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Sol-enhanced triple-layered Ni–P–TiO2 composite coatings

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Abstract

A novel coating process, TiO2 sol enhanced Ni–P electroless composite coatings on carbon steel, is presented in this paper. Transparent TiO2 sol was added into the electroless plating Ni–P solution at a controlled rate, leading to in situ synthesis of a triple-layered Ni–P–TiO2 composite coating, i.e. the inner, transition and outer layers. The inner layer has a thickness of ~3 μm, mainly composed of Ni and P elements. The transition layer of the coating has a relatively high content of TiO2 with a thickness of ~500 nm and a columnar-structure. The thickness of the outer layer was ~7 μm, with almost evenly distributed Ni, P and TiO2. The hardness and Young’s modulus of the composite coating were greatly improved to ~10 and ~200 GPa, respectively, compared to ~6 and ~110 GPa of the traditional Ni–P coating.

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Acknowledgments

The project is partially funded by New Zealand FRST IIOF grant UOA 0601. The authors would like to thank the technical staff in Department of Chemical and Materials Engineering and the Research Centre for Surface and Materials Science for various assistances.

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Correspondence to Wei Gao.

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Chen, W., Gao, W. & He, Y. Sol-enhanced triple-layered Ni–P–TiO2 composite coatings. J Sol-Gel Sci Technol 55, 187–190 (2010). https://doi.org/10.1007/s10971-010-2231-8

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  • DOI: https://doi.org/10.1007/s10971-010-2231-8

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