Design of Molten Salt Bath on the Basis of Acid-Base Cooperative Reaction Mechanism.Smooth Electrodeposition of Tungsten from KF-B2O3-WO3 Molten Salt

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  • KOYAMA Koichiro
    Department of Materials Science and Engineering, Faculty of Engineering, Himeji Institute of Technology
  • MORISHITA Masao
    Department of Materials Science and Engineering, Faculty of Engineering, Himeji Institute of Technology
  • UMEZU Takayuki
    Graduate Student, Present Address: KOBELCO Research Institute, Inc.

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タイトル別名
  • Design of Molten Salt Bath on the Basis of Acid-Base Cooperative Reaction Mechanism. Smooth Electrodeposition of Tungsten from KF-B<sub>2</sub>O<sub>3</sub>-WO<sub>3</sub> Molten Salt
  • Design of Molten Salt Bath on the Basis of Acid-Base Cooperative Reaction Mechanism Smooth Electrodeposition of Tungsten from KF B2O3 W03 Molten Salt

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<p>This investigation was carried out to find a molten salt which enables a smooth electrodeposition of tungsten. The KF-B2O3-WO3 molten salt was selected on the basis of the acid-base cooperative reaction theory. A composition of KF(67 mol %)-B2O3(26 mol %)-WO3(7 mol %) was selected as the preferred bath composition. Using a tungsten anode, smooth electrodeposits were obtained at 1123 K and at a current density ranging from 250 Am−2 to 550 Am−2 on nickel, copper, stainless steel, and mild steel substrates. When a graphite anode was used, smooth electrodeposits accompanied by dendrites were obtained. The Vickers microhardness number of the electrodeposit was 422 (load 0.49 N). The smooth electrodeposit had tendencies to form the 111 fiber texture or a mixed texture of the 111, 211 and 321 fiber textures.</p>

収録刊行物

  • Electrochemistry

    Electrochemistry 67 (6), 677-683, 1999-06-05

    公益社団法人　電気化学会

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