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Journal of Chinese Society for Corrosion and protection  2024, Vol. 44 Issue (1): 107-118    DOI: 10.11902/1005.4537.2023.012
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Preparation and Perfromance of Rare Earth Cerium Modified Graphene Oxide / Waterborne Epoxy Resin Composite Coating
CHEN Shirun, CHEN Wenge(), QIAN Ying, ZHANG Hui
School of Material Science and Engineering, Xi'an University of Technology, Xi'an 710048, China
Cite this article: 

CHEN Shirun, CHEN Wenge, QIAN Ying, ZHANG Hui. Preparation and Perfromance of Rare Earth Cerium Modified Graphene Oxide / Waterborne Epoxy Resin Composite Coating. Journal of Chinese Society for Corrosion and protection, 2024, 44(1): 107-118.

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Abstract  

The prepared rare earth cerium modified graphene/waterborne epoxy resin composite coating was applied on the surface of Q235 steel by spraying, rolling and brushing respectively, then of which the structure and corrosion resistance in 3.5%NaCl solution were studied. The results showed that as nano particles, rare earth cerium or CeO2 was chemically deposited on the surface of graphene, while the modified graphene was uniformly distributed in epoxy resin as small lamellae. The applied composite coating on Q235 steel presents a stacked structure of graphene lamellae, while the fractured surface of the coating presents a pattern of river-like silve stripes. The formation of the composite coating applied by different methods may be described as that: the spraying method relies on the high-speed moving gas to impact the atomized coating droplets onto the surface of the substrate and quickly gather and spread them into a film, which improves the combination of the coating to the substrate while purifying the surface of the substrate. The roller coating method relies on the wire rod coater, and the brush coating method relies on the soft brush to combine the coating with the substrate. Thus molecules in the coating are easy to stack, and mocropores may easy form on the surface. The adhesion of the coating was measured to be 0-1, the hardness was 2H, and the surface roughness was ~2 μm. The corrosion rate is 1.565 × 10-4-5.889 × 10-3 mm/a. It is found that the coating applied by spraying method has the best comprehensive performance.

Key words:  rare earth modification      graphene      water based coating      decorate method     
Received:  19 January 2023      32134.14.1005.4537.2023.012
ZTFLH:  TQ637  
Fund: Shaanxi Coal Industry Group United Fund of China(2019JLM-2);Xi'an Scinece and Technology Planning Project(21XJZZ0042)
Corresponding Authors:  CHEN Wenge, E-mail: wgchen001@263.net

URL: 

https://www.jcscp.org/EN/10.11902/1005.4537.2023.012     OR     https://www.jcscp.org/EN/Y2024/V44/I1/107

Fig.1  TEM (a) and HREM (b) images of CeO2@rGO, XRD patterns (c) and FT-IR spectra (d) of three coatings. The insets in Fig.1b show the enlarged image of the local area marked by the box, and electron diffraction pattern of CeO2
Fig.2  SEM surface images (a, c) and fracture sections (b, d) of the CeO2@rGO/EP composite coating
Fig.3  SEM surface images (a, b, c), corresponding enlarged images (a1, b1, c1) of the local areas marked by the blocks, and cross sections (a2, b2, c2) for the CeO2@rGO / EP composite coatings prepared by spraying (a, a1, a2), roller painting (b, b2, b2) and brush painting (c, c1, c2), respectively
Decorate methodAdhesionHardnessWater contact angleSurface roughness /μmSurface energy / mJ·m-2
SprayingLevel 02H62.0° ± 1.8°2.7 ± 0.265.7 ± 0.7
Roller paintingLevel 12H65.3° ± 1.6°2.2 ± 0.264.4 ± 0.9
Brush paintingLevel 02H61.8° ± 1.6°2.0 ± 0.165.8 ± 0.5
Table 1  Determined properties of the composite coatings prepared by spraying, roller painting and brush painting
Fig.4  Schematic diagrams of the wetting models: (a) Wenzel model, (b) Cassie model, (c) intermediate state of Wenzel model and Cassie model
Fig.5  Three dimensional images (a, b, c) and sectional heights (a1, b1, c1) of the composite coatings prepared by spraying (a, a1), roller painting (b, b1) and brush painting (c, c1)
Fig.6  Polarization curves of the epoxy and composite coatings prepared by spraying, roller painting and brush painting
Fig.7  Nyquist (a) and Bode (b) plots and equivalent circuit diagrams (c, d) for the epoxy and composite coatings prepared by spraying, roller painting and brush painting in the initial (c) and mid (d) soak
CoatingCcRc / Ω·cm2CdlRct / Ω·cm2
Y0 / Ω-1·cm-2·s nnY0 / Ω-1·cm-2·s nn
Epoxy coatingSpraying8.141 × 10-50.58329716.64.085 × 10-100.87712969.20
Roller painting1.231 × 10-50.49629218.96.201 × 10-100.88023687.00
Brush painting6.564 × 10-60.57978536.42.719 × 10-100.88124553.40
Composite coatingSpraying1.159 × 10-60.5823299051.084 × 10-90.89725593.25
Roller painting5.026 × 10-60.48179522.61.921 × 10-100.93019172.20
Brush painting8.307 × 10-60.462340574.89.006 × 10-110.95919946.80
Table 2  Fitting parameters of electrochemical impedance spectra of the epoxy coating and the composite coatings
Fig.8  Schematic diagram of anti-corrosion mechanism of the composite coatings prepared by spraying (a), roller painting (b) and brush painting (c)
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