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Sealing Effect of KAl(SO4)2 Solution on the Corrosion Resistance of Anodized Aluminum Alloy

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Abstract

The 2024 anodized aluminum alloy film was sealed by KAl(SO4)2 solution and the effect of sealing on corrosion resistance was investigated by means of potentiodynamic polarization curves, electrochemical impedance spectroscopy, and X-ray photoelectron spectroscopy. The experimental results show that the optimal parameters for KAl(SO4)2 sealing are 35 °C, with the pH value of 8, the concentration of 8 g/L, and the sealing time of 3 min. The corrosion resistance of the KAl(SO4)2 sealed sample can be significantly improved than that of unsealed one, and is obviously superior to that of the conventional hydrothermal sealed sample. Furthermore, X-ray photoelectron spectroscopy demonstrates that more Al(OH)3 will be formed in the process of KAl(SO4)2 sealing, which will shrink the diameter of the microporous and therefore results in the excellent corrosion resistance.

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Funding

Funded by the National Natural Science Foundation of China (No. 12175107) and the Natural Science Foundation of Nan**g University of Posts and Telecommunications (No.NY220030)

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Authors and Affiliations

  1. School of Electrical Engineering, Nan**g Vocational University of Industry Technology, Nan**g, 210023, China

    Peng Dong

  2. Crystal Physics Research Center, Nan**g University of Posts and Telecommunications, Nan**g, 210023, China

    Jie Cheng  (程杰)

  3. College of Electronic and Optical Engineering & College of Microelectronics, Nan**g University of Posts and Telecommunications, Nan**g, 210023, China

    Jie Cheng  (程杰)

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  1. Peng Dong
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Correspondence to Jie Cheng  (程杰).

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Dong, P., Cheng, J. Sealing Effect of KAl(SO4)2 Solution on the Corrosion Resistance of Anodized Aluminum Alloy. J. Wuhan Univ. Technol.-Mat. Sci. Edit. 37, 104–109 (2022). https://doi.org/10.1007/s11595-022-2505-3

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  • DOI: https://doi.org/10.1007/s11595-022-2505-3

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