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	Effect of alpha -Al/sub 2/O/sub 3/ particles on the electrochemical codeposition of Co-Ni alloys from sulfamate electrolytes
	Gang Wu ; Ning Li ; Dian Long Wang ; De Rui Zhou ; Bo Qing Xu ; Mitsuo, K.
	2010-05-06 ; 2010-05-06
关键词	Experimental/ adsorption alumina charge exchange copper alloys electrochemical analysis electrochemical impedance spectroscopy electrodeposition electrokinetic effects metallic thin films nickel alloys reduction (chemical) solid electrolytes/ alpha Al/sub 2/O/sub 3/ particles electrochemical codeposition mechanism CoNi alloys sulfamate electrolytes zeta potential electrochemical methods steady state polarization electrochemical impedance spectroscopy nickel rich electrolytes Co-Ni ratio electrolytes reduction potential charge transfer resistance cobalt rich electrolytes capacitive loop inductive loop Co/sup 2+/ concentration adsorption CoNi Al/sub 2/O/sub 3// A8115L Deposition from liquid phases (melts and solutions) A8280F Electrochemical analytical methods A8245 Electrochemistry and electrophoresis A6855 Thin film growth, structure, and epitaxy A8230F Ion-molecule, ion-ion, and charge-transfer reactions A8265M Sorption and accommodation coefficients (surface chemistry) A6845D Adsorption and desorption kinetics evaporation and condensation/ CoNi/ads Co/ads Ni/ads CoNi/bin Co/bin Ni/bin Al2O3/sur Al2/sur Al/sur O3/sur O/sur Al2O3/bin Al2/bin Al/bin O3/bin O/bin
中文摘要	The effect of alpha -Al/sub 2/O/sub 3/ particles on the electrochemical codeposition behaviour of Co-Ni alloys from sulfamate electrolyte was investigated by codeposition experiments, zeta potential and electrochemical methods. The results indicate that the presence of Al/sub 2/O/sub 3/ particles in Co-Ni sulfamate electrolytes contributes to the preferential codeposition of Co. Moreover, increasing Co/sup 2+/ concentration also can enhance the codeposition of Al /sub 2/O/sub 3/ particles in Co-Ni alloy matrix. Zeta potential measurements confirm that Co/sup 2+/ has a stronger tendency to adsorb on Al/sub 2/O/sub 3/ particles surface than Ni/sup 2+/ does in sulfamate electrolytes. Steady-state polarization and electrochemical impedance spectroscopy (EIS) show that the effect of Al/sub 2/O/sub 3/ particles on electrochemical codeposition behaviour of Co-Ni alloy in different Co/sup 2+//Ni /sup 2+/ ratio electrolytes (1:5 and 5:1) is quite contrary. In nickel-rich electrolytes (Co/sup 2+//Ni/sup 2+/=1:5), the Al /sub 2/O/sub 3/ particles cause a negative shift in reduction potential and an increase of charge transfer resistance. However, in cobalt-rich electrolytes (Co/sup 2+//Ni/sup 2+/=5:1), Al/sub 2 /O/sub 3/ particles lead to a positive shift of reduction potential and reduce the charge transfer resistance. Moreover, in EIS, besides one capacitive loop at high frequency and one inductive loop at low frequency, the introduction of Al/sub 2/O/sub 3/ particles leads to a further inductive loop at low frequency. According to simulated results of EIS, an electrochemical codeposition mechanism of Al/sub 2/O/sub 3/ particles with Co-Ni alloys is presented and in good agreement with the experimental results.
语种	英语 ; 英语
出版者	Elsevier ; Netherlands
内容类型	期刊论文
源URL	[http://hdl.handle.net/123456789/12507]
专题	清华大学
推荐引用方式 GB/T 7714	Gang Wu,Ning Li,Dian Long Wang,et al. Effect of alpha -Al/sub 2/O/sub 3/ particles on the electrochemical codeposition of Co-Ni alloys from sulfamate electrolytes[J],2010, 2010.
APA	Gang Wu,Ning Li,Dian Long Wang,De Rui Zhou,Bo Qing Xu,&Mitsuo, K..(2010).Effect of alpha -Al/sub 2/O/sub 3/ particles on the electrochemical codeposition of Co-Ni alloys from sulfamate electrolytes..
MLA	Gang Wu,et al."Effect of alpha -Al/sub 2/O/sub 3/ particles on the electrochemical codeposition of Co-Ni alloys from sulfamate electrolytes".(2010).

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