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Morphology,structure and corrosion resistance of Mg-Al LDH films fabricated in different Al^(3+)concentration solutions

查看全文 作　　者：Liang [1,2]Wu;Xing-Xing [1]Ding;Xiao-Feng [3]Zhao;Yuan-Huan [1]Liu;Xue-Long [4]Hao;Ai-Tao [1,2]Tang;Gen [1]Zhang;Fu-Sheng [1,2]Pan 高影响力作者 机构地区：[1]School of Materials Science and Engineering,Chongqing University,Chongqing,400044,China;[2]National Engineering Research Center for Magnesium Alloys,Chongqing University,Chongqing,400044,China;[3]SunRui Marine Environment Engineering Company Ltd,Qingdao,266101,China;[4]National Center of Analysis and Testing for Nonferrous Metals and Electronic Materials,General Research Institute for Nonferrous Metals,Beijing,100088,China高影响力机构 出　　处：《Rare Metals》索引2023年第42卷第2期,共8页高影响力期刊 基　　金：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 ChongqingPostdoctoral Scientific Research Foundation(Xm2017010);the Chongqing Research Program of Basic Research and Frontier Technology(cstc2016jcyjA0388,cstc2017jcyjBX0040)。 摘　　要：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 Al^(3+)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 Al^(3+)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 in0.032 mol·L^(-1)Al^(3+)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. 关 键 词：Magnesium alloy In situ method Layered double hydroxide(LDH)films Al^(3+)concentration Corrosion resistance
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