Iron carburization in a calcium carbide molten salt solution

Bonomi, Antonio; Parodi, M. T.; Gentaz, C.

doi:10.1007/bf01058871

Cited by 8 publications

(4 citation statements)

References 6 publications

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“…As molten salt electrolytes containing CaC2 are known to be partial electronic conductors (3,8), the expression for the cell voltage should include a correction term involving the electron transport number (18). This partial electronic conductivity could be in addition to a simple dissolution process at the origin of the gradual depletion of Ca from the Ca-Li electrode observed in this work.…”

Section: Discussionmentioning

confidence: 99%

“…In the case of solutions prepared with the technical grade CaC2, the voltametric curves show only one wave corresponding to the oxidation of carbide ion (7). Furthermore the decarburization of carbon-rich austenite samples has been reported when a low carbon steel crucible was used as electrolyte container (3) but only the carburization reaction has been observed in technical grade CaC2 solutions even in presence of low carbon steel crucibles (7,8). This different behavior may be explained by assuming that the synthetic CaC2 has a higher calcium content than the technical material and this difference in Ca content is conserved in the molten solution because equilibrium [1] i~ characterized by a very slow kinetic in one or both directions.…”

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confidence: 99%

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Galvanic Cell Studies on Ionic Carbide and Nitride Solutions in Molten Salts

Bonomi

Hadate

Gentaz

1977

J. Electrochem. Soc.

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The free energy (Gibbs) of formation of Li2C2 , CaC2 , and Li3N and their activities in molten salt solutions at temperatures between 823° and 973°K have been determined by using the following galvanic cellsnormalFe,normalLi‐normalCa )(normalalloy|normalLiCl‐CaCl2 normaleut.CaC2|C)(normals,normalFe ][IandnormalFe,normalLi )(normalc|normalLiCl‐normalLiF eut.Li3N|N2 )(normalg,1 normalatm,normalFe ][IIThe nitrogen electrode used in cell (II) has been proved to have a Nernstian behavior by studying the dependence of emf on the partial pressure of nitrogen. The activity coefficients of CaC2 and Li3N in molten salts have been found to decrease with increasing concentration.

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Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 99%

Galvanic Cell Studies on Ionic Carbide and Nitride Solutions in Molten Salts

Bonomi

Hadate

Gentaz

1977

J. Electrochem. Soc.

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“…Iron carburization in a calcium carbide molten salt was studied by Bonomi and co-workers. 10 Ito et al 11 deposited carbon films on conductive substrates by the oxidation of C 2− 2 ions in molten salt, and also synthesized carbon nitride by anode-discharge electrolysis. Meanwhile, the electro-reduction process has also attracted much attention for the preparation of carbon powder and film, which were prepared by electrochemical reduction of CO 2− 3 ions on the cathode in molten salt.…”

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confidence: 99%

Electrochemical Preparation of a Carbon/Cr-O-C Bilayer Film on Stainless Steel in Molten LiCl-KCl-K₂CO₃

Song

Shang

et al. 2014

J. Electrochem. Soc.

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A carbon film was electrochemically deposited on 304 stainless steel by reduction of carbonate ions in molten LiCl-KCl-K2CO3. A Cr-O-C interlayer was prepared by a joint process of thermal exposure of the steel in air and subsequent electrochemical reactions in molten salt for the enhancement of adhesion between the carbon film and the substrate. The bilayer film was delaminated gradually using electrochemical polarization in an aqueous NaCl solution, and was characterized by XRD, SEM, and XPS. Chromium element aggregates in the oxide scale from the 304 stainless steel substrate during the oxidation process, and transforms to chromium oxycarbide during electro-deoxidation of the oxide scale and diffusion of carbon nucleated from electro-reduction of carbonate ions. The interlayer mainly presents the CrO1.13C0.12 phase, which contains Cr-C and Cr-O bonds confirmed by XPS analysis. The presence of the CrO1.13C0.12 interlayer is an important factor for a continuous and adhesive carbon film on 304 stainless steel.

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“…To this latter case belongs the technique of metalliding [7] which involves simultaneous electrodeposition and solid state intermetallic diffusion in molten salt systems at elevated temperatures [8][9][10][11][12][13][14], The subject has recently been reviewed by R. S. Sethi [15]. For reversible electrochemical reactions the activity of the electroactive material is obtained by e.m.f.…”

Section: Introductionmentioning

confidence: 99%

Chronoamperometric Determination of Solid State Diffusion Coefficients in Copper-Gold Alloys Using a Molten Salt Electrolyte

Lantelme

Chemla

1983

Zeitschrift Für Naturforschung A

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The intermetallic diffusion coefficient in Cu-Au alloy between 400 °C and 550 °C is measured by chronoamperometry using a Cu-Au electrode in a molten LiCl-KCl electrolyte containing small amounts of Cu+ ions. The current response to a defined constant potential step is controlled by the rate of diffusion in the alloy electrode. The mathematical treatment developed by introducing the Boltzman transformation shows that the current density is a linear function of the reciprocal square root of time whatever the dependence of D versus concentration is. The method is applied to cathodic as well as anodic potential pulses which correspond to surface alloying or dissolution i.e. diffusion "in" or "out" the sample. The shift of the interface due to the copper deposition or dissolution is considered according to the Oldham and Raleigh's method. By studying the electrochemical response at very short times the diffusion can be examined in the first atomic layers of the electrode interface.

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Iron carburization in a calcium carbide molten salt solution

Cited by 8 publications

References 6 publications

Galvanic Cell Studies on Ionic Carbide and Nitride Solutions in Molten Salts

Galvanic Cell Studies on Ionic Carbide and Nitride Solutions in Molten Salts

Electrochemical Preparation of a Carbon/Cr-O-C Bilayer Film on Stainless Steel in Molten LiCl-KCl-K₂CO₃

Chronoamperometric Determination of Solid State Diffusion Coefficients in Copper-Gold Alloys Using a Molten Salt Electrolyte

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Iron carburization in a calcium carbide molten salt solution

Cited by 8 publications

References 6 publications

Galvanic Cell Studies on Ionic Carbide and Nitride Solutions in Molten Salts

Galvanic Cell Studies on Ionic Carbide and Nitride Solutions in Molten Salts

Electrochemical Preparation of a Carbon/Cr-O-C Bilayer Film on Stainless Steel in Molten LiCl-KCl-K2CO3

Chronoamperometric Determination of Solid State Diffusion Coefficients in Copper-Gold Alloys Using a Molten Salt Electrolyte

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Electrochemical Preparation of a Carbon/Cr-O-C Bilayer Film on Stainless Steel in Molten LiCl-KCl-K₂CO₃