Abstract
In this report, hybrid silica sol–gel coating was prepared using Ce(NO3)3 (Sol-Ce) as catalyst. Structure, surface morphology and anticorrosion ability of Sol-Ce solution/coating were studied by infrared spectroscopy (IR), scanning electron microscopy, energy dispersive spectrometer (EDS), potentiodynamic scan (PDS) and electrochemical impedance spectroscopy (EIS). IR results showed that Ce(NO3)3 had a stronger influence on reactivity of alkoxysilane. EDS results revealed that the fraction of Fe in Sol-Ce coating was significantly lower than regular acid-catalyzed hybrid silica sol–gel coating (Sol-Ac) and Sol-Ac with Ce(NO3)3-doped coating (Sol-Ac/Ce). The results of PDS and EIS demonstrated that Sol-Ce coating had better anticorrosion ability than Sol-Ac and Sol-Ac/Ce on carbon steel. The enhanced anticorrosion performance of the Sol-Ce coating might result from the following two reasons: (a) Ce(NO3)3 as a catalyst could alleviate the negative effects of low pH with using acid catalyst (dissolution of carbon steel) and (b) Ce(NO3)3 could impede corrosion of carbon steel as corrosion inhibitor.
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Acknowledgments
This work was supported by the NSFC (51105356), the Zhejiang Provincial Natural Science Foundation (Y4100488), the Ningbo Natural Science Foundation (2011A610160) and the “Outstanding Talent Recruiting Program” (2009A31004) dedicated to Academician Qunji Xue from Ningbo Municipal Government.
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Peng, S., Zhao, W., Zeng, Z. et al. Preparation of anticorrosion hybrid silica sol–gel coating using Ce(NO3)3 as catalyst. J Sol-Gel Sci Technol 66, 133–138 (2013). https://doi.org/10.1007/s10971-013-2976-y
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DOI: https://doi.org/10.1007/s10971-013-2976-y