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Effect on Corrosion Resistance of Ce-Rich-Sealed Ni-P Coatings on Cf/Al Composite Surface

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Abstract

In this study, Ni-P coatings and sealing of the coatings by Ce-rich solution on Cf/Al composite surface for enhanced corrosion resistance are investigated. The corrosion resistance of uncoating sample in 3.5 wt.% NaCl solution was investigated and a comparison with Ni-P and Ce-sealed Ni-P coatings is given. Effect of Ce-sealing on Ni-P coating is discussed. The results of electrochemical measurements of corrosion performance of Cf/Al composites show that sealing of Ni-P coatings with Ce-rich solution can improve the corrosion resistance. The Ce-rich-sealed Ni-P coating has higher corrosion resistance than the coating without Ce, and the electroless plated Ni-P coating on composite surface has higher corrosion resistance than the bare sample, as evidenced by EIS and potentiodynamic polarization measurements. The microstructure of the Cf/Al composites and the two kinds of coatings (i.e., Ni-P coating and Ce-sealed Ni-P coating) were examined by scanning electron microscopy, energy dispersive spectroscopy, and transmission electron microscopy. The Ce-sealed Ni-P coatings on Cf/Al composite surface have a total thickness of ~11 μm of which 10 μm is the thickness of the Ni-P coating and ~1 μm is the thickness of the Ce-rich sealing. It shows that the selected area electron diffraction ring pattern of Ce-rich sealing on Ni-P plated composite is consistent with Ce6O11 or CeO2. X-ray photoelectron spectroscopy results show that Ce4+ was the dominant oxidation state for Ce-rich sealing on Ni-P plated composite. The Ce-sealing treatment on Ni-P coating has improved the corrosion resistance over and above the corrosion resistance offered by the Ni-P mono-coating to the bare substrate.

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Acknowledgments

This study was supported by “the Fundamental Research Funds for the Central Universities” (HIT.NSRIF.2009150 and HIT.NSRIF.2011104), “Shandong Provincial Natural Science Foundation” (ZR2011EMM013) and “Promotive research fund for excellent young and middle-aged scientists of Shandong Province” (BS2011NJ002).

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  1. School of Materials Science and Engineering, Harbin Institute of Technology at Weihai, Weihai, 264209, People’s Republic of China

    Chunyu Wang, Huanran Li, Peng Zhang & Hongyun Zhao

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  1. Chunyu Wang
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  2. Huanran Li
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  3. Peng Zhang
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Correspondence to Chunyu Wang.

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Wang, C., Li, H., Zhang, P. et al. Effect on Corrosion Resistance of Ce-Rich-Sealed Ni-P Coatings on Cf/Al Composite Surface. J. of Materi Eng and Perform 22, 624–631 (2013). https://doi.org/10.1007/s11665-012-0297-x

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  • DOI: https://doi.org/10.1007/s11665-012-0297-x

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