Distribution of Microelements and Their Influence on the Corrosion Behavior of Aluminum Foil  

作　　者：Weimin MAO, Heng JIANG, Ping YANG, Huiping FENG and Yongning YUDepartment of Materials, University of Science and Technology Beijing, Beijing 100083, ChinaProf., Ph.D., 

出　　处：《Journal of Materials Science & Technology》2005年第1期43-46,共4页材料科学技术（英文版）

基　　金：The authors would like to acknowledge the financial supports from the National High Technology Research and Development Program of China(863 program,grant No.2003AA32X170);the Doctoral Foundation of the Eduction Ministry of China(grant No.20040008010).

摘　　要：The distribution of microelement Fe, Si, Cu and Mg in the surface layer of aluminum foil annealed at 300℃ and 500℃ were determined by secondary ion mass spectrometer. The corrosion structure produced by electrochemical etching was also observed. It was found that the Mg concentration at external surface was increased exponentially over the fourth degree and promoted by higher annealing temperature, which will increase the number of corrosion pits inside the large grains, and therefore the specific capacity of the foils for electrolytic capacitors. The similar effects of microelement Fe, Si and Cu were not so strong.The distribution of microelement Fe, Si, Cu and Mg in the surface layer of aluminum foil annealed at 300℃ and 500℃ were determined by secondary ion mass spectrometer. The corrosion structure produced by electrochemical etching was also observed. It was found that the Mg concentration at external surface was increased exponentially over the fourth degree and promoted by higher annealing temperature, which will increase the number of corrosion pits inside the large grains, and therefore the specific capacity of the foils for electrolytic capacitors. The similar effects of microelement Fe, Si and Cu were not so strong.

关 键 词：Electrolytic capacitor Aluminum foil Microelement Corrosion structure 

分 类 号：TG174[金属学及工艺—金属表面处理]