Preparation of Quantum Dot Modified g-C3 N4@Fe2 O3 Composite Particles and Their Application in Waterborne Epoxy-Acrylate Emulsions
With unique properties,waterborne epoxy-acrylate emulsions(WEP)have been widely used in the field of coating.However,they only share a small percentage of the total market of anticorrosive coatings because their anticorrosion performance is much inferior to that of solvent coatings.g-C3N4@Fe2O3 composite particles were prepared by calcination method.Quantum dot solutions were prepared by microwave method using citric acid and urea.The morphology structures of the composite particles were characterized by FT-IR,XRD,XPS and TEM.The morphology of the composite coatings was characterized by SEM.And the corrosion resistance of the composite coatings was analyzed by electrochemical measurement and salt spray test.The results show that Fe2O3 particles were successfully loaded onto g-C3N4 nanosheet,and the dispersion of the obtained g-C3N4@Fe2O3 composites by the modification of quantum dots in the waterborne epoxy-acrylate emulsions is improved greatly compared with that of g-C3N4 and g-C3N4@Fe2O3.The value of|Z|0.01Hz of the g-C3N4@Fe2O3/WEP modified with quantum dots coating is 1.5×1010 Ω·cm2 after 1 d immersion in 3.5% NaCl solution,and is still 8.7×109 Ω·cm2 after 7 d,which is higher two order of magnitude than that of the blank WEP coating.After 168 h of neutral salt test,the film of the g-C3N4@Fe2O3/WEP modified with quantum dots coating has little level of rusting spots and blistering density.
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