Heat treatment of ultrasonic electrodeposited Ni-W/ZrO2 nanocomposites

Metal matrix composite (MMC) coatings of zirconium oxide (ZrO2) in nanocrystalline Ni-W alloy were obtained by ultrasound assisted direct current electrodeposition from aqueous plating electrolyte. In the present study, effects of the heat treatment (in the range of 400 °C–800 °C, in argon atmospher...

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Bibliographic Details
Published in:	Surface & coatings technology Vol. 393; p. 125779
Main Authors:	Beltowska-Lehman, E., Bigos, A., Szczerba, M.J., Janusz-Skuza, M., Maj, L., Debski, A., Wiazania, G., Kot, M.
Format:	Journal Article
Language:	English
Published:	Lausanne Elsevier B.V 15-07-2020 Elsevier BV
Subjects:	Argon Coated electrodes Coatings Diffusion coating Diffusion layers Direct current Electrochemical deposition Grain size Heat treating Heat treatment Mechanical properties Metal matrix composites Microstructure Microstructure transformation Morphology Nanocomposites Ni-W/ZrO2 nanocomposites Nickel base alloys Phase separation Substrates Tribology Wear and corrosion resistance Zirconium dioxide Zirconium oxides Electrochemical deposition Heat treatment Microstructure transformation Ni-W/ZrO2 nanocomposites Wear and corrosion resistance
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Summary:	Metal matrix composite (MMC) coatings of zirconium oxide (ZrO2) in nanocrystalline Ni-W alloy were obtained by ultrasound assisted direct current electrodeposition from aqueous plating electrolyte. In the present study, effects of the heat treatment (in the range of 400 °C–800 °C, in argon atmosphere) on the microstructure and physicochemical properties of hard Ni-W/ZrO2 coatings deposited on steel substrates were investigated. It was found that thermal treatment considerably affected the microstructure of Ni-W/ZrO2 coatings, including phase compositions, surface morphology and grain size. Microstructure features of annealed composite coatings were correlated to tribological and mechanical properties. A significant improvement in hardness (12 GPa) and wear index (0.56 mm3/Nm) of Ni-W/ZrO2 nanocomposites was achieved by thermal treatment at 500 °C compared to as-deposited coatings (8 GPa and 1.5 mm3/Nm, respectively). At higher temperature (about 600 °C), a tendency towards phase separation was observed and iron diffusion from the substrate to the composite coating layer became evident. •Ni-W/ZrO2 nanocomposite was electrodeposited on ferritic steel substrates.•The optimal temperature range for composite coating annealing was determined.•ZrO2 nanoparticles induce stabilisation of grain growth to elevated temperatures.•Grain boundary relaxation results in strengthening contribution in the composites.•Heat treated composite coatings show enhanced mechanical and corrosion properties.
ISSN:	0257-8972 1879-3347
DOI:	10.1016/j.surfcoat.2020.125779