Influence of Two Different Salt Mixture Combinations of Na{sub 2}SO{sub 4}-NaCl-NaVO{sub 3} on Hot Corrosion Behavior of Ni-Base Superalloy Nimonic263 at 800 °C
Journal Article
·
· Journal of Materials Engineering and Performance
- Indian Institute of Technology Madras, Department of Metallurgical and Materials Engineering (India)
- Defence Metallurgical Research Laboratory, Structural Failure Analysis Group (India)
Isothermal hot corrosion behavior of Nimonic263 alloy was studied under the influence of two different salt mixtures of 87.5 wt.% Na{sub 2}SO{sub 4} + 5 wt.% NaCl + 7.5 wt.% NaVO{sub 3} (3SM) and 74 wt.% Na{sub 2}SO{sub 4} + 21.7 wt.% NaCl + 4.3 wt.% NaVO{sub 3} (3SM-A) and also without salt mixtures up to 500 h at 800 °C. Corrosion kinetics showed that 3SM-A is more aggressive than 3SM. Multiple oxides, spinels, sulfides, vanadate compounds, and volatile compounds were observed during various hot corrosion reactions. The volatile compounds NaClO{sub 3} and CrMoO{sub 3}, and SO{sub 3} gas are attributed to the weight loss under both 3SMs. The Na{sub 2}SO{sub 4} of 3SM prevailed till 400 h, but that of 3SM-A disappeared within 5 h, as established conclusively by Raman spectra analysis. The sulfides plus internal oxide zone increased with the increased exposure duration as evident from the extensive EPMA analysis. Based on the critical analysis of corrosion kinetics and detailed microstructural characterization, fluxing and sulfidation followed by oxidation are identified as plausible hot corrosion mechanisms under both 3SMs. Besides, chlorination and high-temperature oxidation mechanisms occur under 3SM-A condition.
- OSTI ID:
- 22970943
- Journal Information:
- Journal of Materials Engineering and Performance, Journal Name: Journal of Materials Engineering and Performance Journal Issue: 2 Vol. 28; ISSN 1059-9495; ISSN JMEPEG
- Country of Publication:
- United States
- Language:
- English
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