微量Sn对高压阳极铝箔再结晶织构的影响

Influence of Micro-additive Sn on Recrystallization Texture of High Voltage Anode Aluminum Foil

采用织构定量检测、背散射电子衍射技术(EBSD)微取向分析等手段研究了微量Sn对高压电解电容器阳极铝箔立方织构的影响。结果表明,铝箔的再结晶织构主要由立方织构及R织构构成,两者的相对强弱随Sn含量有规律地变化,当Sn含量从0.0001 wt%提高到0.001 wt%时,在520℃×2 h退火条件下铝箔立方织构含量可达到95%以上,而R织构比例较小。Sn含量过高时,经520℃长时间加热有可能诱发晶粒异常长大,降低立方织构含量。因此,Sn作为环保型代替铅的微量元素可以确保高压阳极铝箔96%以上的立方织构占有率。

The influence of micro-additive Sn on the cube texture of high voltage anode aluminum foil used in electrolytic capacitor was investigated based on the quantitative texture analysis and EBSD micro-orientation analysis. The results show that the recrystallization texture of the aluminum foil is formed mainly cube texture and R texture, and relative content of both textures varies with Sn content regularly：when Sn content is increased from 0.0001 wt% to 0. 001 wt% ,the cube texture in the foils reaches to over 95% under annealing at 520℃ for 2 h,while the R texture intensity is lower. When Sn content is much too higher, the cube texture component is lowered because of abnormal growth of the grain induced under the annealing at 520℃ for long time. Thus Sn can be assumed as an ecological element substituting Pb to ensure over 96% volume fraction of cube texture in the high voltage aluminum foil.