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Home  >  Journal list  >  MATERIALS TRANSACTIONS  >  Vol.44  No.4 (2003)  >  pp.705-708

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Effect of Sodium Hypophosphite on the Structure and Properties of Electrodeposited Ni-W-P Alloys

Jamil Ahmad1), Katsuhiko Asami1), Akira Takeuchi1) and Akihisa Inoue1)
1) Institute of Materials Research (IMR), Tohoku University

Amorphous and nanocrystalline Ni–W–P alloy films have been prepared by electrodeposition. The effect of sodium hypophosphite in the bath is important in determining the W and P contents of the alloy. The alloys prepared in the bath containing more than about 0.15 mol/L of sodium hypophosphite are only Ni–P alloys containing high P contents (>21% (at)) and no W at all. However, as the sodium hypophosphite content is decreased, the W content in the alloy increases and reaches about 20% (at) with decreasing P content to about 1% (at) at 6×10−4 mol/L of sodium hypophosphite. The alloys containing high P contents are amorphous, while those containing high W contents have a nanocrystalline phase with apparent grain size of 2.3 nm at 20% (at) W content. These nanocrystalline alloys show high hardness values up to about 780 MVH.

nickel-tungsten-phosphorus alloys, electrodeposited, sodium hypophosphite, amorphous, nanocrystalline

Received: December 11, 2002
Accepted: February 26, 2003 , Published online: September 06, 2005
Copyright (c) 2005 The Japan Institute of Metals



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