铈盐对铝合金硼酸_硫酸阳极氧化膜封闭效应_王帅星.pdfVIP

第 22 卷第 4 期 中国有色金属学报 2012 年 4 月 Vol.22 No.4 The Chinese Journal of Nonferrous Metals Apr. 2012 文章编号：1004-0609(2012)04-1132-10 铈盐对铝合金硼酸−硫酸阳极氧化膜的封闭效应 王帅星，赵 晴，杜 楠，邵志松，舒伟发，陈庆龙 (南昌航空大学 轻合金加工科学与技术国防重点学科实验室，南昌 330063) 摘 要：将铝合金硼酸−硫酸阳极氧化膜浸入铈盐转化液中进行封闭。采用交流阻抗谱技术研究各封闭参数对 氧化膜耐蚀性的影响，比较了不同方法封闭的氧化膜的耐蚀性差异。结果表明：将硼酸−硫酸阳极氧化试样浸入 30 ℃的铈盐转化液(5 g/L Ce(NO ) +0.5% H O ) 中处理30 min 后，多孔层电阻 R 大幅增加，且腐蚀电流密度降低 3 3 2 2 p 1 个数量级，耐蚀性明显优于沸水封闭氧化膜的，也稍优于稀铬酸封闭氧化膜的耐蚀性。结合 EDS 分析表明：铈 盐转化封闭后硼酸−硫酸阳极氧化膜的外表面形成了一层完整致密的铈盐转化膜，多孔层内也充满了铈的封闭产 物，二者的协同作用几乎完全封住了硼酸−硫酸阳极氧化膜的孔隙，从而有效地提高了氧化膜的耐蚀性。 关键词：硼酸−硫酸阳极氧化膜；铈盐转化封闭；交流阻抗谱；多孔层；耐蚀性 中图分类号：TG174.451 文献标志码：A Sealing effect of cerium salt on boric-sulfuric acid anodic film of aluminum alloy WANG Shuai-xing, ZHAO Qing, DU Nan, SHAO Zhi-song, SHU Wei-fa, CHEN Qing-long (National Defence Key Discipline Laboratory of Light Alloy Processing Science and Technology Institute, Nanchang Hangkong University, Nanchang 330063, China) Abstract: The boric-sulfuric acid anodic (BSAA) film on aluminum alloy was sealed by cerium salt conversion solution. The effects of sealing parameters on the corrosion resistance of BSAA film were researched through electrochemical impedance spectroscopy (EIS), while the corrosion resistance of anodic films sealed by different methods was studied. It is found that the resistance of porous layer increases significantly, the corrosion resistance is improved greatly and the corrosion current density is re