Solubilities of α ‐ Fe2 O 3 and Fe3 O 4 in Fused Na2 SO 4 at 1200 K
Abstract
The solubility of mixed α ‐ Fe 2 O 3 and Fe 3 O 4 in fused Na 2 SO 4 was measured at 1200 K as a function of the melt basicity at 2.14 × 10 − 7 atm O 2 . At lower P O 2 , in separate ranges of basicity where either Fe 3 O 4 or else FeS is the stable phase, the solubilities of these compounds in Na 2 SO 4 were determined. From these solubility measurements, the activity coefficients of NaFeO 2 , FeS , and FeSO 4 in fused Na 2 SO 4 were calculated to be 430, 180, and 0.83, respectively. On this basis, the solubilities of the iron oxides α ‐ Fe 2 O 3 and Fe 3 O 4 and the dominant acidic and basic solutes were calculated for the entire regimes of P O 2 and melt basicity in which these phases are stable in Na 2 SO 4 .
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The solubilities and dissolution mechanisms of metal oxides in molten Na2SO4 depend on the value of -log(aNa2O).
“As discussed below, the solubilities and dissolution mechanisms of metal oxides in molten Na2SO4 are dependent on the value of -log(aNa2O).”
From A review on molten sulfate salts induced hot corrosion (2021) · cites this paper as [68]
Dissolution of metal oxides in molten Na2SO4 is divided into basic dissolution at log(aNa2O) values above the solubility minimum and acid dissolution at values below the solubility minimum.
“The dissolution is divided into two categories based on the melt basicity. Basic dissolution (Eq. (5, 7-10)) occurs at log(aNa2O) values above the basicity value for the solubility minimum of the metal oxide and acid dissolution Eq. (6, 11-14)) refers to the solubility reaction at basicity values below the solubility minimum [67-69].”
From A review on molten sulfate salts induced hot corrosion (2021) · cites this paper as [68]
For metal oxides with multiple valences available for the metal (e.g., cobalt, chromium and iron oxides), solubilities depend on the metal oxidation states, which in turn depend on the oxygen partial pressure.
“For metal oxides with multiple valences available for the metal (e.g., cobalt, chromium and iron oxides), solubilities depend on the metal oxidation states, which in turn is dependent on the oxygen partial pressure [68, 69, 74, 75].”
From A review on molten sulfate salts induced hot corrosion (2021) · cites this paper as [68]
Once the protective oxide layer contacts the fused salt, dissolution of various oxides such as NiO, Co3O4, Fe2O3, Fe3O4 and Cr2O3 takes place.
“Once the protective oxide layer comes into contact with the fused salt, the dissolution of various oxides, e.g., NiO, Co3O4, Fe2O3, Fe3O4 and Cr2O3, takes place.”
From A review on molten sulfate salts induced hot corrosion (2021) · cites this paper as [68]
The dissolution of metal oxides in molten Na2SO4 is closely related to melt basicity.
“The reaction involving the dissolution of metal oxides is closed related to the melt basicity.”
From A review on molten sulfate salts induced hot corrosion (2021) · cites this paper as [68]
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A review on molten sulfate salts induced hot corrosion
Hu, S., Finklea, H., & Liu, X. (2021) · Journal of Materials Science & Technology · doi:10.1016/j.jmst.2021.03.013 · Cited by 183 · see citing works
Chemistry and electrochemistry of hot corrosion of metals
Rapp, R. A. (1987) · Materials Science and Engineering · doi:10.1016/0025-5416(87)90394-6 · Cited by 155 · see citing works
Self-citation
- Authors
- Zhang, Y. S., & Rapp, R. A.
- Affiliations
- The Ohio State University (US)
- ORCID
- Zhang, Y. S.
- Venue
- Journal of The Electrochemical Society
- Publisher
- The Electrochemical Society
- Published
- 1985-10-01
- Volume
- 132
- Issue
- 10
- Pages
- 2498-2501
- ISSN
- 0013-4651 (ISSN-L)
- 1945-7111
- OpenAlex
- W2261597195
- Cited by
- 30
- References
- 0
- Citations by year
- 2023: 2 · 2022: 3 · 2021: 2 · 2020: 1 · 2019: 1 · 2016: 1 · 2015: 4
- FWCI
- 2.80
- Type
- journal article
- Language
- en
- Open access
- closed
- Licence
- Locations
- Journal of The Electrochemical Society (publishedVersion)
- Topics
- Physical Sciences › Engineering › Mechanical Engineering › Metallurgical Processes and Thermodynamics
- Physical Sciences › Chemical Engineering › Fluid Flow and Transfer Processes › Molten salt chemistry and electrochemical processes
- Physical Sciences › Materials Science › Ceramics and Composites › Glass properties and applications
- Keywords
- iron oxide solubility, hematite, magnetite, molten salts, oxygen partial pressure, activity coefficients, sodium ferrite, FeS, ferrous sulfate
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