磷酸中铝阳极氧化及扩孔对膜层的影响  

Morphology and Structure of Anodizing Film on Aluminum Plate Subject to Pore-Enlargement in Phosphoric Acid

作　　者：宋琛[1] 李淑英[1] 

机构地区：[1]大连理工大学化工学院,辽宁大连116012

出　　处：《材料保护》2006年第4期21-22,25,共3页Materials Protection

摘　　要：为进一步了解磷酸扩孔对铝阳极氧化铝膜的影响，将铝在磷酸介质中恒压阳极氧化，把氧化后的铝片放入5％的磷酸溶液中扩孔5—8min，通过扫描电镜（SEM）观测了阳极氧化膜的形貌和结构特征，结果表明：氧化膜上的微孔分布均匀，孔径大小基本相同，平均孔径约为150nm，孔密度约为2．5×10^9个／cm^2，柱状孔之间相互平行。氧化膜经酸液扩孔，可使其孔形由不规则圆形变成规则圆形，随着扩孔时间的延长，阳极氧化膜的孔径呈近似线性增大，但达一定时间后，孔形不再为规则圆形，而且伴有连孔现象出现。因此本试验条件下，扩孔时间以6～7min为宜。Anodizing film was prepared on aluminum plate making use of anodizing at constant voltage in phosphoric acid. The Al plate coated with the anodizing film was then immersed in a diluted phosphoric acid (5%) for 6~8 min to allow the processing of pore-enlargement. The morphology and structure of the anodizing film after the processing of pore-enlargement were analyzed by means of scanning electron microscopy. It was found that, after being treated in diluted phosphoric acid, the tiny pores distributed uniformly in the anodizing film and the enlarged pores had a diameter about 150 nm, with the amount of the pores to be as much as 2.5×10 9/cm 2. Moreover, the pore-enlargement in the dilute phosphoric acid caused the original irregular spheric pores in the film to be transformed to regular spheric ones. The size of the pores almost linearly increased with increasing pore-enlargement duration, but at a certain pore-enlargement duration the pores lost their spheric shape and came into conjunction with each other. The proper pore-enlargement duration was suggested to be 6~7 min.

关 键 词：铝阳极氧化 磷酸 扩孔时间 

分 类 号：TG174.451[金属学及工艺—金属表面处理]