铝电解电容器用不同工艺腐蚀箔的对比研究

利用金相显微镜分析软质交流腐蚀箔、直交流腐蚀箔及硬质交流腐蚀箔的表面及断面蚀孔形貌,监测腐蚀箔恒电流阳极氧化过程中的升压曲线,并测试腐蚀箔阳极氧化后的比容、漏电流、抗拉强度及折弯次数.结果表明,软质交流腐蚀箔的蚀孔形貌呈灌木状;直-交流腐蚀箔的蚀孔呈乔木和灌木状分布,蚀孔中有部分大而稀疏的隧道孔,扩面倍率最小;而硬质交流腐蚀箔的蚀孔呈蜂窝状,孔洞细密,扩面倍率最大.直-交流腐蚀箔的漏电流最小,硬质交流腐蚀箔的抗拉强度及折弯次数最大.

Comparative research on etched aluminum foils fabricated by different techniques for aluminum electrolytic capacitor

Surface and cross-sectional morphology of etched aluminum foils fabricated by different techniques were observed by metalloseope, voltage-time response of etched aluminum foil during anodizing galvanostatieally was followed, and the specific capacitance, leakage current,tensile strength and bending property were measured. The results show that corrosive pore of soft AC-etehed aluminum foil presents the shrub form distribution;corrosive pore of DC-AC etched aluminum foil presents the complex distribution of arbor and shrub, some large tunnel-pores distribute into corrosive layer, and the surface area increasing factor is least;Corrosive pore of hard AC-etehed aluminum foil presents the sponge structure,and the surface area increasing factor is biggest for close pores. The leakage current through DC-AC etched aluminum foil when anode finishing is least, while the tensile strength and bending property of hard AC-etehed aluminum foil are best.