Abstract:In order to improve the corrosion resistance of aluminum alloy, a porous anodizing film was prepared on the surface of aluminum by anodizing method, and a magnesium-aluminum hydrotalcite (MgAl-LDH) with layered bimetallic structure was constructed on the surface by the in situ growth method using the anodic oxide film as the skeleton. For the first time, zinc dibenzyl dithiocarbamate (ZBEC) was used to modify the prepared MgAl-LDH film layer, and the morphological composition of the modified MgAl-LDH film layer was studied by SEM, EDS, XPS and ft-IR, and the effects of ZBEC concentration, modification temperature and modification time on the corrosion resistance of the modified film were studied by electrochemical impedance spectroscopy (EIS).The results show that the hydrotalcite film layer is a flaky staggered structure perpendicular to the surface of the matrix, the ZBEC molecule can successfully bind to the MgAl-LDH film layer, and the modified film layer has a good binding force. When the concentration of ZBEC modified solution was 0.03 mol/L, the temperature was 45°C, and the time was 15 min, the EIS low-frequency modulus value of the modified film layer increased from about 7.94×100000 Ω?cm2 to 1.995×1000000 Ω?cm2, indicating that the ZBEC modification improved the corrosion resistance of the MgAl-LDH film layer.