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Bobrinskaya, E. V.; Vvedenskii, A. V.

doi:10.1023/a:1011952428088

Cited by 3 publications

(6 citation statements)

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“…However, insofar as < , the D Ag, III values are slightly higher than those found in terms of simpler models I and II. The difference decreases with an increase in the silver content in the alloy, because it is accompanied by a decrease in the relative alloy surface enrichment in gold [10]. Calculations show that introducing Ag + ions in the solution provides the validity of condition (3) irrespective of the composition of the studied alloys and the overpotential.…”

Section: Resultsmentioning

confidence: 87%

“…(10) and (11) are listed in Table 3. The D Ag, III / V ratio reflecting the contribution from the shift of the interface boundary to the interdiffusivity at f r = 1 increases from 3 to 24 with an increase in from 65 to 95 at.…”

Section: Resultsmentioning

confidence: 99%

“…Raoult law (χ > 0), 2 while gold reveals a heightened surface activity (K > 1), which is supposedly related in [10] to its higher hydrophilicity compared to silver.…”

Section: Theoretical Analysismentioning

confidence: 99%

“…An equilibrium isotherm of the surface composition of an Ag-Au alloy placed in an aqueous solution of an inactive electrolyte has the form [10]:…”

Section: Theoretical Analysismentioning

confidence: 99%

“…Insofar as Au remains thermodynamically stable ( I Au = 0) at these conditions, and the Faraday currents of the side processes in thoroughly deaerated solutions are negligible, I = I Ag . Note that the Ag-Au system alloys belong to those few systems that show equilibrium isotherms of the solid-phase adsorption of the components at the boundary with an aqueous solution of surface-inactive F -and Cl anions [9,10]. At certain assumptions, N ion can be put in the same class of anions.…”

Section: Introductionmentioning

confidence: 99%

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Solid-Phase Diffusion at a Potentiostatic Dissolution of Silver Alloyed with Gold

et al. 2005

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In an acidic nitrate solution containing no less than 10 -4 mol/l Ag + , potentiostatic anodic dissolution of silver from its alloy with gold (up to 35 at. %) already in about 10 s is limited by the solid-phase mutual diffusion of the components. A number of diffusion-kinetic dissolution models taking into account contributions from the liquid-phase mass transfer, segregation in the surface layer, microroughness of the surface, shift of the alloy-solution interface, as well as the relaxation of nonequilibrium vacancies into a transient dissolution current are considered. The diffusivities and mutual diffusivities of the components, concentrations of nonequilibrium vacancies, and thickness of the diffusion zone estimated in terms of these models are compared. The effect of the overpotential and alloy composition is discussed. The main source of nonequilibrium monovacancies in the amount 14 orders as high as the equilibrium one is found to be the dissolution of silver. The efficiency of the sinks, among which the formation of bivacancies seemingly dominates, is not high, which predetermines the slowness of relaxation processes in the solid-phase diffusion zone. PROTECTION OF METALS Vol. 41 No. 4 2005 KOZADEROV et al .

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Section: Resultsmentioning

confidence: 87%

Section: Resultsmentioning

confidence: 99%

“…Raoult law (χ > 0), 2 while gold reveals a heightened surface activity (K > 1), which is supposedly related in [10] to its higher hydrophilicity compared to silver.…”

Section: Theoretical Analysismentioning

confidence: 99%

“…An equilibrium isotherm of the surface composition of an Ag-Au alloy placed in an aqueous solution of an inactive electrolyte has the form [10]:…”

Section: Theoretical Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Solid-Phase Diffusion at a Potentiostatic Dissolution of Silver Alloyed with Gold

et al. 2005

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10.1007/s11124-008-1002-1

2000

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Based on the model taking into account the appearance of a morphological instability and the evolution of a surface with time during the selective anodic dissolution of a homogeneous A-B alloy with the predominant content of the electrochemically negative metal A, equations for the critical potential E cr and overpotential η cr of the surface development are derived. Criteria of the nature of chemical hindrances of the selective dissolution in the over-critical range are formulated. The E cr and η cr values corresponding to the breakage of the morphological stability of the A-B alloy surface (with the atomic silver part X Ag = 0.65 to 0.95) in an acidic nitrate solution containing diverse amounts of silver ions ( 10 -4 to 10 -2 M) are experimentally found. The character of the effect of the atomic gold content in the alloy and the concentration of silver ions in the solution on η cr and E cr values of the alloys is determined. The nature of the kinetic limitations of the selective dissolution in the over-critical potential range is clarified. PACS numbers: 82.45.Q

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