Graphene oxide–cerium oxide hybrids for enhancement of mechanical properties and corrosion resistance of epoxy coatings

• Published in: Journal of materials science 2021-06, Vol.56 (16), p.10108-10123
• Main Authors: Ma, Lingwei, Wang, Xuanbo, Wang, Jinke, Zhang, Juantao, Yin, Chengxian, Fan, Lei, Zhang, Dawei
• Format: Article
• Language: English
• Subjects: Adhesion tests; Adhesive strength; Alloys; Aluminum base alloys; Cerium; Cerium oxides; Characterization and Evaluation of Materials; Chemistry and Materials Science; Classical Mechanics; Coatings; Coefficient of friction; Corrosion and anti-corrosives; Corrosion effects; Corrosion prevention; Corrosion resistance; Crystallography and Scattering Methods; Electrochemical impedance spectroscopy; Epoxy coatings; Epoxy resins; Graphene; Graphite; Hardness; Materials Science; Mechanical properties; Metals & Corrosion; Modulus of elasticity; Nanoindentation; Polymer Sciences; Protective coatings; Salt spray tests; Solid Mechanics; Wear resistance
• ISSN: 0022-2461; 1573-4803
• DOI: 10.1007/s10853-021-05932-z

In this study, graphene oxide–cerium oxide (GO–CeO 2 ) hybrids were synthesized through an in situ hydrothermal approach and were incorporated into epoxy resin to prepare a robust coating for aluminum alloy protection. The mechanical properties of the GO–CeO 2 -loaded coating were characterized by nano-indentation, friction-wear test and pull-off adhesion test, using pristine epoxy coating and GO-loaded epoxy coating for comparison. Results revealed that GO–CeO 2 addition could increase the hardness, elastic modulus and the wear resistance and decrease the friction coefficient of the composite coating. Compared with pristine epoxy coating, the adhesion strength of GO–CeO 2 /epoxy coating increased from 7.3 MPa to 12.2 MPa. Such improvement in the mechanical properties can be explained by the good dispersion of GO–CeO 2 in the composite coating. In addition, salt spray and electrochemical impedance spectroscopy (EIS) measurement results showed that the corrosion resistance of the GO–CeO 2 -loaded coating was significantly enhanced. After 30 days of salt spray test, the coating resistance of the GO–CeO 2 /epoxy coating was 17.8 and 3.5 times higher compared with that of the blank epoxy coating and GO/epoxy coating, respectively. The superior barrier performance of the composite coating was mainly ascribed to the synergistic effects of the prolonged pathway against corrosive media permeation and the corrosion inhibition effect of CeO 2 particles.