Abstract
A novel Al2O3–PDA–MoS2 nanohybrid was synthesized by depositing Al2O3 nanoparticles on the surface of molybdenum disulfide (MoS2) sheets covered with polydopamine (PDA). Many characterizations demonstrated that the Al2O3 was successfully deposited on the surface of MoS2. It was found that when the mass ratio of PDA–MoS2 to Al2O3 was 1.5:1, the nano-hybrid filler showed good dispersion performance. Then, the composite coating samples were prepared by adding Al2O3–PDA–MoS2 (1.5:1) hybrid to waterborne epoxy resin. The effects of Al2O3, MoS2, and PDA–MoS2 on the corrosion resistance of epoxy coating were also investigated. The potentiodynamic polarization test demonstrated that Al2O3–PDA–MoS2 nanohybrids had excellent corrosion inhibition properties. The results of electrochemical impedance spectroscopy also revealed that the impedance modulus of Al2O3–PDA–MoS2/EP composite coating was nearly two orders of magnitude higher than that of pure epoxy resin after immersion in saline for 21 days. This study confirmed that Al2O3–PDA–MoS2 nanosheets had better barrier properties and corrosion inhibition properties, and provided a new idea for the wide application of nanofillers in the field of anticorrosion.
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Acknowledgements
The authors sincerely acknowledge Xinxing Casting Pipe Co., Ltd., Hebei Province and Shanghai Municipal Science and Technology Commission Project (YDZX20223100004006) for funding and raw materials.
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Rui Meng: conceptualization, formal analysis, data curation, writing—original draft, writing—review and editing, investigation. Liqin Liu: conceptualization, supervision. Weihong Guo: conceptualization, resources, supervision, writing—review and editing. All authors read and approved the final manuscript.
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Meng, R., Liu, L. & Guo, W. Mussel-inspired polydopamine and Al2O3 nanoparticles co-modified MoS2 for reinforcing anticorrosion of epoxy coatings. Colloid Polym Sci 301, 175–187 (2023). https://doi.org/10.1007/s00396-022-05052-3
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DOI: https://doi.org/10.1007/s00396-022-05052-3