Effect of acid concentration and current density on DC etching of aluminum electrolytic capacitor foil

Chiu Yi Hung; Ou Bin Lung; Lee Yuoh Lien

Korean Journal of Chemical Engineering, Vol.24, No.5, 881-887, September, 2007

DOI10.1007/s11814-007-0059-x Export Citation

Effect of acid concentration and current density on DC etching of aluminum electrolytic capacitor foil

Chiu Yi Hung^†, Ou Bin Lung, and Lee Yuoh Lien

Department of Mechanical Engineering, National Central University, Chung-Li, Taiwan

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This work studies the effects of acid concentration and current density on etching morphology, microstructure and static capacity of the aluminum foils used in high-voltage electrolytic capacitors. The behavior associated with electrochemical etching was investigated with a potentiostat. The aluminum etching type of DC etching is greatly influenced by the etching potential. The static capacity increased to 0.65 uF/cm2 with 540 V forming voltage by optimization of the etching parameters used in this work.

Keywords:Capacitors;Aluminum Etching;Potential;Current Density

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[2] Bakish R, Border EZ, Kornhass RJ, J. Electrochem. Soc., 109, 791 (1962)

[3] Bakish R, Electrochem. Technol., 6, 192 (1968)

[4] Zheng ZQ, Zhang WB, China Inst. South Inst. Mining Central Metal., 1, 111 (1983)

[5] Suzuki T, Arai K, Shiga M, Nakamura Y, Metall. Trans., 16A, 27 (1985)

[6] Chen HC, Ou BL, Journal of Materials Science: Materials in Electronics., 15, 819 (2004)

[7] Choi JH, Kim SB, Korean J. Chem. Eng., 11(3), 178 (1994)

[8] Kim SJ, Ko JY, Korean J. Chem. Eng., 23(5), 847 (2006)

[9] Hen Z, Weibin Z, Mater. Sci. Eng. B-Solid State Mater. Adv. Technol., B3, 479 (1989)

[10] Osawa N, Fukuoka K, Corros. Sci., 42, 585 (2000)

[11] Lin W, Tu GC, Lin CF, Peng YM, Corrosion Science, 38, 889 (1996)

[12] Hebert K, Alkire R, J. Electrochem. Soc., 135, 2447 (1988)

[13] Zhou Y, Hebert KR, J. Electrochem. Soc., 145, 2100 (1998)