Superhydrophobic and corrosion-resistant siloxane-modified MgAl–LDHs coatings on magnesium alloy prepared under mild conditions

Wenxi Zhang; Zhangzelong Zhuo; Dan Xu; Liang Wu; Zhihui Xie

doi:10.1007/s12613-024-2927-3

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Wenxi Zhang, Zhangzelong Zhuo, Dan Xu, Liang Wu, and Zhihui Xie, Superhydrophobic and corrosion-resistant siloxane-modified MgAl–LDHs coatings on magnesium alloy prepared under mild conditions, Int. J. Miner. Metall. Mater.,(2025). https://doi.org/10.1007/s12613-024-2927-3

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Wenxi Zhang, Zhangzelong Zhuo, Dan Xu, Liang Wu, and Zhihui Xie, Superhydrophobic and corrosion-resistant siloxane-modified MgAl–LDHs coatings on magnesium alloy prepared under mild conditions, Int. J. Miner. Metall. Mater.,(2025). https://doi.org/10.1007/s12613-024-2927-3

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Research Article

Superhydrophobic and corrosion-resistant siloxane-modified MgAl–LDHs coatings on magnesium alloy prepared under mild conditions

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Corresponding author:
Zhihui Xie E-mail: zhxie@cwnu.edu.cn
Received: 18 January 2024; Revised: 18 April 2024; Accepted: 6 May 2024; Available online: 8 May 2024

Abstract

Abstract

In this study, we have developed a superhydrophobic and corrosion-resistant LDH-W/PFDTMS composite coating on the surface of Mg alloy. This composite comprised a tungstate-intercalated (LDH-W) underlayer that was grown at low temperature (relative to hydrothermal reaction conditions) under atmospheric pressure and an outer polysiloxane layer created from a solution containing perfluorodecyltrimethoxysilane (PFDTMS) using a simple immersion method. The successful intercalation of tungstate into the LDH phase and the following formation of the polysiloxane layer were confirmed through X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, and X-ray photoelectron spectroscopy (XPS). The corrosion resistance of the LDH-W film, both before and after the PFDTMS modification, was evaluated using electrochemical impedance spectroscopy (EIS), Tafel curves, and immersion experiments. The results showed that Mg coated with LDH-W/PFDTMS exhibited significantly enhanced corrosion protection compared to the unmodified LDH-W film, with no apparent signs of corrosion after exposure to 3.5wt% NaCl solution for 15 d. Furthermore, the LDH-W/PFDTMS coating demonstrated superior superhydrophobicity and self-cleaning properties against water and several common beverages, as confirmed by static contact angle and water-repellency tests. These results offer valuable insights into preparing superhydrophobic and corrosion-resistant LDH-based composite coatings on Mg alloy surfaces under relatively mild reaction conditions.
- Mg alloy;
- corrosion;
- coating;
- layered double hydroxide

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