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Studies on electrodeposited nickel–yttria doped ceria composite coatings

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Abstract

Incorporation of ceria particles into the Ni matrix was found to improve the corrosion resistance of pure Ni coatings. With the aim of further improving the corrosion resistance of Ni-ceria, yttria was doped with ceria and used as distributed phase. About 8-mol% yttria doped ceria (8YDC) particles synthesized by a solution combustion process were dispersed in a nickel sulfamate bath and electrodeposition was carried out to prepare Ni–8YDC composite coatings at various current densities. The microhardness of the composite coatings was determined. Optical microscopy confirmed the incorporation of 8YDC particles into the Ni matrix. Potentiodynamic polarization and electrochemical impedance spectroscopy were used to characterize the corrosion behavior of the Ni–8YDC coatings. Scanning Electron Microscopy (SEM) and Energy Dispersive X-ray Analysis (EDAX) were used to characterize the corroded samples. The results were compared with those for Ni and Ni–CeO2 coatings. The wear behavior of Ni–8YDC was studied. Wear tracks were characterized by MicroRaman Spectroscopy.

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Acknowledgements

The authors gratefully acknowledge financial support received from the CSIR Task force program on “Custom tailored special materials”. The authors thank the Director, NAL for permission to publish this work. The authors also thank Ms. C. N. Bindu for help in carrying out some of the experiments. The authors are thankful to Mr. Siju for the microhardness measurements, Mr. Venkataswamy for the SEM and Dr. Anjana Jain for the XRD measurements.

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Authors and Affiliations

  1. Surface Engineering Division, National Aerospace Laboratories, Post Bag No. 1779, Bangalore, 560 017, India

    S. T. Aruna, V. K. William Grips, V. Ezhil Selvi & K. S. Rajam

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  1. S. T. Aruna
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  2. V. K. William Grips
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  3. V. Ezhil Selvi
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  4. K. S. Rajam
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Correspondence to S. T. Aruna.

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Aruna, S.T., William Grips, V.K., Ezhil Selvi, V. et al. Studies on electrodeposited nickel–yttria doped ceria composite coatings. J Appl Electrochem 37, 991–1000 (2007). https://doi.org/10.1007/s10800-007-9338-9

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  • DOI: https://doi.org/10.1007/s10800-007-9338-9

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