Hot Corrosion of Nimonic 105 in Sodium Sulfate-Sodium Chloride Melts
Abstract
The corrosion behavior of Nimonic 105 in molten Na2SO4, NaCl, and mixtures of these two salts, at 900 C, in laboratory air and under O2 + SO2/SO3 atmospheres has been evaluated by potentiodynamic, potential decay, and free corrosion potential measurements. In addition, the corrosion products were examined using several electron-optical techniques, and by other analytical methods. Pure Na2SO4 in air did not seem to be very corrosive towards Nimonic 105. Addition of NaCl to the molten Na2SO4 resulted in increased dissolution of Nimonic 105, which was in general nonuniform, alloy constituents nickel and cobalt dissolving more than others. Evidence of internal attack and enhancement of dissolution of the Ni alloy by SO3 was significant only when the corrosion conditions were prolonged. In pure NaCl, catastrophic corrosion occurs, which has been attributed to the depletion, dissolution, and vaporization of some alloy species.
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Chloride ions are prone to destroy the protective layer of metal oxides, e.g., Cr2O3, Fe2O3 and Ni2O3, through Eq. (26-28).
“Chloride ions are prone to destroy the protective layer of metal oxides, e.g., Cr2O3, Fe2O3 and Ni2O3, through Eq. (26-28) [40, 98].”
From A review on molten sulfate salts induced hot corrosion (2021) · cites this paper as [98]
Cites
Mechanisms for the hot corrosion of nickel-base alloys
Goebel, J. A., Pettit, F. S., & Goward, G. W. (1973) · Metallurgical Transactions · doi:10.1007/bf02649626 · Cited by 420 · see citing works
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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
- Authors
- Sequeira, C. A. C., & Hocking, M. G.
- Affiliations
- University of Lisbon (PT)
- Imperial College London (GB)
- Venue
- Corrosion
- Published
- 1981-07-01
- Volume
- 37
- Issue
- 7
- Pages
- 392-407
- ISSN
- 0010-9312 (ISSN-L)
- 1938-159X
- OpenAlex
- W2143772801
- Cited by
- 14
- References
- 1
- Citations by year
- 2025: 1 · 2021: 2 · 2020: 1 · 2019: 1 · 2018: 2 · 2016: 1
- FWCI
- 1.86
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- CORROSION (publishedVersion)
- Topics
- Physical Sciences › Engineering › Aerospace Engineering › High-Temperature Coating Behaviors
- Physical Sciences › Chemical Engineering › Fluid Flow and Transfer Processes › Molten salt chemistry and electrochemical processes
- Physical Sciences › Materials Science › Materials Chemistry › Corrosion Behavior and Inhibition
- Keywords
- Nimonic 105, nickel-based superalloy, hot corrosion, molten salts, sodium sulfate, sodium chloride, alloy dissolution, corrosion products
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