Hot Corrosion of Preoxidized Ni by a Thin Fused Na2 SO 4 Film at 900°C
Abstract
The hot corrosion of preoxidized 99% and 99.99% pure Ni covered with a thin Na 2 SO 4 film in a SO 2 ‐ O 2 gas atmosphere was investigated at 900°C by an electrochemical method using a sodium sensor and an oxygen probe. The preoxidation conditions were varied in order to affect the sulfidation of Ni, which resulted in an increase in salt basicity and thereafter catastrophic corrosion. The basicity gradient generated across the thin salt film supported a self‐sustaining basic fluxing and reprecipitation of the protective NiO scale.
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The addition of Na2O in the Na2SO4 salt immediately accelerates the corrosion rate due to the elevated melt basicity.
“Otsuka et al. found the addition of Na2O in the Na2SO4 salt immediately accelerates the corrosion rate due to the elevated melt basicity [85].”
From A review on molten sulfate salts induced hot corrosion (2021) · cites this paper as [85]
Otsuka and Rapp tracked the melt basicity and oxygen activity at the oxide/salt interface on a preoxidized Ni sample using a sodium sensor and an oxygen sensor, and their results are illustrated in the diagram for Ni in the Na2SO4 melt.
“To further verify the accuracy of this model in the O2-SO2-SO3 environment, Otsuka and Rapp tracked the melt basicity and oxygen activity at the oxide/salt interface on a preoxidized Ni sample by attaching a sodium sensor and an oxygen sensor. The results are illustrated in the diagram for Ni in the Na2SO4 melt (Fig. 6) [85].”
From A review on molten sulfate salts induced hot corrosion (2021) · cites this paper as [85]
In the O2-SO2-SO3 environment, initial measurements of -log(aNa2O) and PO2 are located to the right of the NiO solubility minimum line because of the presence of SO3, and acidic fluxing occurs first.
“In the O2-SO2-SO3 environment, the initial measurements of -log(aNa2O) and PO2 are located to the right of the dashed line because of the presence of SO3, and acidic fluxing occurs at first.”
From A review on molten sulfate salts induced hot corrosion (2021) · cites this paper as [85]
Cited by
Sorted by citations
Hot Corrosion of Metals and Alloys
Pettit, F. (2011) · Oxidation of Metals · doi:10.1007/s11085-011-9254-6 · Cited by 241 · see citing works
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
Kung, S. C. (2015) · Corrosion · doi:10.5006/1409 · Cited by 13 · see citing works
- Authors
- Otsuka, N., & Rapp, R. A.
- Affiliations
- Department of Materials Science and Engineering, The Ohio State University, Columbus, Ohio 43210
- The Ohio State University (US)
- Venue
- Journal of The Electrochemical Society
- Publisher
- The Electrochemical Society
- Published
- 1990-01-01
- Volume
- 137
- Issue
- 1
- Pages
- 46-52
- ISSN
- 0013-4651 (ISSN-L)
- 1945-7111
- OpenAlex
- W2241205456
- Cited by
- 60
- References
- 0
- Citations by year
- 2025: 2 · 2024: 3 · 2023: 4 · 2022: 1 · 2021: 5 · 2020: 1 · 2019: 1 · 2018: 1 · 2017: 1 · 2016: 6 · 2015: 6 · 2014: 1 · 2013: 1 · 2012: 2
- FWCI
- 2.91
- Type
- journal article
- Language
- en
- Open access
- closed
- Licence
- Locations
- Journal of The Electrochemical Society (publishedVersion)
- Funders
- National Science Foundation
- Ohio State University
- Division of Materials Research
- Topics
- Physical Sciences › Engineering › Aerospace Engineering › High-Temperature Coating Behaviors
- Physical Sciences › Materials Science › Materials Chemistry › Corrosion Behavior and Inhibition
- Physical Sciences › Materials Science › Materials Chemistry › Advancements in Solid Oxide Fuel Cells
- Keywords
- hot corrosion, nickel, pre-oxidation, sulfidation, protective scale, oxygen sensors, electrochemical corrosion
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