Relationship between Trace Mn and the Pitting Behavior of Aluminum Foil Used for High Voltage Electrolytic Capacitors

摘要:

研究了微量锰元素添加对高压电解电容器阳极用铝箔的点蚀行为以及腐蚀箔性质的影响。使用二次离子质谱仪分析了轧制及退火铝箔中锰的元素分布。结果表明，锰在铝箔中的深度分布随着锰含量的增加而变化，但退火后铝箔中形成的立方织构的体积分数保持稳定。随锰含量增加，锰在退火铝箔表面的偏聚趋势增强。在相同的加电腐蚀条件下，腐蚀后锰含量高的铝箔表面具有更高密度的方形点蚀孔，并且并孔更少，点蚀孔分布更加均匀。在所研究的范围内 (2.3 ~ 14.7 μg/g)，在520 V形成的腐蚀箔的比电容随锰含量的增加而提高

Abstract:

The effect of Mn addition in aluminum anode foils for high voltage electrolytic capacitors on the pitting behavior as well as the properties of the etched foils was studied. The Mn distribution in the aluminum foils which are processed with the same rolling and annealing condition was characterized by secondary ion mass spectrometer (SIMS). The results show that the distribution of Mn along the depth of the foil varies with the addition of Mn, while the volume fraction of the cube texture keeps stable. The SIMS results also show that the segregation tendency of Mn onto the foil surface becomes stronger with the increasing of Mn content. The square corrosion pits on the foils with higher Mn content after etching on the same condition are denser and more homogeneous. Also, the specific capacitance of the etched foils after forming at 520 V increases with the increase of Mn content in the range from 2.3 μg/g to 14.7 μg/g