Electrodeposition of Zn-Ni Alloy Whisker

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  • Kamei Kazuhito
    Research & Development Center Sumitomo Metal Industries, Ltd.
  • Yumoto Hisami
    Department of Materials Science and Technology, Science University of Tokyo

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Other Title
  • Zn-Ni合金ウィスカーの電析
  • Zn Ni ゴウキン ウィスカー ノ デンセキ

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Description

The electrodeposition behavior of Zn-Ni alloy whiskers from a sulfate bath has been studied by means of SEM, TEM and X-ray diffractmetry. The whiskers grow preferably under the low current density (1∼5×102 A/m2) and the low nickel bath content (about 10%). The structure of the whiskers is the type of γ-brass of which lattice parameter is about 0.9 nm. Since the whisker contains no dislocation, its growth mechanism should be similar to the Vapor-Liquid-Solid (VLS) mechanism that is able to explain the whisker formation from the vapour phase. In the electrodeposition of Zn-Ni alloy whiskers, the zinc hydoxide layer formed during the electrodeposition may play the role of the liquid layer in the VLS mechanism. The supporting electrolyte (Na2SO4) inhibits the electrophoresis and increases the viscosity of the bath, and the increasing the concentration of it promotes the growth of the whiskers extremely.

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