Effect of Trace Sn on Pitting Behaviors of High Voltage Anode Aluminum Foil

Abstract

Abstract: The effect of trace Sn on the pitting morphology of high voltage anode aluminum foils was investigated. The distributions of microelement Sn, Fe, Si, Cu and Mg in the surface layer of aluminum foils with different Sn content were determined by using a secondary ion mass spectrometer. It was found that the micro-alloyed Sn is enriched at the external surface. The mechanism of pitting behavior of trace Sn on aluminum surface is similar with that of lead. Enrichment of Sn in the surface layer provides large numbers of sites for initiation of pitting corrosion, while pitting sites appeared relatively inhomogenously in the foils without Sn. Sn, as an eco-friendly microelement, can be applied to replace Pb in improving the homogenous pitting behaviors of high voltage aluminum foils, in which the volume fraction of cube texture is not reduced.

Key words: Electrolytic capacitor, Aluminum foil, Sn, Pitting corrosion

Jingbo SONG, Weimin MAO, Hong YANG, Huiping FENG. Effect of Trace Sn on Pitting Behaviors of High Voltage Anode Aluminum Foil[J]. J Mater Sci Technol, 2008, 24(05): 718-722.

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