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中南大学学报(自然科学版)

Journal of Central South University

第41卷    第4期    总第194期    2010年8月

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文章编号:1672-7207(2010)04-1315-06
退火工艺对高压阳极铝箔发孔均匀性的影响
陈明安1,肖源泓1,张新明1,林林2,卢敬华2,周仁良2

(1. 中南大学 材料科学与工程学院,湖南 长沙,410083;
2. 西南铝业(集团)有限责任公司,重庆,401326
)

摘 要: 采用金相显微镜、扫描电镜研究不同退火工艺处理铝箔在盐酸硫酸腐蚀体系中表面腐蚀发孔的均匀性和表面形貌特征,用二次离子质谱仪分析铝箔表面Fe,Si,Cu和Mg等微量元素沿深度方向的分布。研究结果表明:退火工艺可以改变铝箔微量元素的表面聚集形式,从而改变腐蚀发孔率和发孔均匀性;在500 ℃退火时,Cu元素在表面富集太少,表面腐蚀发孔不均匀;在575 ℃退火时,铝箔表面富集了足够的微量元素,发孔面积明显增加。在二级退火方式下,各种微量元素表面聚集都很少,发孔率低。升温速度和冷却速度对铝箔内微量元素的聚集也有一定程度的影响。

 

关键字: 铝箔;发孔;退火;微量元素

Influence of annealing on pitting uniformity of aluminum foil for
 high voltage electrolytic capacitor
CHEN Ming-an1, XIAO Yuan-hong1, ZHANG Xin-ming1, LIN Lin2, LU Jing-hua2, ZHOU Ren-liang2

1. School of Materials Science and Engineering, Central South University, Changsha 410083, China;
2. Southwest Aluminum (Group) Limited Company, Chongqing 401326, China

Abstract:The influence of the annealing of the high voltage aluminum foil on the pitting uniformity and the morphological features after etching in mixed solution of HCl and H2SO4 was studied by the optical micrograph and the scanning electron microscope (SEM). The distribution of trace elements such as Fe, Si, Cu and Mg in the surface layer was measured by secondary ion mass spectrometer. The results show that the annealing has obvious effects on the pitting uniformity and the morphology of aluminum foil, due to the influence of the annealing on the distribution of trace elements in the surface layer of aluminum foil. Due to the lack of Cu in the surface layer, the sample annealed at 500 ℃ is pitted unevenly. A quantity of trace elements are accumulated in the surface layer of the sample annealed at 575 ℃. After two-step annealing, only few trace elements are diffused to the surface layer. The heating rate and cooling rate also influences the distribution of trace elements in the surface layer of aluminum foil.

 

Key words: aluminum foil; pitting; annealing; trace element

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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