腐蚀条件及稀土含量对铝箔腐蚀形貌和比电容的影响

Study of the electrolytic etching of Ce aluminum foil for high voltage anode of electrolytic capacitor

以0.11 mm厚的不同Ce含量的稀土铝箔和高纯铝箔为研究对象,依次经过抛光前处理、电解抛光、直流电解腐蚀、腐蚀后处理及腐蚀比电容测试和腐蚀形貌观察.结果表明,外加电流、腐蚀液成分和温度以及腐蚀时间是影响铝箔直流电解腐蚀的主要外界因素.在相同外界条件下,Ce含量在一定量范围内,随着Ce含量的增加,腐蚀铝箔的腐蚀坑孔径减小、密度增大、深度加深.添加适量Ce的稀土铝箔的腐蚀比电容值比高纯铝箔的也相应偏高.而且,不同Ce含量的稀土铝箔能获取最大腐蚀比电容的腐蚀工艺也有所不同.

Rare earth aluminum foil of 0. 11 mm thick with different Ce content and high-purity aluminum foil were studied in the following processes of the treatment before polishing, electrolytic polishing, treatment after corrosion and the specific capacitance testing. The results show that the plus current, etching solution composition, temperature and etching time are the main external factors in affecting the DC electrolysis corrosion of aluminum foil. The density and the depth of corrosion aluminum increase with the increase of Ce content under the same external conditions. The con＇osion specific capacitance of rare earth aluminum foil with appropriate Ce content is higher than that of the high purity aluminum foil. Moreover, rare-earth aluminum foil with different Ce content requires different corrosion process to obtain the maximum corrosion specific capacitance.