磷酸盐封孔处理对铝合金阳极氧化膜耐蚀性能的影响  

Effect of Aluminum Phosphate Sealing Treatment on Corrosion Resistance of Anodic Oxide Films on Al-alloys

作　　者：刘莉[1] 张鲲[1,2] 骆晓伟 宁淑红 董立新[1] 刘艳[1,2] 陈辉[1,2] 

机构地区：[1]西南交通大学材料科学与工程学院,成都610031 [2]西南交通大学四川省先进焊接及表面工程技术研究中心,成都610031

出　　处：《腐蚀科学与防护技术》2016年第2期129-134,共6页Corrosion Science and Protection Technology

基　　金：国家自然科学基金项目(51201144);中国博士后科学基金项目(2013M542288);中央高校基本科研业务费科技创新项目(SWJTU11CX051)资助

摘　　要：为进一步提高铝合金阳极氧化膜的耐蚀性能,采用磷酸盐对其进行封孔处理。利用电化学阻抗谱(EIS)分析该封孔处理对阳极氧化膜耐蚀性能的影响规律,并与常规沸水封孔和铈盐封孔进行比较。实验结果表明,磷酸盐封孔处理后可在阳极氧化膜表面形成约为15μm厚的致密磷酸盐涂层,与常规沸水和铈盐封孔处理相比,磷酸盐封孔处理的阳极氧化膜具有更好耐蚀性和时效性。该方法可为阳极氧化膜封孔处理提供一种新途径。Anodic oxide films on Al-alloys were sealed by aluminum phosphate to further improve their corrosion resistance. Electrochemical impedance spectroscope（EIS） was used to study the effect of the sealing treatment on corrosion resistance of the anodic oxide films in comparison with those sealed with boiling water and cerium salt solution respectively. The results showed that, the aluminum phosphate coating was formed on the anodic oxide film sealed with aluminum phosphate, and it could provide the anodic oxide film the best corrosion resistance superior to those sealed with boiling water and cerium salt solution. Furthermore, the effectiveness of the aluminum phosphate treatment could last longer than that of sealing treatmants with boling water and cerium salt solution. This method could be a new sealing treatment for anodic oxide film on Al-alloys.

关 键 词：阳极氧化膜 耐蚀性 电化学阻抗 磷酸盐封孔 

分 类 号：TG174.4[金属学及工艺—金属表面处理]