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Journal of Materials Engineering and Performance

, Volume 28, Issue 2, pp 1077–1093 | Cite as

Influence of Two Different Salt Mixture Combinations of Na2SO4-NaCl-NaVO3 on Hot Corrosion Behavior of Ni-Base Superalloy Nimonic263 at 800 °C

  • Venkateswararao MannavaEmail author
  • A. SambasivaRao
  • M. Kamaraj
  • Ravi Sankar Kottada
Article
  • 26 Downloads

Abstract

Isothermal hot corrosion behavior of Nimonic263 alloy was studied under the influence of two different salt mixtures of 87.5 wt.% Na2SO4 + 5 wt.% NaCl + 7.5 wt.% NaVO3 (3SM) and 74 wt.% Na2SO4 + 21.7 wt.% NaCl + 4.3 wt.% NaVO3 (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 NaClO3 and CrMoO3, and SO3 gas are attributed to the weight loss under both 3SMs. The Na2SO4 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.

Keywords

EPMA hot corrosion Ni-base superalloys oxidation Raman spectroscopy XRD 

Notes

Acknowledgments

Authors would like to thank Dr. M. Premkumar, Scientist-D, and Mr. Nikentan Vaidya, a Technical officer of DMRL, for their help in facilitating the EPMA facility and their valuable time to conduct EPMA characterization on hot corroded specimens.

Supplementary material

11665_2019_3866_MOESM1_ESM.docx (248 kb)
Supplementary material 1 (DOCX 248 kb)

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Copyright information

© ASM International 2019

Authors and Affiliations

  • Venkateswararao Mannava
    • 1
    Email author
  • A. SambasivaRao
    • 2
  • M. Kamaraj
    • 1
  • Ravi Sankar Kottada
    • 1
  1. 1.Department of Metallurgical and Materials EngineeringIndian Institute of Technology MadrasChennaiIndia
  2. 2.Structural Failure Analysis GroupDefence Metallurgical Research LaboratoryHyderabadIndia

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