Effect of annealing duration on the structure and hardness of electrodeposited Ni-W alloys

Shinichiro Hayata, Satoshi Oue, Takehiro Takahashi, Hiroaki Nakanono

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Electrodeposition of Ni-W alloys was conducted from an unagitated sulfate solution containing citric acid at pH 5 and 60 °C under coulostatic (9.0×105) and galvanostatic (100-3000 A·m-2) conditions onto steel sheets with an initial Ni plating to investigate the effect of annealing duration on the structure and hardness of deposited Ni-W alloys. The crystallite size of Ni in deposits with several seconds annealing increased significantly compared to without annealing, and gradually increased with annealing duration. With increasing the holding time at 700 °C to 100 and 1000 s, the precipitates of Ni4W and NiW were increased and became coarse at upper layers of deposits. The hardness of all the deposits increased with annealing, and the degree of increase became significantly large with increasing W content in deposit by increasing current density. The hardness of deposit with W content 45 mass% was maximum at holding time of 10 s at 700 °C, and gradually decreased with increasing annealing duration. The hardness of deposits increased when the precipitates of Ni4W and NiW were uniformly distributed in a fine size, which showing the optimum precipitation state at holding time of 10 s at 700 °C.

Original languageEnglish
Pages (from-to)598-604
Number of pages7
JournalTetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan
Volume101
Issue number11
DOIs
Publication statusPublished - Jan 1 2015

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hardness
Deposits
Hardness
deposits
Annealing
annealing
Precipitates
precipitates
citric acid
Citric acid
Steel sheet
Crystallite size
plating
Plating
Electrodeposition
Citric Acid
electrodeposition
Sulfates
sulfates
Current density

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Metals and Alloys
  • Materials Chemistry

Cite this

Effect of annealing duration on the structure and hardness of electrodeposited Ni-W alloys. / Hayata, Shinichiro; Oue, Satoshi; Takahashi, Takehiro; Nakanono, Hiroaki.

In: Tetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan, Vol. 101, No. 11, 01.01.2015, p. 598-604.

Research output: Contribution to journalArticle

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