In order to improve the corrosion resistance of magnesium-lithium (Mg-Li) alloy, a micro-arc oxidation (MAO) ceramic layer was first prepared on LA103Z Mg-Li alloy, and then the MAO coating on LA103Z Mg-Li alloy was sealed by layered double hydroxide (LDH) hydrothermal treatment. The obtained samples were subjected to immersion test in 3.5% NaCl solution for 8 days. The growth characteristics of different coatings before immersion were studied by XRD, SEM and EDS. Morphology and composition of the coatings were observed before and after corrosion. Electrochemical test of the composite film was performed to explore the corrosion resistance and influence of different time on corrosion resistance of MAO/LDH composite film. The results displayed that MAO/LDH composite film have the lowest corrosion current density, the most positive corrosion potential, can effectively protect the substrate from corrosion by NaCl solution, improved long-term corrosion protection, and can considerably improve the corrosion resistance of the alloy. GRAPHICAL ABSTRACT

中文翻译：

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保温时间对LA103Z镁锂合金MAO/LDH复合膜形貌和电化学性能的影响

为了提高镁锂（Mg-Li）合金的耐蚀性，首先在LA103Z Mg-Li合金上制备了微弧氧化（MAO）陶瓷层，然后在LA103Z Mg-Li合金上制备了MAO涂层。通过层状双氢氧化物 (LDH) 水热处理密封。所得样品在3.5% NaCl溶液中浸泡8天。通过XRD、SEM和EDS研究了浸渍前不同涂层的生长特性。在腐蚀前后观察涂层的形态和成分。对复合膜进行电化学测试，探讨不同时间对MAO/LDH复合膜耐腐蚀性能的影响。结果表明，MAO/LDH复合膜的腐蚀电流密度最低，最正的腐蚀电位，能有效保护基体免受NaCl溶液腐蚀，提高长期腐蚀保护，可显着提高合金的耐腐蚀性能。图形概要