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Sol–gel route to ceria coatings on AA2024-T3 aluminum alloy

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Abstract

The ceria coating was studied as an efficient alternative to the chromate protective coating of aluminum alloys. The environmentally friendly inhibitor of cerium ion was incorporated into the surface coating using Ce(NO3)3 as precursor via a sol–gel route. The coatings were analyzed with FESEM and EDS. The anticorrosion performance evaluation of the coatings was carried out using electrochemical methods and full immersion experiments. Under the conditions of surface pretreatment with 15 wt% NaOH solution for 20 s, a sol reaction time of 2 h and 3–5 times of dip-coating, the uniform ceria coatings with low defect and barrier were successfully synthesized. After the full immersion process, pitting holes containing copper-rich phases were detected on the surface of the uncoated sample. In contrast, such holes were not observed on the coated sample. Furthermore, the I corr values of the coated samples were smaller than that of the uncoated one, which confirms that the coatings provide a considerable protection barrier and promote the anticorrosion performance of aluminum alloys.

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Acknowledgments

Financial supports from the National Natural Science Foundation of China (51401085 and 51202088), Shandong Doctoral Foundation (BS2013CL004), Science and Technology Program of the Higher Education Institutions of Shandong Province (J14LA06), Doctoral Fund (XBS1106) and Research Fund of University of Jinan (XKY1106) are acknowledged.

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Authors and Affiliations

  1. Shandong Provincial Key Laboratory of Preparation and Measurement of Building Materials, School of Materials Science and Engineering, University of Jinan, Jinan, 250022, China

    Min Zuo, Tingting Wu, Kegeng Xu, Shiquan Liu, Degang Zhao & Haoran Geng

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  1. Min Zuo
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  2. Tingting Wu
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Correspondence to Min Zuo.

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Zuo, M., Wu, T., Xu, K. et al. Sol–gel route to ceria coatings on AA2024-T3 aluminum alloy. J Coat Technol Res 12, 75–83 (2015). https://doi.org/10.1007/s11998-014-9621-8

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