热处理对铝箔氧化膜和比电容的影响

对铝箔分别在300℃、400℃和500℃进行0.5h、1h和2h真空退火.测定了铝箔的氧化膜厚度和比电容,并用扫描电子显微镜观察了退火铝箔的腐蚀形貌.结果表明,在400℃退火的铝箔氧化膜最薄,300℃退火的居中,500℃退火的最厚.在300℃退火时,随着保温时间的延长,铝箔的氧化膜厚度减小；而在400℃和500℃退火时...

Effect of Heat Treatment on Oxide Film and Specific Capacity of Aluminum Foil

Oxide film thickness and specific capacity of aluminum foils were measured after vacuum annealing at 300 ℃ , 400℃, and 500 ℃ for 0.5 h, 1 h and 2 h respectively, and surface corrosion pattern was observed under SEM, too. The results show that after being separately annealed at 400℃,300 ℃ and 500 ℃, the oxide films of aluminum foil are correspondingly thin, slightly thicker and the thickest. The thickness of oxide film reduces with the prolongation of annealing time at 300 ℃, but increases with the prolongation of annealing time at 400℃ or 500℃. For aluminum foil annealed at 500 ℃, trace elements are uniformly distributed in the surface with fine and dense etch-pits, resulting in greater specific capacity. Furthermore, when annealed at lower temperatures, trace elements will accumulate around dislocations of surface of the aluminum foil, causing a number of etch-pits present on the aluminum foil surface and a decrease in specific capacity.