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Corrosion resistance of Mg(OH)2/Mg–Al-layered double hydroxide coatings on magnesium alloy AZ31: influence of hydrolysis degree of silane

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Abstract

Mg(OH)2/Mg–Al-layered double hydroxide (LDH) coatings were modified with methyltrimethoxysilane (MTMS) on magnesium alloys. Effect of hydrolysis degree of silane solution on coating formation was investigated. Chemical compositions and surface morphologies of the coatings were examined using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS) and field-emission scanning electronic microscopy (FESEM). Results indicated that the composite coatings consisted of polymethyltrimethoxysilane (PMTMS), LDH and Mg(OH)2. Electrochemical and hydrogen evolution measurements revealed that the composite coatings possessed good corrosion resistance, especially the ones prepared in a high hydrolysis degree of silane. The optimum corrosion resistance of the composite coating was LDH/PMTMS-3 coating, which had the lowest value of corrosion current density (5.537 × 10−9 A·cm−2) and a dense surface. Plausible mechanism for coating formation and corrosion process of MTMS-modified Mg(OH)2/Mg–Al-LDH coatings were discussed.

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Acknowledgements

This work was financially supported by the National Natural Science Foundation of China (Nos. 51601108 and 51571134), the Natural Science Foundation of Shandong Province (No. 2016ZRB01A62), the Shandong University of Science and Technology Research Fund (No. 2014TDJH104) and the Opening Fund of Ministry-Province Jointly Constructed Cultivation Base for State Key Laboratory of Processing for Non-ferrous Metal and Featured Materials.

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Authors and Affiliations

  1. College of Materials Science and Engineering, Shandong University of Science and Technology, Qingdao, 266590, China

    Qing-Song Yao, Zhong-Chao Li, Zai-Meng Qiu, Fen Zhang & Rong-Chang Zeng

  2. School of Engineering, RMIT University, Carlton, VIC, 3053, Australia

    Xiao-Bo Chen

  3. School of Materials Science and Energy Engineering, Foshan University, Foshan, 528000, China

    Dong-Chu Chen

  4. School of Materials Science and Engineering, Zhengzhou University, Zhengzhou, 450002, China

    Shao-Kang Guan

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  1. Qing-Song Yao
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Correspondence to Fen Zhang or Rong-Chang Zeng.

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Yao, QS., Li, ZC., Qiu, ZM. et al. Corrosion resistance of Mg(OH)2/Mg–Al-layered double hydroxide coatings on magnesium alloy AZ31: influence of hydrolysis degree of silane. Rare Met. 38, 629–641 (2019). https://doi.org/10.1007/s12598-019-01234-1

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