Ce对镁合金表面ZnAlCe-LDHs薄膜耐腐蚀性能的影响机理研究  

Effect of Ce on Corrosion Resistance of Films of ZnAlCe-layered Double Hydroxides on Mg-alloy

作　　者：王晓鸽 高克玮[1] 颜鲁春[1] 杨会生[1] 庞晓露[1] WANG Xiaoge;GAO Kewei;YAN Luchun;YANG Huisheng;PANG Xiaolu(School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing 100083,China;Shanxi Engineering Vocational College,Department of Metallurgy and Environmental Engineering,Taiyuan 030009,China)

机构地区：[1]北京科技大学材料科学与工程学院,北京100083 [2]山西工程职业学院冶金与环境工程系,太原030009

出　　处：《中国腐蚀与防护学报》2021年第3期335-340,共6页Journal of Chinese Society For Corrosion and Protection

基　　金：国家重点研发计划(2017YFB0702100);国家自然科学基金(51771026);山西工程职业学院重点课题(yzd-201802)。

摘　　要：利用一步水热法在AZ91D镁合金表面原位制备ZnAl-LDHs薄膜和ZnAlCe-LDHs薄膜,借助X射线衍射仪、扫描电镜、能谱仪和电化学阻抗谱等表征手段,研究Ce对镁合金表面ZnAlCe-LDHs薄膜形貌结构、化学组成及耐腐蚀性能的影响。结果表明,Ce离子加入不改变镁合金表面LDHs鸟巢网状形貌,但增加了薄膜的厚度以及纳米片的尺寸。EIS结果表明,ZnAlCe-LDHs薄膜与ZnAl-LDHs薄膜相比,自腐蚀电位正移0.05 V,腐蚀电流密度降低1~2个数量级,阻抗图中容抗弧半径明显增大,说明加入Ce离子可以增强镁合金的耐腐蚀性能。Thin films of layered double hydroxides(LDHs) such as ZnAl-LDHs and ZnAlCe-LDHs were grown in situ on the surface of AZ91D Mg-alloy via one-step hydrothermal method. The influence of Ce on the morphology, chemical composition and corrosion resistance of ZnAlCe-LDHs films on Mg-alloy was studied by means of X-ray diffractometer(XRD), scanning electron microscope(SEM), EDS and EIS. The results showed that Ce ion had little effect on the network-like morphology of LDHs nests, but increased the thickness of the films and the size of the nanosheets. In comparison with ZnAl-LDHs films,the free-corrosion potential of ZnAlCe-LDHs films shifted positively up to 0.05 V and the corrosion current density was decreased by 1~2 orders. In the impedance diagram, the arc radius was increased obviously, indicating that the addition of Ce ion can enhance the corrosion resistance of ZnAl-LDHs films on AZ91D Mg-alloy.

关 键 词：CE 镁合金 ZnAlCe-LDHs 耐腐蚀性能 机理 

分 类 号：TG174[金属学及工艺—金属表面处理]