Formation mechanism and structure of nickel-molybdenum-boron chemical-catalytic coatings

被引:0
|
作者
V. M. Krutskikh
M. V. Ivanov
A. B. Drovosekov
E. N. Loubnin
B. F. Lyakhov
Yu. M. Polukarov
机构
[1] Russian Academy of Sciences,Frumkin Institute of Physical Chemistry and Electrochemistry
来源
Russian Journal of Electrochemistry | 2008年 / 44卷
关键词
chemical-catalytic reduction; nickel; molybdenum; boron; dimethylamine-borane;
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学科分类号
摘要
Effect of molybdate-ions on the kinetics of partial reactions of dimethylamine-borane oxidation and nickel-and molybdate-ions reduction in the process of their chemical-catalytic reduction during the Ni-Mo-B-coatings deposition is studied. Molybdenum is deposited as metal only in the codeposition with nickel, yielding amorphous alloys. Adding of low concentration of the molybdate-ions to the nickel-plating solution increases the hydrogen evolution and alloy deposition rates as a result of the accelerating of dimethylamine-borane heterogeneous hydrolysis. At high molybdate-ion concentrations in the solution, a denser film of the molybdate reduction intermediate products forms at the electrode surface; this decreases the system’s catalytic activity as regards the dimethylamine-borane heterogeneous hydrolysis and thus decreases the hydrogen and nickel ions reduction rates.
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页码:728 / 735
页数:7
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