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

作　　者：Wenxi Zhang Zhangzelong Zhuo Dan Xu Liang Wu Zhihui Xie 

机构地区：[1]Chemical Synthesis and Pollution Control Key Laboratory of Sichuan Province,College of Chemistry and Chemical Engineering,China West Normal University,Nanchong 637002,China [2]College of Materials Science and Engineering/National Engineering Research Center for Magnesium Alloys,Chongqing University,Chongqing 400044,China

出　　处：《International Journal of Minerals,Metallurgy and Materials》2025年第2期450-463,共14页矿物冶金与材料学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(No.52271073);the Sichuan Provincial Natural Science Foundation for Distinguished Young Scholars,China(No.2024NSFJQ0034);the Innovation Team Funds of China West Normal University(No.KCXTD2024-1)。

摘　　要：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 LDHW 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.

关 键 词：Mg alloy CORROSION coating layered double hydroxide 

分 类 号：TG174.4[金属学及工艺—金属表面处理]