A comparison of corrosion inhibition of magnesium aluminum and zinc aluminum vanadate intercalated layered double hydroxides on magnesium alloys
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The magnesium aluminum and zinc aluminum layered double hydroxides intercalated with NO 3 - (MgAl-NO3-LDH and ZnAl-NO3-LDH) were prepared by the coprecipitation method, and the magnesium aluminum and the zinc aluminum layered double hydroxides intercalated with VO x - (MgAl-VO x -LDH and ZnAl-VO x -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-VO x -LDH and ZnAl-VO x -LDH on AZ31 Mg alloys. The results showed that ZnAl-VO x -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-VO x -LDH on the AZ31 magnesium alloy was proposed and discussed.
Keywordslayered double hydroxides anion-exchange thermal stability magnesium alloys inhibition
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This work was supported by the National Natural Science Foundation of China (Grant Nos. 51601108, 51571134, 21676285), the Natural Science Foundation of Shandong Province (Grant No. 2016ZRB01A62), the SDUST Research Fund (No. 2014TDJH104), and the Ministry-Province jointly-constructed cultivation base for the State Key Laboratory of Processing for Non-Ferrous Metal and Featured Materials, Guangxi Zhuang Autonomous Region.
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