铝电解电容器用电极铝箔的快速腐蚀制备工艺

Fast Etching Preparation Technique for Al Electrode Foil in Al Electrolytic Capacitor

通过快速腐蚀方法制备了电极铝箔,采用扫描电镜观察铝箔上隧道孔的形貌及分布,分析了发孔腐蚀液中Cl^(-)含量、屏蔽系数以及总电流对电极铝箔比电容的影响。结果表明:随发孔腐蚀液中Cl^(-)含量、屏蔽系数以及总电流的增大,电极铝箔的比电容均呈先增大后减小的规律;在Cl^(-)浓度为0.9 mol/L、屏蔽系数为0.4、总电流为1400 A条件下,制备得到的铝箔中单孔个数占比较高,孔长度大且均匀,孔分布合理,因此其比电容达到最大值,为0.818μF/cm^(2)。

Aluminum electrode foil was prepared through fast etching method.The morphology and distribution of tunnel holes in the aluminum foil were observed by scanning electron microscopy(SEM).The effects of Cl^(-)content in etching solution for creating pits,shielding coefficient and total current on the specific capacitance of the aluminum foil were analyzed.The results showed that with the increase of the Cl^(-)content in etching solution for creating pits,shielding coefficient and total current,the specific capacitance of the aluminum electrode foil increased firstly and then decreased.Under the conditions of Cl^(-)concentration of 0.9 mol/L,shielding coefficient of 0.4 and total current of 1400 A,the prepared aluminium foil had high proportion of single pores,large and uniform pore length,and reasonable pore distribution,so its specific capacitance reached the maximum value of 0.818μF/cm^(2).