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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 15    No. 4    August 2005

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Electrocrystallization nucleation and growth of NiFe alloys on brass substrate
ZHANG Zhao(张 昭)

Department of Chemistry, Zhejiang University, Hangzhou 310027, China

Abstract: The electrocrystalliztion nucleation and growth process of Ni-Fe alloy was studied using cyclic voltammetry and chronoamperometry. The results show that, in the case of high deposition overpotential, the nucleation/growth process of Ni-Fe binary alloy is 3-D instantaneous, and the growth rate of the previously formed nuclei increases with overpotential. However, at low overpotential, no distinguished nucleation current can be observed. Meanwhile, the discrepancy between the experimental non-dimensional variables(I/Im)2 and those calculated from the theoretical model was elucidated in the light of the molecular orbital theorem.

 

Key words: nickel-iron electroplating; nucleation; growth; mechanism 

ISSN 1672-7029
CN 43-1423/U

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