Layered double hydroxide (LDH) (Mg-Al and Mg-Al-Co) films were prepared on the surface of LA103Z magnesium-lithium alloy by hydrothermal synthesis method. Corrosion resistance of binary and ternary LDH coatings was studied by comparison. Structures of the two films were characterized using XRD, FTIR, SEM and EDS, and the corrosion resistance of the films was evaluated by polarization curve, EIS, and hydrogen evolution rate during immersion in 3.5 wt% NaCl solution. Results showed that Mg-Al LDH film was tightly bonded to the substrate and had a large number of nanosheets growing perpendicular to the substrate, while Mg-Al-Co LDH film was thinner with a smaller size and fewer nanosheets. Electrochemical test results showed that the polarization resistance of Mg-Al and Mg-Al-Co LDH films was two orders of magnitude higher than that of the substrate. Hydrogen precipitation experiments showed that corrosion resistance of both the films was improved compared to the substrate, and the films played a protective role for the substrate, among which the corrosion resistance of the Mg-Al LDH layer was better than that of the Mg-Al-Co LDH layer.

采用水热合成法在LA103Z镁锂合金表面制备了层状双氢氧化物（LDH）（Mg-Al和Mg-Al-Co）薄膜。通过比较研究了二元和三元LDH涂层的耐腐蚀性能。利用 XRD、FTIR、SEM 和 EDS 对两种薄膜的结构进行了表征，并通过极化曲线、EIS 和在 3.5 wt% NaCl 溶液中浸泡时的析氢速率来评估薄膜的耐腐蚀性。结果表明，Mg-Al-LDH薄膜与基体结合紧密，且有大量垂直于基体生长的纳米片，而Mg-Al-Co LDH薄膜较薄，尺寸较小，纳米片数量较少。电化学测试结果表明，Mg-Al和Mg-Al-Co LDH薄膜的极化电阻比基底高两个数量级。