Pitting Behavior of Aluminum Foil during Alternating Current Etching in Hydrochloric Acid Containing Sulfate Ions
Resource
Journal of The Electrochemical Society 153 (1): C51-C56
Journal
Journal of The Electrochemical Society
Journal Volume
153
Journal Issue
1
Pages
-
Date Issued
2006
Date
2006
Author(s)
Lin, C. S.
Li, W. J.
Abstract
Sulfate ions in sodium chloride solutions effectively enhance the capacitance of aluminum foils etched with direct current. This study explored the effects of sulfate ions on pitting behavior of aluminum foils for low-voltage electrolytic capacitor during etching with alternating current. Experimental results indicate that the presence of sulfate ions in hydrochloric acid reduced the loss of aluminum due to undermining by the cubic pits. Furthermore, sulfate ions adsorbed on the aluminum surface increased the breakdown potential of the surface film and led to passivation of the existing pits. Consequently, the aluminum foil etched in the solution with the addition of sulfate ions displayed a more uniform pitted structure than that etched in the solution solely composed of hydrochloric acid. © 2005 The Electrochemical Society. All rights reserved.
Other Subjects
Breakdown potential; Direct current; Low-voltage electrolytic capacitors; Sulfate ions; Capacitance; Electrolytic capacitors; Etching; Hydrochloric acid; Ions; Sodium chloride; Solutions; Sulfate minerals; Thin films; Aluminum foil
Type
journal article
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