Nature of the silver precipitation obtained by cementation from thiosulphate solutions

• Autorzy: O. Kuntyi , G. Zozulya , I. Saldan , V. Kree , S. Korniy , B. Stel’makhovych
• Języki publikacji: EN

Abstrakty

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.

Słowa kluczowe

EN

Cementation; Silver; Magnesium disk; Thiosulphate; SEM images

• Czasopismo: Open Chemistry
• Rocznik: 2011
• Tom: 9
• Numer: 1
• Strony: 180-184

Daty

wydano

2011-02-01

online

2010-12-16

Twórcy

autor

O. Kuntyi

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

autor

G. Zozulya

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

autor

I. Saldan

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

autor

V. Kree

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

autor

S. Korniy

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

autor

B. Stel’makhovych

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

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Identyfikatory

DOI

10.2478/s11532-010-0139-3