目的 通过在Zr-Ti基础成膜液中添加适宜的氧化剂，获得均匀致密的陶化膜，提高膜层对AZ80镁合金的保护性。方法 通过盐雾试验和SEM观察的结果，筛选出最佳的成膜液体系。通过测试陶化膜在3.5%NaCl溶液中的极化曲线，选出最佳的成膜液pH和成膜时间。利用XRD和XPS对膜层物相组成进行分析。通过盐雾和电化学试验对膜层的耐蚀性进行表征。结果 当基础成膜液中添加氧化剂KMnO4和NH4VO3的质量浓度比为3∶1、转化液pH为2.5、成膜时间为3.5 min时，制备出的陶化膜均匀、致密，膜层主要由ZrO2、TiO2、MgO、MgF2、V2O3组成。氧化剂的添加抑制了析出相上过快析氢反应对成膜的不良影响，实现了膜层的均匀沉积。陶化膜将AZ80镁合金的耐中性盐雾时间从4 h提高到48 h。结论 添加适宜氧化剂的Zr-Ti系陶化膜可以显著提高AZ80镁合金的耐蚀性。

This work aims to obtain a uniform and dense ceramic conversion coating by adding a suitable oxidant to the Zr-Ti basic coating-forming solution and improve the corrosion resistance of AZ80 magnesium alloy. The optimal bath solution was obtained based on the results of salt spray tests and SEM observation; the optimal pH and treatment time were selected according to the polarization curves of the ceramic conversion coating in 3.5%NaCl solution; XRD and XPS were used to analyze the chemical composition of the coating; the corrosion resistance was characterized by salt spray and electrochemical tests. When the mass concentration ratio of the oxidants of KMnO4 and NH4VO3 in the basic bath solution was 3∶1, the pH of the bath solution was 2.5, the treatment time was 3.5 min, and the coating was uniform and dense, which was mainly composed of ZrO2, TiO2, MgO, MgF2 and V2O3. The addition of the oxidants can suppress the adverse effect of the excessively fast hydrogen evolution reaction on the precipitation phases during the coating formation process, and realize the uniform deposition of the coating. The ceramic conversion coating increasess the salt spray resistance time of AZ80 magnesium alloy from 4 h to 48 h. The Zr-Ti ceramic conversion coating with suitable oxidants can significantly improve the corrosion resistance of AZ80 magnesium alloy.