Journal of Materials Engineering and Performance

, Volume 15, Issue 1, pp 130–138 | Cite as

Performance of high-velocity oxyfuel-sprayed coatings on an Fe-based superalloy in Na2SO4-60%V2O5 environment at 900 °C part II: Hot corrosion behavior of the coatings

  • T. S. Sidhu
  • S. Prakash
  • R. D. Agrawal
Materials Characterization

Abstract

NiCrBSi, Cr3C2-NiCr, Ni-20Cr, and Stellite-6 coatings were deposited on an Fe-based superalloy by the high-velocity oxyfuel (HVOF) thermal spray process. The hot corrosion behavior of the coatings in an aggressive environment of Na2SO4-60%V2O5 at 900 °C under cyclic conditions was studied. The thermogravimetric technique was used to establish the kinetics of corrosion. X-ray diffraction, scanning electron microscopy/energy-dispersive x-ray and electron probe microanalysis techniques were used to analyze the corrosion products. Hot corrosion resistances of all the coatings were found to be better than the uncoated superalloy. The Ni-20Cr coating was found to be the most protective, followed by Cr3C2-NiCr coatings. The Ni-20Cr coating had reduced the mass gain by 90% of that gained by the uncoated superalloy. The hot corrosion resistance shown by the Cr3C2-NiCr coating was slightly better compared with the NiCrBSi coating; however, both of the coatings performed better than the Stellite-6 coating. The Stellite-6 coating was the least effective among the coatings studied, but it was still successful in decreasing the mass gain to about one fourth compared with the uncoated superalloy. The formation of oxides and spinels of nickel, chromium, or cobalt may be contributing to the development of hot corrosion resistance in the coatings. This article focuses on the hot corrosion behavior of HVOF coatings. The characterization of these coatings has been presented in part I included in this issue.

Keywords

high-velocity oxyfuel spray coatings hot corrosion protective coatings superalloy 

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References

  1. 1.
    P. Hancock, Vanadic and Chloride Attack of Superalloys, Mater. Sci. Technol., 1987, 3, p 536–544Google Scholar
  2. 2.
    N. Eliaz, G. Shemesh, and R.M. Latanision, Hot Corrosion in Gas Turbine Components, Eng. Failure Anal., 2002, 9, p 31–43CrossRefGoogle Scholar
  3. 3.
    N.S. Bornstein, M.A. Decrescente, and H.A. Roth, The Relationship Between Relative Oxide Ion Content of Na2SO4, the Presence of Liquid Metal Oxides and Sulfidation Attack, Metall. Trans., 1973, 4, p 1799–1810Google Scholar
  4. 4.
    G.H. Meier and F.S. Pettiit, “Corrosion of Superalloy,” Conference on High Temperature (London, U.K.), The Institute of Metals, February 1986Google Scholar
  5. 5.
    J.A. Goebel, F.S. