Corrosion protection of waterborne epoxy coatings containing mussel-inspired adhesive polymers based on polyaspartamide derivatives on carbon steel

doi:10.1016/j.jmst.2018.05.009

Abstract

Abstract:

A novel mussel-inspired adhesive polymer (PHEA-DOPA) containing the 3,4-dihydroxyphenylalanine (DOPA) functional group based on polyaspartamide derivatives was synthesized. The corrosion protection of the waterborne epoxy coatings containing the adhesive polymers was investigated by electrochemical impedance spectroscopy (EIS). The results indicated that the PHEA-DOPA could improve the corrosion resistance of the waterborne epoxy coating. The corrosion products were also analyzed by Raman microspectroscopy (RM), indicating the formation of the insoluble DOPA-Fe complexes on the carbon steel surface. These complexes simultaneously acting as a passivating layer, can inhibit the process of corrosion at the metal-solution interface. The differential scanning calorimeter (DSC) measurement indicated that PHEA-DOPA can increase the crosslinking density of coating. The effect of O₂ on the protective mechanism of the PHEA-DOPA coating in a 3.5% NaCl solution was also evaluated by EIS. The results indicated that the barrier effect was significantly improved under aerated conditions because DOPA was oxidized to DOPA-quinone (Dq) by O₂, which triggered the reaction with Fe ions that were released from the surface of the carbon steel. This led to more compact coatings.

Key words: Corrosion protection, Adhesive polymer, Inhibito, Waterborne, PHEA-DOPA

Mingliang Yang, Jianhua Wu, Daqing Fang, Bo Li, Yang Yang. Corrosion protection of waterborne epoxy coatings containing mussel-inspired adhesive polymers based on polyaspartamide derivatives on carbon steel[J]. J. Mater. Sci. Technol., 2018, 34(12): 2464-2471.

Figures/Tables 12

Fig. 1. Reaction scheme for the PHEA-DOPA synthesis.

Fig. 2. FT-IR absorption spectroscopy of the three polymers.

Fig. 3. EIS plots of the EP coating (a, b), PHEA coating (c, d), and PHEA-DOPA coating (e, f) with different immersion times in 3.5% NaCl solution.

Fig. 4. Equivalent circuit used to fit the EIS coating data: (a) one time constant and (b) two time constants.

Fig. 5. DSC spectra for EP coating, PHEA coating, and PHEA-DOPA coating.

Fig. 6. SEM images of corrosion morphology of carbon steel beneath coatings after EIS measurements: (a) EP coating, (b) PHEA coating, and (c) PHEA-DOPA coating.

Fig. 7. Adhesion strength of the EP coating, PHEA coating, and PHEA-DOPA coating after different immersion times.

Fig. 8. Raman microscopy of the surface of the carbon steel after coating removal: (a) EP coating, (b) PHEA coating, and (c) PHEA-DOPA coating after EIS measurements, as well as (d) the PHEA-DOPA coating before EIS measurements.

Fig. 9. Coating resistances (Rpore) with the immersion time of EP, PHEA, and PHEA-DOPA coating in 3.5% NaCl solution.

Fig. 10. EIS plots of the PHEA-DOPA coating with different exposure times in deaerated 3.5% NaCl solution.

Fig. 11. Coating resistances (Rpore) of the PHEA-DOPA coating in the deaerated and aerated 3.5% NaCl solution with different immersion times.

Fig. 12. Schematic illustration of the protective mechanism of PHEA-DOPA with O2 in the coating.

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