Online ISSN : 1347-5320
Print ISSN : 1345-9678
ISSN-L : 1345-9678
Effect of Sodium Hypophosphite on the Structure and Properties of Electrodeposited Ni-W-P Alloys
Jamil AhmadKatsuhiko AsamiAkira TakeuchiAkihisa Inoue
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2003 Volume 44 Issue 4 Pages 705-708


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.

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© 2003 The Japan Institute of Metals and Materials
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