【摘要】 观察了经400℃真空退火保温1 h后分别随炉冷却和空冷的低压铝箔表面的电化学腐蚀结构,检测相应的比电容,利用二次离子质谱仪检测了铝箔表面区域Mg、Si、Cu微量元素的分布。结果显示,在炉冷的条件下,微量元素在铝箔表面的浓度比空冷条件下的高,且分布比较均匀。在空冷条件下,微量元素更容易偏聚在表面的轧制纹、晶界等缺陷处,使箔样在轧制纹处出现不均匀腐蚀结构,不利于比电容的提高。更多还原

【Abstract】 The surface electrochemical corrosion structures of aluminum foils for low voltage electrolytic capacitor,observed after being annealed at 400 ℃ for 1h followed by furnace cooling and air cooling respectively.The specific capacity of the etching foils was measured,and the distribution of microelements Mg,Si and Cu in the surface layer was determined by secondary ion mass spectrometer.The results show that the microelement concentration in the surface layer is higher and its distribution is more uniform after furnace cooling than that after air cooling.Furthermore,the microelements are segregated more easily around the scribed rolling striations and grain boundary after air cooling,which results in inhomogeneous corrosion and low specific capacity.更多还原