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Effect of trace tartaric acid on anodizing of etched aluminum foil for high voltage electrolytic capacitor

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Abstract

The effects of the addition of trace amounts of tartaric acid to the boric acid electrolyte on the microstructure and electrochemical performance of anodized aluminum foils with a tunnel etch structure for high voltage electrolytic capacitors are studied with TEM, XRD, EIS, LCR meter and small-current charging. The results show that the high voltage anodized oxide film consists of an inner layer with high crystallinity and an outer layer with low crystallinity. The addition of tartaric acid can effectively promote crystalline anodic oxide formation and obtain a barrier film with a high degree of crystallinity, thereby enhancing the film capacitance and field strength. However, more intrinsic defects such as cavities, slits and voids occur due to severe phase transformation and shrinkage, thereby reducing the film resistance and withstanding voltage.

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Acknowledgments

The authors would like to express their appreciation for the financial support of the Chinese National Nature Science Foundation under Grant 51172102/E020801.

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Authors and Affiliations

  1. Research Institute of Nonferrous Metals, Liaocheng University, Liaocheng, 252059, China

    C. L. Ban & X. Shao

  2. Beijing Key Laboratory for Corrosion, Erosion and Surface Technology, University of Science and Technology Beijing, Beijing, 100083, China

    C. L. Ban & Y. D. He

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  1. C. L. Ban
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  2. Y. D. He
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  3. X. Shao
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Correspondence to C. L. Ban.

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Ban, C.L., He, Y.D. & Shao, X. Effect of trace tartaric acid on anodizing of etched aluminum foil for high voltage electrolytic capacitor. J Mater Sci: Mater Electron 24, 3442–3447 (2013). https://doi.org/10.1007/s10854-013-1268-1

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  • DOI: https://doi.org/10.1007/s10854-013-1268-1

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