Superior anti-corrosion and self-healing bi-functional polymer composite coatings with polydopamine modified mesoporous silica/graphene oxide

doi:10.1016/j.jmst.2021.04.019

Abstract

Abstract:

In this article, graphene oxide (GO) and benzotriazole-loaded mesoporous silica nanoparticles (BTA/MSNs) are combined on micro scale through the in situ polymerization of polydopamine (PDA), preparing a self-healing bi-functional GO (fGO) used as nano-fillers for anti-corrosion enhancement of waterborne epoxy (WEP) coatings. Scanning electronic microscopy (SEM) images show that the BTA/MSNs are uniformly distributed on the surface of high aspect ratio GO nanosheets to endow GO nanocontainer characteristics. UV-vis profiles demonstrate that fGO has pH-controlled release function. Modulus at lowest frequency is generally used for comparing the corrosion resistance of organic coatings. Modulus at lowest frequency (1.42 × 10⁷ Ω•cm²) after 30 days immersion in 3.5 wt.% NaCl solution revealed 2 orders of magnitude higher that of blank WEP (1.17 × 10⁵ Ω•cm²). With artificial cracks on its coatings, fGO/WEP had no obvious rust compared with blank WEP after 240 hrs of immersion. We anticipate that self-healing and physical barrier bi-functional nanocontainers improve the traditional anticorrosion coating efficiency with better, longer-lasting performance for shipping, oil drilling or bridge maintenance.

Key words: Mesoporous silica, Graphene oxide, Anti-corrosion, Self-healing, Functional composite coatings

Yanqi Ma, Haowei Huang, Hongda Zhou, Michael Graham, James Smith, Xinxin Sheng, Ying Chen, Li Zhang, Xinya Zhang, Elena Shchukina, Dmitry Shchukin. Superior anti-corrosion and self-healing bi-functional polymer composite coatings with polydopamine modified mesoporous silica/graphene oxide[J]. J. Mater. Sci. Technol., 2021, 95: 95-104.

Figures/Tables 9

Fig. 1. Experimental scheme showing fGO preparation using GO and MSNs as raw materials and incorporation of fGO into the composite WEP coating. Please refer to Supporting Information Section for experimental details.

Fig. 2. SEM images of (a) MSNs, (c, d) GO, (e, f) mGO, and (g, h) fGO; (b) TEM image of MSNs.

Fig. 3. (a) FTIR spectra, (b) XRD patterns of MSNs, GO, mGO, and fGO; (c) TGA curves of BTA, GO, MSNs, mGO, and fGO; (d) release profiles of BTA in MSNs or fGO when facing different pH environments.

Fig. 4. SEM images of cross-section of (a) blank WEP, (b) GO/WEP, (c) mGO/WEP and (d) fGO/WEP produced by liquid nitrogen quenching.

Fig. 5. The Bode modulus of (a) blank WEP, (c) GO/WEP, (e) mGO/WEP and (g) fGO/WEP and Bode phase angle of (b) blank WEP, (d) GO/WEP, (f) mGO/WEP and (h) fGO/WEP.

Fig. 6. (a) |Z0.01Hz|, (c) CPEdl and (d) Rct of MSNs, GO, mGO, and fGO during immersion in NaCl soultion; (b) The EEC used for simulating EIS data.

Fig. 7. Visual images (left) of blank WEP, GO/WEP, mGO/WEP and fGO/WEP before and after immersion in 3.5 wt.% NaCl solution for 240 hrs. The yellow/red arrows show the intersection of the two scratches made with a scalpel. The area of the coating exposed to the corrosive environment is 7.07 cm2. SEM images (right) of the intersection of the scratches of blank WEP, GO/WEP, mGO/WEP and fGO/WEP after immersion.

Fig. 8. SEM-EDS result of the intersection of the scratches of (a) blank WEP, (b) GO/WEP, (c) mGO/WEP and (d) fGO/WEP.

Fig. 9. Schematic presentation of the anticorrosion performance of blank WEP (left) and fGO/WEP (right).

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