(中南大学 材料科学与工程学院， 长沙 410083)
摘 要: 采用扫描电子显微镜、 透射电镜分析和腐蚀量试验, 研究了高温退火对铝箔第二相形貌及分布和对阴极箔腐蚀性能的影响。 结果表明： 3003合金中第二相粒子呈条状时, 其周围基体中的位错密度分布不均, 尖角部位位错密度高, 成为优先腐蚀的区域, 导致阴极箔腐蚀形貌不均, 易发生剥落腐蚀； 第二相粒子呈球状且弥散分布时, 阴极箔的腐蚀均匀性好, 无剥落腐蚀； 在630℃高温下退火, 第二相发生溶解, 并在空冷时重新析出, 重新析出的第二相数目减少, 形状细小且弥散分布在基体中, 从而提高了铝箔的抗腐蚀性能和腐蚀均匀性。 630℃退火4h为最佳工艺。
关键字: 阴极铝箔； 高温退火； 腐蚀性能
（School of Materials Science and Engineering,
Central South University, Changsha 410083, China）
Abstract:The effects of high temperature annealing on the morphology and distribution of second phases and on the corrosion property of cathode aluminium foil were investigated by means of mass loss experiment, SEM and TEM. The results show that when the second phase particle has high aspect ratio, the dislocation density in the sharp corner region is very high, so the corrosion of the matrix near this region is preferential and the denudation will take place easily; when the second phase particle is spherical and is distributed dispersedly, the corrosion of cathode aluminium foil is uniform and the denudation will not take place. While the foil is annealed at high temperature, the second phases have small aspect ratio and distribute dispersedly. Therefore, the corrosion resistance and the corrosion uniformity of cathode aluminium foil can be improved by annealing at 630℃ for 4h.
Key words: electrolytic capacitor cathode foils； annealing； corrosion property
