CeO2 grafted carbon nanotube via polydopamine wrapping to enhance corrosion barrier of polyurethane coating

CeO2 nanoparticles grafted on carbon nanotubes (CNTs) with polydopamine (PDA) as interface layer (CeO2-PDA-CNTs) were prepared and dispersed into polyurethane (PU) to enhance the corrosion barrier of PU coating. Electrochemical impedance spectroscopy (EIS), wire beam electrode (WBE) technique and surface characterization demonstrate that CeO2-PDA-CNTs/PU composite coating significantly possesses the better corrosion and permeation resistance than other PU-based coatings. The barrier performance of the composite coating is mainly ascribed to the sandwiched CeO2-PDA-CNTs nanostructure, which achieves synergistic effect between the corrosion inhibition of CeO2 and the bonding strength reinforcement and permeation pathway twist due to PDA wrapped CNTs.

Automated summary

CeO2 nanoparticles grafted on carbon nanotubes with polydopamine as the interface layer, dispersed into polyurethane, significantly enhance the corrosion resistance of PU coating. The composite coating shows better corrosion and permeation resistance compared to other PU-based coatings, mainly due to the sandwiched CeO2-PDA-CNTs nanostructure achieving synergistic effects.