Research On The Microstructure And Texture Of High Voltage Anode Aluminum Foil During Rollinga Nd Annealing Treatment

The high voltage anode aluminum foil is the key material for aluminum electrolytic capacitor, for which the foil was made from three-tier solution electrolysis of high purity aluminum in our country by now. The influence of hot rolling, cold rolling and recrystallization annealing on microstructure and texture in segregation and three-tier solution electrolysis high purity aluminum was researched in the present paper, referring the fully-fledged technology for three-tier solution electrolysis high purity aluminum.The influence of chemical composition and making techniques on the Cube texture was introduced firstly in this paper, including the key elements. The polarized light optical microstructure and global texture of segregation high purity aluminum(B) with diffenent hot rolling reductions, three-tier solution electrolysis high purity aluminum(LG5) hot rolled plate and360℃×2h pre-annealed plate as well as the cold rolled plate of both kinds materials were observed by polarizing microscope and XRD technique. The following conclusions were obtained:the absolute reduction in thickness plays an important role in microstructure and texture; the pre-annealing could be omitted if the the finished temperature of hot rolling was high enough; the insulation process between rolling and high finished temperature of hot rolling were good for improving Cube texture; the hot-rolled microstructure influence the cold-rolled microstructure significantly.The98.4%cold rolled0.11mm foil of segregation high purity aluminum and pre-annealed LG5which experienced different additional annealings was observed by quantitative microscopy; the cold rolled F-P-LG5which experienced low and high heating speed recrystallization annealing was observed by XRD and EBSD. The following conclusions were obtained:the additional annealing promote the Cube texture in F-P-LG5, but affect the grain size in F-B7.0and F-P-LG5insignificantly. The grain size in F-B7.0is larger than that in F-P-LG5; the recrystallized Cube texture is more in F-B7.0when heated speedily than slowly, while the recrystallized Cube texture is more in F-P-LG5when heated slowly than speedily; the Cube texture in F-P-LG5is able to increase even recrystallized at500℃for1h when low speed heated, but the Cube texture in F-P-LG5will not increase when high speed heated for60s; the grain in foil with low heating speed grows normally, but the grain in foil with high heating speed grows abnormally; the Cube grain nucleating preferentially and the Cube grain shows little40°<111> orientation relationship with S grain.