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The Effect of Tungsten Content on Nanocrystalline Structure of Ni-W Alloy Electrodeposits

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Abstract:

The effects of tungsten content on the nanocrystalline structure of Ni-W alloy electrodeposits were investigated. Direct current electrodeposition was conducted with various W mole fractions in a nickel sulfate solution containing citric acid as a complexing agent. Current efficiency was an almost constant value of 52% up to W mole fraction of 0.58. However, it was sharply decreased owing to severe H2 evolution with increasing cathode overvoltage at a W mole fraction higher than 0.74. The X-ray diffraction peak was decreased and broadened with increasing W content, and an amorphous pattern appeared clearly at 49 wt.% W. It was confirmed that Ni-W alloy deposit was transformed from crystalline to amorphous structure between 41 and 49 wt.% W. This result was also verified through a TEM analysis.

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Periodical:

Materials Science Forum (Volumes 510-511)

Pages:

1062-1065

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.510-511.1062

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Online since:

March 2006

Authors:

Woon Suk Hwang, Won Seung Cho

Keywords:

Amorphous, Electroplating, Microstructure, Nanocrystalline, Ni-W Alloy

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© 2006 Trans Tech Publications Ltd. All Rights Reserved

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