Fast Etching Preparation Technique for Al Electrode Foil in Al Electrolytic Capacitor

XU Shanna; GAO Mei; WANG Haili; WANG Liqiang; HUI Rui

doi:10.11973/fsyfh-202211007

Corrosion & Protection > 2022 > 43(11): 35-41. > DOI: 10.11973/fsyfh-202211007

XU Shanna, GAO Mei, WANG Haili, WANG Liqiang, HUI Rui. Fast Etching Preparation Technique for Al Electrode Foil in Al Electrolytic Capacitor[J]. Corrosion & Protection, 2022, 43(11): 35-41. DOI: 10.11973/fsyfh-202211007

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Fast Etching Preparation Technique for Al Electrode Foil in Al Electrolytic Capacitor

School of Materials Science and Engineering, Xi'an Shiyou University, Xi'an 710065, China

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Received Date: December 04, 2020

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Abstract

Aluminum electrode foil was prepared through fast etching method. The morphology and distribution of tunnel holes in the aluminum foil were observed by scanning electron microscopy (SEM). The effects of Cl^- content in etching solution for creating pits, shielding coefficient and total current on the specific capacitance of the aluminum foil were analyzed. The results showed that with the increase of the Cl^- content in etching solution for creating pits, shielding coefficient and total current, the specific capacitance of the aluminum electrode foil increased firstly and then decreased. Under the conditions of Cl^- concentration of 0.9 mol/L, shielding coefficient of 0.4 and total current of 1 400 A, the prepared aluminium foil had high proportion of single pores, large and uniform pore length, and reasonable pore distribution, so its specific capacitance reached the maximum value of 0.818 μF/cm².
- fast etching,
- aluminum electrode foil,
- shielding coefficient,
- capacitance

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