Skip to main content
SpringerLink
Log in

Corrosion Behavior of Inconel 625 Alloy in Na2SO4–K2SO4 at High Temperature

  • Conference paper
  • First Online:
Book cover Physics and Engineering of Metallic Materials (CMC 2018)

Part of the book series: Springer Proceedings in Physics ((SPPHY,volume 217))

Included in the following conference series:

Abstract

The corrosion behavior of Inconel 625 alloy at 800 and 900 °C in the molten salt of 75 wt% Na2SO4–25 wt% K2SO4 was studied. The corrosion mechanism of Inconel 625 alloy after hot corrosion is mainly alkaline melting mechanism. The Cr2O3 on the surface of the alloy dissolved in molten salt as Na2CrO4, leading to the loss of the protective oxide layer on the alloy surface. With the decomposition of Cr2O3 on the surface of the alloy, Cr-depleted region appeared at the interface of the alloy matrix/corrosion layer, which inhibited the growth of the Cr2O3 oxide layer and resulted in the discontinuous oxide layer. This caused O and S to invade the substrate and corrode the alloy matrix. When the alloy was corroded at 800 °C for 120 h, the corrosion rate was about 3 mg/cm2. The corrosion layer was relatively complete, and it mainly consisted of flaky Cr2O3 and spinel-like NiCr2O4. When the alloy was corroded at 900 °C for 120 h, the corrosion rate was about 6 mg/cm2, and obvious shedding and faults appeared in the corrosion layer, which were mainly divided into three layers: the outer layer was composed of NiCr2O4 and NiO; the middle layer was a dense Cr2O3; the inner layer was composed of sulfides (Cr2S3 and Ni3S2), oxides (Cr2O3 and NiO), telluride, etc. Through thermodynamic calculation and analysis, it was found that SO2 decomposed from molten salt under high temperature could cause severe corrosion to the alloy. The main corrosion products were Cr2O3, Cr2S3, NiO, and Ni3S2.

This is a preview of subscription content, log in via an institution to check access.

Access this chapter

Log in via an institution
Chapter
USD 29.95
Price excludes VAT (USA)
  • Available as PDF
  • Read on any device
  • Instant download
  • Own it forever
eBook
USD 189.00
Price excludes VAT (USA)
  • Available as EPUB and PDF
  • Read on any device
  • Instant download
  • Own it forever
Hardcover Book
USD 249.99
Price excludes VAT (USA)
  • Durable hardcover edition
  • Dispatched in 3 to 5 business days
  • Free shipping worldwide - see info

Tax calculation will be finalised at checkout

Purchases are for personal use only

Institutional subscriptions

References

  1. G.P. Dinda, A.K. Dasgupta, J. Mazumder, Laser aided direct metal deposition of Inconel 625 superalloy: microstructural evolution and thermal stability. Mater. Sci. Eng. A 509, 98–104 (2009)

    Article  Google Scholar 

  2. E. Mohammadi Zahrani, A.M. Alfantazi, High temperature corrosion and electrochemical behavior of Inconel 625 weld overlay in PbSO4-Pb3O4-PbCl2-CdO-ZnO molten salt medium. Corros. Sci. 85, 60–76 (2014)

    Article  CAS  Google Scholar 

  3. S.J. Zinkle, G.S. Was, Materials challenges in nuclear energy. Acta Mater. 61(3), 735–758 (2013)

    Article  CAS  Google Scholar 

  4. P.S. Sidky, M.G. Hocking, The hot corrosion of Ni-based ternary alloys and superalloys for application in gas turbines employing residual fuels. Corros. Sci. 27(5), 499–530 (1987)

    Article  CAS  Google Scholar 

  5. D. Kim, H.J. Lee, C. Jang, D.J. Yoon, Corrosion characteristics of Ni-base superalloys in high temperature steam with and without hydrogen. J. Nucl. Mater. 441(1–3), 612–622 (2013)

    Article  CAS  Google Scholar 

  6. N. Eliaz, G. Shemesh, R.M. Latanision, Hot corrosion in gas turbine components. Eng. Fail. Anal. 9(1), 31–43 (2002)

    Article  CAS  Google Scholar 

  7. K. Misraa, Studies on the hot corrosion of a nickel-base superalloy, Udimet 700. Oxid. Met. 25(3–4), 129–161 (1986)

    Article  Google Scholar 

  8. W. Kai, C.H. Lee, T.W. Lee, C.H. Wu, Sulfidation behavior of Inconel 738 superalloy at 500–900 °C. Oxid. Met. 56(1/2), 51 (2001)

