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A comparative study of different techniques for measuring the rate of the copper(II)/zinc cementation reaction
Journal article   Peer reviewed

A comparative study of different techniques for measuring the rate of the copper(II)/zinc cementation reaction

J. Xiong and I.M. Ritchie
Hydrometallurgy, Vol.16(3), pp.301-314
1986
DOI: https://doi.org/10.1016/0304-386X(86)90005-8
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Abstract

The rate of the copper(II)/zinc cementation reaction was measured by five techniques: analysis of the reactant solution for copper(II) and zinc(II) content; intersection of the polarization curves for the reduction of copper(II) and the oxidation of zinc metal; the time taken to react for a thin electrodeposited film of zinc of known thickness; the Stern—Geary method for determining the polarization resistance; and the impedance spectroscopy method of determining the polarization resistance. It was shown that the rate of loss of copper(II) from solution did not match the rate of appearance of zinc(II) in solution.because some zinc was dissolving as a result of copper-catalyse proton reduction. Depending on the measurement technique used, rate constants could be obtained for either the copper(II) loss from, or the zinc(II) appearance in the reaction solution. The various rate constants agreed within the limits of experimental error except for that determined from impedance spectroscopy.

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