CeO2 grafted carbon nanotube via polydopamine wrapping to enhance corrosion barrier of polyurethane coating. (January 2021)

• Record Type: Journal Article
• Authors: Cai, Guangyi; Xiao, Song; Deng, Chunming; Jiang, Dan; Zhang, Xinxin; Dong, Zehua
• Is Part Of: Corrosion science. Volume 178(2021)
• Publication Date: 2021-01
• Subjects: Polyurethane coating -- Corrosion -- CeO2 -- Carbon nanotube -- Wire beam electrode; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2020.109014
• Languages: English
• ISSNs: 0010-938X

Abstract

Graphical abstract: Highlights: Polydopamine (PDA) increases CeO2 loading amount and grafting strength on CNTs. CeO2 -PDA-CNTs hybrid pigment enhances corrosion barrier of polyurethane coating. Galvanic current and impedance mapping evidence synergic barrier of CeO2 and CNTs. Abstract: 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.