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Journal
2011 | 9 | 1 | 180-184
Article title

Nature of the silver precipitation obtained by cementation from thiosulphate solutions

Content
Title variants
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.
Publisher

Journal
Year
Volume
9
Issue
1
Pages
180-184
Physical description
Dates
published
1 - 2 - 2011
online
16 - 12 - 2010
Contributors
author
  • Institute of Chemistry, Lviv Polytechnic National University, Lviv, 79013, Ukraine
author
  • Institute of Chemistry, Lviv Polytechnic National University, Lviv, 79013, Ukraine
author
  • Centre for Materials and Coastal Research, Institute of Materials Research, Geesthacht, 21502, Germany
author
  • Centre for Materials and Coastal Research, Institute of Materials Research, Geesthacht, 21502, Germany
author
  • Karpenko Physical-Mechanical Institute of the NAS of Ukraine, Lviv, 79601, Ukraine
  • Chemistry Faculty, Ivan Franko National University of Lviv, Lviv, 79005, Ukraine
References
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Document Type
Publication order reference
Identifiers
YADDA identifier
bwmeta1.element.-psjd-doi-10_2478_s11532-010-0139-3
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