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Materials 2017, 10(4), 426; doi:10.3390/ma10040426

In Situ Formation of Decavanadate-Intercalated Layered Double Hydroxide Films on AA2024 and their Anti-Corrosive Properties when Combined with Hybrid Sol Gel Films

1
Institute of Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China
2
School of Materials Science and Engineering, Nanyang Technological University, Singapore 639798, Singapore
3
National Science &Technology Infrastructure Center, Beijing 100862, China
*
Authors to whom correspondence should be addressed.
Received: 15 March 2017 / Revised: 8 April 2017 / Accepted: 11 April 2017 / Published: 18 April 2017
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Abstract

A layered double hydroxide (LDH) film was formed in situ on aluminum alloy 2024 through a urea hydrolysis method, and a decavanadate-intercalated LDH (LDH-V) film fabricated through the dip coating method. The microstructural and morphological characteristics were investigated by scanning electron microscopy (SEM). The corrosion-resistant performance was analyzed by electrochemical impedance spectroscopy (EIS), scanning electrochemical microscopy (SECM), and a salt-spray test (SST).The SEM results showed that a complete and defect-free surface was formed on the LDH-VS film. The anticorrosion results revealed that the LDH-VS film had better corrosion-resistant properties than the LDH-S film, especially long-term corrosion resistance. The mechanism of corrosion protection was proposed to consist of the self-healing effect of the decavanadate intercalation and the shielding effect of the sol-gel film. View Full-Text
Keywords: layered double hydroxides (LDHs); aluminum alloy; corrosion protection; scanning electrochemical microscopy (SECM) layered double hydroxides (LDHs); aluminum alloy; corrosion protection; scanning electrochemical microscopy (SECM)
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Wu, J.; Peng, D.; He, Y.; Du, X.; Zhang, Z.; Zhang, B.; Li, X.; Huang, Y. In Situ Formation of Decavanadate-Intercalated Layered Double Hydroxide Films on AA2024 and their Anti-Corrosive Properties when Combined with Hybrid Sol Gel Films. Materials 2017, 10, 426.

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