Solution-processed highly adhesive graphene coatings for corrosion inhibition of metals
doi: 10.1009/s12274-020-2948-91-24
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Abstract:
The corrosion of metals can be induced by different environmental and operational conditions, and protecting metals from corrosion is a serious concern in many applications. The development of new materials and/or technologies to improve the efficiency of anti-corrosion coatings has attracted renewed interest. In this study, we develop a protective coating composed of a bilayer structure of reduced graphene oxide (RGO)/graphene oxide (GO) applied to Cu plates by spray-coating and subsequent annealing. The annealing of the GO/Cu plates at 120 ℃ produces a bilayer structure of RGO/GO by the partial reduction of the spray-coated GO layer. This induces superior corrosion resistance and adhesion strength compared to those of GO/Cu and RGO/Cu plates because of the hydrophobic nature of the RGO surface exposed to the surroundings and the formation of Cu-O bonds with the O-based functional groups of GO. This approach provides a viable and scalable route for using graphene coatings to protect metal surfaces from corrosion.
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Key words:
- graphene /
- metal /
- surface coating /
- corrosion /
- solution process
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Figure Figure 1. (a) Schematic of the preparation process for GO- and RGO-coated metal plates by spray-coating. FESEM images of (b) Cu and (c) as-coated GO/Cu plates.
Figure Figure 2. (a) Photographs of Cu, as-coated GO/Cu, 90 ℃-annealed GO/Cu, 120 ℃-annealed GO/Cu, and RGO/Cu plates before and after immersion in salt solutions for 96 h (scale bar: 5 mm). (b) XRD patterns of Cu, as-coated GO/Cu, 90 ℃-annealed GO/Cu, 120 ℃-annealed GO/Cu, and RGO/Cu plates after immersion in salt solutions for 96 h, together with the XRD pattern of the pristine Cu plate for comparison.
Figure Figure 3. Water contact angles on the surfaces of (a) pristine Cu, (b) as-coated GO/Cu, (c) 90 ℃-annealed GO/Cu, (d) 120 ℃-annealed GO/Cu, and (e) RGO/Cu plates. (f) Comparison of water contact angles for all the samples.
Figure Figure 4. Photographs of as-coated GO/Cu, 90 ℃-annealed GO/Cu, 120 ℃- annealed GO/Cu, RGO/Cu, and 120 ℃-annealed RGO/Cu plates before and after cross-cut tests (scale bar: 5 mm).
Figure Figure 5. (a) C 1s and (b) Cu 2p XPS spectra of as-coated GO/Cu, 90 ℃- annealed GO/Cu, 120 ℃-annealed GO/Cu, and RGO/Cu plates. C 1s and Cu 2p XPS depth profile spectra of (c) as-coated and (d) 120 ℃-annealed GO/Cu plates.
Figure Figure 6. Schematics for the lamellar structures of graphene sheets coated on Cu plates, showing oxygen-based functional groups and Cu-O bonds formed upon post-annealing treatment: (a) as-coated GO/Cu, (b) 90 ℃-annealed GO/Cu, and (c) 120 ℃-annealed GO/Cu plates. The 120 ℃-annealed GO/Cu plate creates a RGO/GO/Cu structure by partial reduction of the GO layer, leading to superior corrosion resistance and adhesion strength.
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