1. College of Material Science and Engineering, Shandong University of Science and Technology, Qingdao 266590, China 2. School of Materials Science and Engineering, Guangxi University, Nanning 530004, China
The magnesium aluminum and zinc aluminum layered double hydroxides intercalated with NO3− (MgAl-NO3-LDH and ZnAl-NO3-LDH) were prepared by the co-precipitation method, and the magnesium aluminum and the zinc aluminum layered double hydroxides intercalated with VOx− (MgAl-VOx-LDH and ZnAl-VOx-LDH) were prepared by the anion-exchange method. Morphologies, microstructures and chemical compositions of LDHs were investigated by SEM, EDS, XRD, FTIR, Raman and TG analyses. The immersion tests were carried to determine the corrosion inhibition properties of MgAl-VOx-LDH and ZnAl-VOx-LDH on AZ31 Mg alloys. The results showed that ZnAl-VOx-LDH possesses the best anion-exchange and inhibition abilities. The influence of treatment parameters on microstructures of LDHs were discussed. Additionally, an inhibition mechanism for ZnAl-VOx-LDH on the AZ31 magnesium alloy was proposed and discussed.
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