Abstract:

Nickle dendrites were prepared by using a self-developed jet electrodeposition device, and the effects of different experimental parameters on the growth and microstructure of the dendrites were observed. Moreover, the fractal dimension of the dendrites in the pictures was calculated by means of the box-counting dimension method. The results show that （1） nickel dendrites are easy to form at a high density current; （2） the dendrites obviously become sparse with a decreasing fraetal number when the content of Ni ions in the electrolyte increases; （3） the microstructure of the dendrites changes from a compact and tight one to a diffuse and loose one; （4） with the increase of electrolyte temperature, the dendrites become more compact; （5） the dendrites are of obvious fraetal structure ; and （6） the fraetal dimension of the dendrites increases with the increase of current density and with the decrease of nickel ion content ; however, with the increase in the electrolyte temperature, it first increases and then decreases.

Key words: jet electrodeposition, nickle, dendritic crystal, box-counting dimension, fractal, current density