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Morphology, structure and corrosion resistance of Mg–Al LDH films fabricated in different Al3+ concentration solutions

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Abstract

In situ-grown Mg–Al layered double hydroxide (LDH) films were obtained on an anodized AZ31 substrate, with the immersion of sample in different concentrations of Al3+ solution. The structure, composition and morphology of LDH films were investigated by X-ray diffraction (XRD), Fourier transform infrared (FTIR) and scanning electronic microscopy (SEM), and the corrosion behavior of LDH films was further studied by electrochemical impedance spectroscopy (EIS). The influence of Al3+ concentration on the growth behavior of LDH was also discussed. The results indicated that the nest-like structure of MgAl-LDH film was composed of interconnected MgAl-LDH nanosheets. Besides, the LDH obtained in 0.032 mol·L−1 Al3+ solution, possessing dense laminated structure, could effectively seal the porous surface of anodic oxide film. EIS results revealed that the samples coated with LDH films showed a higher electrochemical impedance, and thus, the corrosion resistance of samples coated with LDH films was signally improved compared with the anodized alloy.

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Acknowledgements

This work was supported by the National Key Research and Development Program of China (2016YFB0301100), the National Natural Science Foundation of China (51701029, 51531002, 51474043), China Postdoctoral Science Foundation Funded Project (2017M620410, 2018T110942), the Chongqing Postdoctoral Scientific Research Foundation (Xm2017010) and the Chongqing Research Program of Basic Research and Frontier Technology (cstc2016jcyjA0388, cstc2017jcyjBX0040).

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Authors and Affiliations

  1. School of Materials Science and Engineering, Chongqing University, Chongqing, 400044, China

    Liang Wu, Xing-Xing Ding, Yuan-Huan Liu, Ai-Tao Tang, Gen Zhang & Fu-Sheng Pan

  2. National Engineering Research Center for Magnesium Alloys, Chongqing University, Chongqing, 400044, China

    Liang Wu, Ai-Tao Tang & Fu-Sheng Pan

  3. SunRui Marine Environment Engineering Company Ltd, Qingdao, 266101, China

    Xiao-Feng Zhao

  4. National Center of Analysis and Testing for Nonferrous Metals and Electronic Materials, General Research Institute for Nonferrous Metals, Beijing, 100088, China

    Xue-Long Hao

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  1. Liang Wu
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Correspondence to Liang Wu.

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Wu, L., Ding, XX., Zhao, XF. et al. Morphology, structure and corrosion resistance of Mg–Al LDH films fabricated in different Al3+ concentration solutions. Rare Met. 42, 697–704 (2023). https://doi.org/10.1007/s12598-018-1191-y

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  • DOI: https://doi.org/10.1007/s12598-018-1191-y

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