ZIF-8-based micro-arc oxidation composite coatings enhanced the corrosion resistance and superhydrophobicity of a Mg alloy  

作　　者：Shiquan Jiang Zhiyuan Zhang Dong Wang Yuqing Wen Ning Peng Wei Shang 

机构地区：[1]Guangxi Key Laboratory of Electrochemical and Magnetochemical Function Materials,College of Chemistry and Bioengineering,Guilin University of Technology,Guilin 541004,China

出　　处：《Journal of Magnesium and Alloys》2023年第4期1367-1380,共14页镁合金学报（英文）

基　　金：supported by Guangxi Natural Science Foundation of China(No.2020GXNSFAA159011);National Natural Science Foundation of China(No.51664011);Guangxi Key Laboratory Foundation of China(No.EMFM20211120).

摘　　要：Mg alloys are considered the most promising engineering materials because of their unique properties.However,the uncontrolled corrosion rate of these alloys limits their applications.Therefore,in this study,a micro-arc oxidation layer was used as a transition layer to“directly”grow a zinc-based metal-organic framework(MOF)composite coating on the surface of a Mg alloy(AZ91D).Herein,the two zeolitic imidazolate framework(ZIF-8)coatings with different morphologies were separately prepared by homologous metal oxide induction and a one-step in-situ growth method.The superhydrophobic composite coating showed strong hydrophobicity and self-cleaning properties,which could prevent the penetration of water and corrosive ions(Cl^(−))into the surface of AZ91D.Electrochemical tests demonstrated that the super-hydrophobic composite coatings greatly enhanced the corrosion resistance of AZ91D,and the corrosion current density decreased from 10^(−5)to 10^(−9)A/cm^(2).These results indicate that the ZIF-8 coatings are beneficial for improving the hydrophobicity and enhancing the corrosion resistance of Mg alloys.Therefore,MOF composite coatings provide a new strategy that can be used to prepare multifunctional anticorrosion coatings on metal substrates.

关 键 词：Mg alloy Composite coating Metal-organic framework Corrosion resistance SUPERHYDROPHOBICITY 

分 类 号：TG174.4[金属学及工艺—金属表面处理]