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Effect and Role of NaCl in Na2SO4 Deposits on the 900°C Hot Corrosion of a 2nd-Generation Ni-based Superalloy

  • Environmental Degradation of High Temperature Structural Materials
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Abstract

Hot corrosion of Ni-based superalloys has been extensively studied due to its negative impact on aero-turbine engines. However, the complexity of hot corrosion makes it difficult to discern the degradation pathways of field-exposed parts. To that end, it is technically important to conduct more complex laboratory-scale testing to develop a better understanding of the degradation pathways that may affect a field-exposed part. Na2SO4 has been the principal deposit considered in past studies, but with little consideration given to another common environmental species, NaCl. This study aimed to better understand the role of NaCl in Na2SO4 deposits at 900°C on a 2nd-generation, Ni-based superalloy, PWA 1429. A NaCl-only deposit was also studied to isolate NaCl’s role in affecting degradation. It was found that additions of NaCl induced greater degradation when compared to a Na2SO4-only deposit. Short-term exposures were able to determine that NaCl forms volatile chlorides with nickel that subsequently oxidize to form a porous, non-protective product. In tandem, oxygen ingress causes subsurface aluminum oxidation, which inhibits the formation of a protective oxide on the alloy. The results indicate that NaCl plays a major role early in the degradation process which may be missed during post-analyses after long-term exposures.

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Acknowledgements

This research was supported by the Office of Naval Research through contract number N000142112596 managed by Dr. David Shifler. Student support was provided by the Center for Energy through the R.K. Mellon Foundation.

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Authors and Affiliations

  1. Department of Mechanical Engineering and Materials Science, Swanson School of Engineering, University of Pittsburgh, Pittsburgh, PA, 15213, USA

    Preston Nguyen, Douglas Konitzer & Brian Gleeson

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  1. Preston Nguyen
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  2. Douglas Konitzer
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Correspondence to Preston Nguyen.

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Nguyen, P., Konitzer, D. & Gleeson, B. Effect and Role of NaCl in Na2SO4 Deposits on the 900°C Hot Corrosion of a 2nd-Generation Ni-based Superalloy. JOM (2024). https://doi.org/10.1007/s11837-024-06509-2

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