日本金属学会誌

J. Japan Inst. Metals, Vol. 57, No. 11 (1993),
pp. 1227-1234

Electrodeposition of Zn--Ni Alloy Whisker

Kazuhito Kamei1 and Hisami Yumoto2

1Research & Development Center Sumitomo Metal Industries, Ltd., Amagasaki
2Department of Materials Science and Technology, Science University of Tokyo, Noda

Abstract:

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.


(Received June 16, 1993)

Keywords:

whisker, electrodeposition, zinc--nickel alloy, scanning electron microscope, transmission electron microscope crystal growth


PDF(Free)PDF (Free)     Table of ContentsTable of Contents

Please do not copy without permission.