Simulation of Copper Cementation (Metal Displacement Reactions)

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Abstract
The cementation of copper in alkaline zinc solution (300 g/liter , 60 g/liter Zn, and 0.2 g/liter Cu) was studied and a method based on mathematical simulation was used to identify the mechanisms governing the process. Results suggest that activation was the initial mechanism, since copper ions do not deposit easily on zinc. However, the mechanism changed to diffusion after a few minutes of cementation, when copper ion deposition was facilitated by the presence of metallic copper partly covering the zinc surface. The mathematical procedure as well as the results of simulation are presented. Experimental cementations were performed and the data coincided with the predictions obtained by simulation. The present simulation method can be applied also to cementation in acid media.

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