(北京科技大学 材料学系， 北京 100083)
摘 要: 采用立方织构定量检测以及扫描电子显微镜下观察腐蚀结构等手段， 对比了不同微量Mg元素含量的高压电解电容器阳极铝箔在织构和腐蚀结构上的差别， 研究了Mg含量对高压电解电容器阳极铝箔比电容的影响。 分析表明： Mg含量从0.0001%提高到0.0014%时， Mg会更多富集于铝箔表面， 促使腐蚀形成的氧化膜中出现含Mg的复合氧化物微小颗粒， 进而引起腐蚀隧道的侧向发展； 频繁的侧向发展可导致表层腐蚀组织剥落， 进而使铝箔在500V的比电容从7.3×10-3F/m2降低到4.3×10-3F/m2。
关键字: 电解电容器；铝箔； 腐蚀； 镁
high voltage aluminum foil
（Department of Materials, University of Science and Technology Beijing,
Beijing 100083, China）
Abstract:The cube texture and corrosion structure of aluminum anode foil for high voltage electrolytic capacitor containing trace Mg were investigated based on quantitative cube texture analysis and microstructure observation under scanning electron microscope. The effect of Mg content on specific capacity of the foils was also studied. It is deduced that the difference on corrosion structure is related to the content of trace Mg. When Mg content is increased from 0.0001% to 0.0014%, Mg will concentrate severely on the surface layer and will lead to the formation of oxide particles containing Mg. The complex oxide particles can result in development of etching tunnel in side directions. The surface corrosion layer will flake off and the specific capacity of the foils at 500V will be reduced from 7.3×10-3F/m2 to 4.3×10-3 F/m2, if the frequency of the side development of etching tunnel is high enough.
Key words: electrolytic capacitor; aluminum foil; corrosion; Mg
