摘要
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，氧化膜厚度增大。500℃退火的铝箔，表面微量元素的分布较均匀，腐蚀坑较细小且密度大，比电容较高。而较低温度退火的铝箔，微量元素偏聚在表面的位错周围，铝箔表面出现大量的腐蚀坑，比电容较小。
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.
出处
《热处理》
CAS
2011年第6期39-42,共4页
Heat Treatment
关键词
铝箔
氧化膜
腐蚀
扩散
aluminum foil
oxide film
corrosion
diffusion
