Yttrium-doped Mg-Al layered double hydroxide films (MgAlY-LDHs) were firstly fabricated by a hydrothermal method on anodized AZ31 and Mg-Y alloys. The structure, morphology, and composition of MgAlY-LDHs were characterized by X-ray diffractometer (XRD), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FT-IR), X-ray fluorescence spectrometry (XRF), backscattered electron spectrometer (BSE), field-emission scanning electronic microscope (FE-SEM), energy dispersive spectrometry (EDS) and glow discharge optical emission spectroscopy (GDOES), respectively. The electrochemical behavior was investigated using polarization curves, electrochemical impedance spectroscopy (EIS), and immersion tests. The results indicated that the Y ions can be successfully intercalated in the MgAl-LDH lamella by isomorphous replacement, which can enhance corrosion protective performance and possess the self-healing ability of coatings. Furthermore, the in-situ growth of ternary LDHs film on high-strength Mg-rare earth (RE) alloys demonstrated the considerable potential of anti-corrosion protection for industrial application. The schematic representation of the growth mechanism and electrochemical behavior of MgAlY-LDHs nanosheet was put forward finally.

首先通过水热法在阳极氧化的AZ31和Mg-Y合金上制备了掺钇的Mg-Al层状双氢氧化物膜（MgAlY-LDHs）。用X射线衍射仪（XRD），X射线光电子能谱仪（XPS），傅里叶变换红外光谱仪（FT-IR），X射线荧光光谱仪（XRF）对MgAlY-LDHs的结构，形态和组成进行了表征。背散射电子光谱仪（BSE），场发射扫描电子显微镜（FE-SEM），能量色散光谱仪（EDS）和辉光放电光发射光谱仪（GDOES）。使用极化曲线，电化学阻抗谱（EIS）和浸没测试研究了电化学行为。结果表明，Y离子可以通过同构置换成功地插入MgAl-LDH薄片中，可以增强防腐性能，并具有涂层的自愈能力。此外，在高强度镁稀土（RE）合金上原位生长三元LDHs膜证明了在工业应用中具有很大的防腐保护潜力。最后提出了MgAlY-LDHs纳米片的生长机理和电化学行为的示意图。