Evaluation of the Anticorrosion Performance of CeO2-Modified Graphene Oxide Nanocomposite Epoxy Coating Subjected to Simulated Saline-Alkali Solution
Abstract
:1. Introduction
2. Materials and Methods
2.1. Raw Materials
2.2. Preparation of Simulated Saline Solution and Temperature Gradient Cycle
2.3. Preparation of CeO2–GO Epoxy Coating
2.4. Testing Procedures
2.4.1. Micromorphological Characterization
2.4.2. Electrochemical Testing
3. Anticorrosion Performance
3.1. Open Circuit Potential (OCP) Analysis
3.2. Electrochemical Alternating Current Impedance Spectroscopy (EIS) Analysis
3.3. Tafel Curve Analysis
3.4. Mott–Schottky Curve Analysis
4. Corrosion Morphology Comparison
4.1. Corrosion Depth Analysis of Substrate
4.2. Corrosion Area Analysis of Substrate
5. Conclusions
- (1)
- The anticorrosion properties of CeO2–GO nanocomposites as a coating were analyzed by OCP, EIS, Tafel curve and Mott–Schottky curve. The corrosion current density of the CeO2–GO (4:1)/EP coating after immersion for 31 d was the smallest of the four coatings, only 2.878 × 10−9 A/cm2, which was nearly two orders of magnitude lower than the EP coating. The corrosion current density of the CeO2/EP coating was 1.056 × 10−8 A/cm2, and the protection efficiency was 84.44%, which was also greatly improved compared with the EP coating, benefiting from the dense filling effect of CeO2 nanoparticles.
- (2)
- The 3D fitting image analysis with the stereo microscope showed that the CeO2–GO (4:1)/EP coating had the best barrier effect on the corrosive medium, and the depth of pitting corrosion was the smallest. By analyzing the area of different corrosion depths, the total corrosion area of the CeO2–GO/EP coating is 2513 μm2, which was much smaller than that of the EP coating, GO/EP coating and CeO2/EP coating, indicating that CeO2–GO (4:1) nanocomposite limited the further development of corrosion.
- (3)
- The product formed by the hydrolysis of CeO2 can fill the micropores on the surface and internal capillary channels of the coating and improve the compactness of the coating. At the same time, the CeO2–GO (4:1) nanocomposite had good compatibility with EP and could still show good anticorrosion performance in saline-alkali and temperature changing environments.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Component | NaHCO3 | CaCl2 | Na2SO4 | MgCl2 | NaCl |
---|---|---|---|---|---|
Concentration (g/L) | 0.113 | 0.232 | 2.5304 | 0.5698 | 3.1069 |
Coating | Ecorr (V) | Icorr (A/cm2) | η (%) | Rp (ohm) |
---|---|---|---|---|
G1 | −0.669 | 6.788 × 10−8 | - | 4.985 × 105 |
G2 | −0.631 | 5.783 × 10−8 | 14.81 | 5.078 × 105 |
G3 | −0.514 | 1.056 × 10−8 | 84.44 | 4.093 × 106 |
G4 | −0.527 | 2.878 × 10−9 | 95.76 | 1.475 × 107 |
Coating | 1 d ND (cm−3) | 11 d ND (cm−3) | 21 d ND (cm−3) | 31 d ND (cm−3) |
---|---|---|---|---|
G1 | 9.484 × 1014 | 7.349 × 1015 | 9.039 × 1016 | 4.243 × 1016 |
G2 | 8.923 × 1014 | 2.327 × 1015 | 9.039 × 1015 | 9.289 × 1015 |
G3 | 1.494 × 1013 | 1.664 × 1013 | 1.808 × 1014 | 5.530 × 1015 |
G4 | 5.970 × 1011 | 3.56 × 1012 | 5.165 × 1012 | 9.088 × 1012 |
Coating | Corrosion Area (μm2) | |||
---|---|---|---|---|
1 | 2 | 3 | Total | |
G1 | 443 | 1674 | 3744 | 5862 |
G2 | 160 | 1295 | 2750 | 4205 |
G3 | 75 | 639 | 3306 | 4020 |
G4 | 98 | 415 | 2000 | 2513 |
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Lyu, K.; Liu, X.; Liu, R.; Yang, H.; Qiao, Y.; Shah, S.P. Evaluation of the Anticorrosion Performance of CeO2-Modified Graphene Oxide Nanocomposite Epoxy Coating Subjected to Simulated Saline-Alkali Solution. Polymers 2022, 14, 1412. https://doi.org/10.3390/polym14071412
Lyu K, Liu X, Liu R, Yang H, Qiao Y, Shah SP. Evaluation of the Anticorrosion Performance of CeO2-Modified Graphene Oxide Nanocomposite Epoxy Coating Subjected to Simulated Saline-Alkali Solution. Polymers. 2022; 14(7):1412. https://doi.org/10.3390/polym14071412
Chicago/Turabian StyleLyu, Kai, Xiaoyan Liu, Ruidan Liu, Heng Yang, Yang Qiao, and Surendra P. Shah. 2022. "Evaluation of the Anticorrosion Performance of CeO2-Modified Graphene Oxide Nanocomposite Epoxy Coating Subjected to Simulated Saline-Alkali Solution" Polymers 14, no. 7: 1412. https://doi.org/10.3390/polym14071412