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| KINETICS OF CEMENTATION OF Ag WITH Cu IN AMMONIACAL SOLUTION |
| KE Jiajun; YUE Liangdong (Institute of Chemical Metallurgy; Academia Sinica; Beijing) (Manuscript received 13 June; 1983) |
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Cite this article:
KE Jiajun; YUE Liangdong (Institute of Chemical Metallurgy; Academia Sinica; Beijing) (Manuscript received 13 June; 1983). KINETICS OF CEMENTATION OF Ag WITH Cu IN AMMONIACAL SOLUTION. Acta Metall Sin, 1984, 20(3): 197-203.
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Abstract A thermodynamic analysis of cementation of Ag with Cu in ammoniacal solution has been carried out. The calculated results indicated that this cementation reaction is possible thermodynamically. The rotating disc of Cu has been used to study the kinetics of Ag cementation on metallic Cu in ammoniacal solution. Two stages of reaction rate were found in this cementation process, i.e., an initial slow rate and a second enhanced rate. The deposit morphology influences the cementation rate significantly. The initial stage of reaction corresponds to deposition on a relatively smooth surface and the reaction kinetics is controlled by mass transfer. The increased rate of the second stage reaction is due to the development of a structured surface deposit which effectively increases the surface area available for the cementation reaction.
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Received: 18 March 1984
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