In the present work, a ZnAl layered double hydroxide (LDH) conversion coating was synthesized on 2024-T3 aluminum alloy by a one-step hydrothermal method. For this purpose, the effect of synthesis parameters, including the amount of Zn²⁺ cations and hexamethylenetetramine molecules, on the structural changes were evaluated by using the scanning electron microscopy (SEM) equipped with energy dispersive spectroscopy (EDS) analysis and X-ray diffraction (XRD) spectroscopy. Also, benzimidazole (BI), as corrosion inhibitor of the AA2024-T3, was intercalated into the LDH film structure by an anion-exchange process. The intercalation of BI molecules into the LHD structure was studied using the SEM-EDS and XRD analysis. Furthermore, electrochemical impedance spectroscopy (EIS), potentiodynamic polarization (PD), and electrochemical current noise measurements were employed in 3.5 wt% NaCl solution to assess the protection performance of the LDH coating. The PD test results showed that the LDH conversion coating's polarization resistance increases from 24.05 to 131.1 kΩ/cm² after the intercalation of the BI molecules into the structure of the ZnAl LDH layer. The induction of active protection performance for the LDH film modified with BI molecules was demonstrated through the EIS test results.

在本工作中，采用一步水热法在2024-T3铝合金上合成了Zn Al层状双氢氧化物（LDH）转化膜。为此，合成参数的影响，包括Zn ²⁺的量阳离子和六亚甲基四胺分子在结构上的变化通过配备有能量色散光谱（EDS）分析和X射线衍射（XRD）光谱的扫描电子显微镜（SEM）进行评估。另外，通过阴离子交换法将作为AA2024-T3的腐蚀抑制剂的苯并咪唑（BI）插入LDH膜结构中。使用SEM-EDS和XRD分析研究了BI分子插入LHD结构的过程。此外，在3.5 wt％的NaCl溶液中采用电化学阻抗谱（EIS），电势极化（PD）和电化学电流噪声测量来评估LDH涂层的保护性能。PD测试结果表明，LDH转化膜的极化电阻从24.05提高到131.1kΩ/ cm^{如图2所示}，BI分子插入到Zn Al LDH层的结构中。通过EIS测试结果证明了对用BI分子修饰的LDH膜的主动保护性能的诱导。