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Open Chemistry

formerly Central European Journal of Chemistry

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Volume 9, Issue 1

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Volume 16 (2018)

Volume 15 (2017)

Volume 14 (2016)

Volume 13 (2015)

Volume 12 (2014)

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Volume 9 (2011)

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Volume 1 (2003)

Nature of the silver precipitation obtained by cementation from thiosulphate solutions

O. Kuntyi / G. Zozulya / I. Saldan / V. Kree / S. Korniy / B. Stel’makhovych
Published Online: 2010-12-16 | DOI: https://doi.org/10.2478/s11532-010-0139-3

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Abstract

The morphology and composition of the deposits formed on the surface of magnesium disk during cementation from thiosulphate solutions (0.0025–0.1M) [Ag(S2O3)2]3− + 0.5M S2O3 2− have been studied. A porous deposit with low adhesion is formed on the surface of the magnesium metal substrate. Within a wide range of [Ag(S2O3)2]3− ion concentrations, sulfur as well as silver are constituents of the deposit at the initial stages of cementation and at the end of the reaction. This is attributed to the electrochemical behaviour of magnesium in thiosulphate solutions resulting in the exceeding of current limit on cathode for pure silver reduction. Hence, parallel electrochemical reactions take place that are very close in their values to the standard redox potentials of reduction of [Ag(S2O3)2]3− ions to Ag0 and S2O32− ions to S2−. Sulfur content in the cement deposits increases with the decrease in [Ag(S2O3)2]3− ion concentration and increase in cementation time. This tendency is also observed with the decreasing solution temperature.

Keywords: Cementation; Silver; Magnesium disk; Thiosulphate; SEM images

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About the article

Published Online: 2010-12-16

Published in Print: 2011-02-01

Citation Information: Open Chemistry, Volume 9, Issue 1, Pages 180–184, ISSN (Online) 2391-5420, DOI: https://doi.org/10.2478/s11532-010-0139-3.

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© 2011 Versita Warsaw. This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License. BY-NC-ND 3.0

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