    Article  CAS  Google Scholar 

  9. R.D.K. Misra, R. Sivakumar, Effect of NaCl vapor on the oxidation of Ni-Cr alloy. Oxid. Met. 25(1/2), 83 (1986)

    Article  CAS  Google Scholar 

  10. S.R. Kameswa, The role of NaCl in the hot-corrosion behavior of nimonic alloy 90. Oxid. Met. (1/2), 33 (1986)

    Google Scholar 

  11. L. Jintao, Y. Zhen, L. Yan et al., Effect of alloying chemistry on fireside corrosion behavior of Ni–Fe-based superalloy for ultra-supercritical boiler applications. Oxid. Met. 12, 1–13 (2017)

    Google Scholar 

  12. H. Cui, J.S. Zhang, Y. Murata et al., Hot corrosion behavior of Ni-based superalloy with higher Cr contents-part II. Mechanism of hot corrosion behavior. J. Univ. Sci. Tech. Beijing 3, 91 (1996)

    CAS  Google Scholar 

  13. M. Li, High Temperature Corrosion of Metals (Metallurgical Industry Press, Beijing, 2001), p. 263. (in chinese)

    Google Scholar 

  14. J. Wang, C. Li, T. Zhang et al., Hot corrosion behavior of Ni-Cr-W based superalloy in molten salt environment. Aerosp. Mater. Technol. 44(6), 26–29 (2014). (in chinese)

    CAS  Google Scholar 

  15. J. Sun, The oxidation behavior of Ni-20Cr-Si and Ni-20Cr-Si-Al alloys at 1200 °C. J. Chin. Soc. Corros. Prot. (1), 53–58 (1993), (in chinese)

    Google Scholar 

  16. H. Chao, L. Yong, W. Yan et al., Hot corrosion behavior of Ni-xCr-6.8Al based alloys. Trans. Nonferrous Met. Soc. China 21(11), 2348–2357 (2011)

    Article  Google Scholar 

Download references

Acknowledgements

The financial support by the National Natural Science Fund (51661019), Gansu Province Major Science and Technology Special Project (145RTSA004), National Key Laboratory of Nickel and Cobalt Resource Comprehensive Utilization (301170503).

Author information

Authors and Affiliations

  1. State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, Lanzhou University of Technology, Lanzhou, 730050, China

    Yuan-Jun Ma, Yutian Ding, Jian-Jun Liu & Yu-Bi Gao

  2. State Key Laboratory of Nickel and Cobalt Resources Comprehensive Utilization, Jinchuan Group Co., Ltd., Jinchang, 737100, China

    Dong Zhang

Authors
  1. Yuan-Jun Ma
    View author publications

    You can also search for this author in PubMed Google Scholar

  2. Yutian Ding
    View author publications

    You can also search for this author in PubMed Google Scholar

  3. Jian-Jun Liu
    View author publications

    You can also search for this author in PubMed Google Scholar

  4. Yu-Bi Gao
    View author publications

    You can also search for this author in PubMed Google Scholar

  5. Dong Zhang
    View author publications

    You can also search for this author in PubMed Google Scholar

Corresponding author

Correspondence to Yutian Ding .

Editor information

Editors and Affiliations

  1. Chinese Materials Research Society, Beijing, China

    Yafang Han

Rights and permissions

Reprints and permissions

Copyright information

© 2019 Springer Nature Singapore Pte Ltd.

About this paper

Check for updates. Verify currency and authenticity via CrossMark

Cite this paper

Ma, YJ., Ding, Y., Liu, JJ., Gao, YB., Zhang, D. (2019). Corrosion Behavior of Inconel 625 Alloy in Na2SO4–K2SO4 at High Temperature. In: Han, Y. (eds) Physics and Engineering of Metallic Materials. CMC 2018. Springer Proceedings in Physics, vol 217. Springer, Singapore. https://doi.org/10.1007/978-981-13-5944-6_16

Download citation

  • DOI: https://doi.org/10.1007/978-981-13-5944-6_16

  • Published:

  • Publisher Name: Springer, Singapore

  • Print ISBN: 978-981-13-5943-9

  • Online ISBN: 978-981-13-5944-6

  • eBook Packages: Physics and AstronomyPhysics and Astronomy (R0)

Publish with us

Policies and ethics

Search

Navigation