目的 在纯镁表面制备镁铁类水滑石膜，提高其在模拟体液中的耐蚀性。方法 将纯镁基体在Fe2+/CO32–溶液中预处理后，再放入pH为10的碱性溶液中，同时让试样作阳极，施加电流辅助成膜，通过控制电流大小和成膜时间，研究电场对膜层质量的影响规律。利用扫描电子显微镜和X射线衍射仪表征镁铁类水滑石膜的表面形貌和物相组成，通过电化学实验（极化曲线及交流阻抗）研究膜层的耐腐蚀性能。结果 不同电场条件下均在纯镁表面制得镁铁类水滑石膜，随着电流增大，时间延长，膜层质量和耐蚀性呈先提高后下降的变化规律，当电流为50 mA，时间为1 h时，制备的膜层质量和耐蚀性最好。电场环境可有效促进反应的进行，极大地缩短了时间，改善了制备工艺。最佳工艺条件下制备的膜层试样腐蚀电流密度为9.24?10?6 A/cm2，约为纯镁基体（1.09?10?4 A/cm2）的1/10，低频区Z模值约为2410 Ω?cm2，约为基体（668 Ω?cm2）的4倍。结论 采用电场辅助工艺，成功在纯镁表面制得镁铁类水滑石膜。通过此工艺可缩短膜层制备的时间，且制备的膜层可有效提高纯镁基体在模拟体液中的耐蚀性。

The work aims to prepare Mg-Fe hydrotalcite film on the surface of pure magnesium to improve the corrosion re-sistance in simulated body fluids. Pure magnesium matrix was pretreated in the Fe2+/CO32– solution, and then placed in an alkaline solution with a pH of 10, while the sample was used as an anode and the current was applied to assist film formation. The effect of electric field environment on the quality of the film was studied by controlling the current and formation time. The surface morphology and phase composition of the Mg-Fe hydrotalcite film were characterized by scanning electron microscopy and X-ray diffractometric. The electrochemical experiments (potentiodynamic polarization and electrochemical impedance spectroscopy) were conducted to study corrosion resistance of Mg-Fe hydrotalcite film. Mg-Fe hydrotalcite film was prepared on pure magnesium surface under different electric field conditions. As the current increased and the time prolonged, the film quality and corrosion resistance increased first and then decreased. When the current was 50 mA and the time was 1 h, the prepared film had the best quality and corrosion resistance. The electric field environment could effectively promote the reaction, greatly shorten the time and improve the preparation process. The corrosion current density of the sample prepared under the optimum process conditions was 9.24?10?6 A/cm2, which was about 1/10 of the pure magnesium matrix (1.09?10?4 A/cm2). The Z modulus was about 2410 Ω?cm2, which was about 4 times that of the substrate (668 Ω?cm2). The Mg-Fe hydrotalcite film is successfully prepared on the surface of pure magnesium by electric field assisted process. The preparation time of the film can be shortened by this process, and the prepared film layer can effectively improve the corrosion resistance of the pure magnesium matrix in the simulated body fluid.