Nature of the silver precipitation obtained by cementation from thiosulphate solutions

• Authors: O. Kuntyi , G. Zozulya , I. Saldan , V. Kree , S. Korniy , B. Stel’makhovych
• Languages of publication: EN

Abstracts

EN

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

EN

Cementation; Silver; Magnesium disk; Thiosulphate; SEM images

• Publisher: De Gruyter Open
• Journal: Open Chemistry
• Year: 2011
• Volume: 9
• Issue: 1
• Pages: 180-184

Dates

published

1 - 2 - 2011

online

16 - 12 - 2010

Contributors

author

O. Kuntyi

• Institute of Chemistry, Lviv Polytechnic National University, Lviv, 79013, Ukraine

author

G. Zozulya

• Institute of Chemistry, Lviv Polytechnic National University, Lviv, 79013, Ukraine

author

I. Saldan

• Centre for Materials and Coastal Research, Institute of Materials Research, Geesthacht, 21502, Germany

author

V. Kree

• Centre for Materials and Coastal Research, Institute of Materials Research, Geesthacht, 21502, Germany

author

S. Korniy

• Karpenko Physical-Mechanical Institute of the NAS of Ukraine, Lviv, 79601, Ukraine

author

B. Stel’makhovych

• Chemistry Faculty, Ivan Franko National University of Lviv, Lviv, 79005, Ukraine

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Identifiers

DOI

10.2478/s11532-010-0139-3