Oxidation Behaviour of Ni-Cr-Y2O3 Composite Coatings Synthesised by Sol Enhanced Pulse Electroplating

Robert Hoye, Wei Gao

Abstract


The objective of this study was to improve the oxidation resistance of electroplated Ni-Cr coatings by introducing a fine dispersion of yttria (Y2O3) nanoparticles to the coatings. A technique was developed to produce Y2O3 nanoparticles 54(+-)2 nm in size. Electroplating conditions were also investigated and it was found that pulse plating could produce high quality coatings without cracking. The Y2O3 nanoparticles were then co-deposited with Ni-Cr and formed a fine dispersion in the coating. The Ni-Cr-Y2O3 composite coatings had improved oxidation resistance compared with the conventional Ni-Cr coatings. It is believed that this is due to Y2O3 nanoparticles causing finer grains to occur, thereby improving oxide scale adhesion.


Full Text: PDF DOI: 10.5539/jmsr.v1n2p133

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Journal of Materials Science Research   ISSN 1927-0585 (Print)   ISSN 1927-0593 (Online)

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