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

Junsheng Wu; Dongdong Peng; Yuntao He; Xiaoqiong Du; Zhan Zhang; Bowei Zhang; Xiaogang Li; Yizhong Huang

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

Materials (Basel). 2017 Apr 18;10(4):426. doi: 10.3390/ma10040426.

Authors

Junsheng Wu¹, Dongdong Peng^{2

3}, Yuntao He⁴, Xiaoqiong Du⁵, Zhan Zhang⁶, Bowei Zhang⁷, Xiaogang Li⁸, Yizhong Huang⁹

Affiliations

¹ Institute of Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China. wujs@ustb.edu.cn.
² Institute of Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China. ddpeng@ntu.edu.sg.
³ School of Materials Science and Engineering, Nanyang Technological University, Singapore 639798, Singapore. ddpeng@ntu.edu.sg.
⁴ National Science &Technology Infrastructure Center, Beijing 100862, China. wujsyy@126.com.
⁵ Institute of Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China. dxheyq@163.com.
⁶ Institute of Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China. yxzz0417@163.com.
⁷ School of Materials Science and Engineering, Nanyang Technological University, Singapore 639798, Singapore. BZHANG011@e.ntu.edu.sg.
⁸ Institute of Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China. lixiaogang99@263.net.
⁹ School of Materials Science and Engineering, Nanyang Technological University, Singapore 639798, Singapore. YZHuang@ntu.edu.sg.

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.

Keywords: aluminum alloy; corrosion protection; layered double hydroxides (LDHs); scanning electrochemical microscopy (SECM).