Nickel electrodeposition from novel citrate bath

被引:45
作者
Chao-qun, Li [1 ]
Xin-hai, Li [1 ]
Zhi-xin, Wang [1 ]
Hua-Jun, Guo [1 ]
机构
[1] Cent S Univ, Sch Met Sci & Engn, Changsha 410083, Peoples R China
关键词
citrate bath; nickel electrodeposition; throwing index; buffering capacity; cathodic current efficiency;
D O I
10.1016/S1003-6326(07)60266-0
中图分类号
TF [冶金工业];
学科分类号
0806 ;
摘要
A new type of electroplating bath suitable for nickel electrodeposition was developed. Trisodium citrate was used as a complexing agent and a buffer in the bath. The buffering capacity between trisodium citrate and boric acid were compared. The effects were investigated under different conditions of bath composition, current density, pH and temperature on the potentiodynamic cathodic polarization curves, cathodic current efficiency and throwing index, as well as the electrical conductivity of these baths. The optimum conditions for producing sound and satisfactory nickel deposits were: NiSO4 center dot 6H(2)O 350 g/L, NiCl2 center dot 6H(2)O 45 g/L and Na3C6H5O7 30 g/L at pH=4 and 55 degrees C. The surface morphology of the as-plated Ni deposit was examined by SEM. The results reveal that the nickel deposition obtained from the optimum conditions are composed of compact, non-porous fine grains covering the entire surface. X-ray analysis shows that nickel deposits obtained from the citrate bath have a fine crystal structure compared with deposits from the Watts bath.
引用
收藏
页码:1300 / 1306
页数:7
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