铝电解电容器高压电子箔点蚀机理的研究

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材料工程 ›› 2012, Vol. 0 ›› Issue (5) : 15-19.

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铝电解电容器高压电子箔点蚀机理的研究

王志申¹, 何业东², 孙志华¹, 刘明¹, 张晓云¹, 陆峰¹

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Pitting Mechanism for Aluminum Electrolytic Capacitor High Voltage Foil

WANG Zhi-shen¹, HE Ye-dong², SUN Zhi-hua¹, LIU Ming¹, ZHANG Xiao-yun¹, LU Feng¹

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摘要

采用极化曲线和场发射扫描电镜等方法，研究了铝电解电容器高压电子箔在高温强酸性溶液中的点蚀机理。结果表明：在开路状态下铝光箔在硫酸盐酸发孔溶液中可以产生点蚀，测到自腐蚀电位就是点蚀电位；形成隧道孔后，阳极极化曲线出现点蚀电位，且点蚀过电位与隧道孔长度之间存在线性关系。根据点蚀的微电池模型及其在阳极极化下微电池的腐蚀极化图，提出产生上述现象的原因是阳极极化时带孔铝箔的表面由阴极向阳极转变，其转变的临界点即所测到的点蚀电位。

Abstract

Pitting mechanism for aluminum electrolytic capacitor high voltage foil in strong acidic solution was investigated by means of polarization curve and scanning electron microscopy(SEM). The results indicate that pitting can generate on the surface of Al foil under open circuit, and its corrosion potential measured is pitting potential. Pitting potential appears on the polarization curves of Al foil with tunnel pits, and there is linear relationship between the pitting over-potential and the tunnel length. According to micro-cell model of pitting and the corrosion polarization diagrams of micro-cell, it is thought that the surface of Al foil with tunnel pits transforms from cathode to anode during anodic polarization, and the critical point of the transformation is the measured pitting potential.

导出引用

王志申, 何业东, 孙志华, 刘明, 张晓云, 陆峰. 铝电解电容器高压电子箔点蚀机理的研究[J]. 材料工程, 2012, 0(5): 15-19

WANG Zhi-shen, HE Ye-dong, SUN Zhi-hua, LIU Ming, ZHANG Xiao-yun, LU Feng. Pitting Mechanism for Aluminum Electrolytic Capacitor High Voltage Foil[J]. Journal of Materials Engineering, 2012, 0(5): 15-19

参考文献

［1］王银华，杜国栋，许金强，等．中高压铝电解电容器阳极箔研究进展［J］．电子元件与材料，2006，25(6)：1-5．
［2］XU You-long, MENG Zhong-yan, CAO Wan-zhen. On the etching mechanism of surface area enlarging of aluminum foils used as high-voltage electrolytic capacitors anodes［J］. Journal of Xi’an Jiaotong University, 1995, 29(1): 15-19.
［3］肖占文，杨邦朝．高纯铝箔电解腐蚀扩面机理研究进展［J］．电子元件与材料，1997，16(6)：1-11．
［4］ALWITT R S, UCHI H. Electrochemical tunnel etching of aluminum［J］. Journal of the Electrochemical Society, 1984, 131(1): 13-17.
［5］SZKLARSKA-SMIALOWSKA Z. Pitting corrosion of aluminum［J］. Corrosion Science, 1999, 41(9): 1743-1767.
［6］徐丽新，胡津，耿林，等．铝的点蚀行为［J］．宇航材料工艺，2002，(2)：21-24．
［7］MCCAFFERTY E. Sequence of steps in the pitting of aluminum by chloride ions［J］. Corrosion Science, 2003, 45(7): 1421-1438.
［8］THIERRY M, KURT R H. Atomic force microscopy study of anodic etching of aluminum［J］. Journal of the Electrochemical Society, 2001, 148(2): 101-109.
［9］肖占文．电容器铝箔交流腐蚀扩面机理研究［D］．成都：电子科技大学，1999．
［10］于福洲．金属材料的耐腐蚀性［M］．北京：科学出版社，1982．
［11］曹楚南．腐蚀电化学［M］．北京：化学工业出版社，1994．
［12］杨邦朝，肖占文．预处理对铝箔电蚀特性的影响［J］．电子元件与材料，1997，16(3)：1-9?/p>