a) and R(QR(QR)) (b) electrical models.

Fig. 7. Fitting parameters of coating during immersion process: (a) Rc; (b) Rct; (c) Qc; (d) Qdl.

Fig. 8. Self-healing behavior of coating in NaCl solution through SVET method: (a, b) EP; (c, d) G0.5 %/EP; (e, f) CDs-G0.5 %/EP; (g, h) CDs-G1%/EP.

Fig. 9. Oxygen permeability coefficient (a) and water absorption (b) of coating.

Fig. 10. Roughness of corrosion region on steel surface under different coatings: (a) EP; (b) G0.5 %/EP; (c) CDs-G0.5 %/EP; (d) CDs-G1%/EP.

Fig. 11. SEM images and EDS spectra of corrosion region on steel surface under different coatings: (a, e-i) EP; (b, j) G0.5 %/EP; (c, k) CDs-G0.5 %/EP; (d, l) CDs-G1%/EP.

Fig. 12. XPS-N 1s spectrum of steel surface under CDs-G0.5 %/EP coating after immersion test.

Fig. 13. Corrosion protective mechanism diagram of all coatings: (a) EP; (b) G0.5 %/EP; (c) CDs-G0.5 %/EP; (d) CDs-G1%/EP.

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