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在Ce-Mn稀土钝化液中添加Cl-作为促进剂,以6063铝合金为基体制备了Ce-Mn转化膜。分别采用扫描电镜(SEM)和能谱仪(EDS)研究了转化膜的表面形貌及元素组成,并采用硫酸铜点滴腐蚀实验、动电位极化曲线以及电化学阻抗谱(EIS)研究了Ce-Mn转化膜的耐蚀性。结果表明,Ce-Mn转化膜主要由Ce、Mn、O等元素组成,往稀土钝化液中添加Cl-可使膜层更平整、致密,转化膜的平均耐点滴时间从50s提高至100s,在NaCl质量分数为3.5%的腐蚀介质中的腐蚀电流密度明显降低,转化膜极化电阻增大,铝合金的耐蚀性显著提高。
Ce-Mn rare earth passivation solution was added as a promoter Cl-6063 aluminum alloy as the base prepared Ce-Mn conversion coating. The surface morphology and elemental composition of the conversion coating were investigated by scanning electron microscopy (SEM) and energy dispersive spectrometer (EDS), respectively. The corrosion resistance of Ce -Mn corrosion resistance of the conversion coating. The results show that the Ce-Mn conversion coating mainly consists of Ce, Mn, O and other elements. Adding Cl- into the rare earth passivation solution can make the film more smooth and compact. The average drop-off time of the conversion coating increases from 50s to 100s, The corrosion current density in the corrosion medium with NaCl mass fraction of 3.5% is obviously reduced, the polarization resistance of the conversion coating increases, and the corrosion resistance of the aluminum alloy is remarkably improved.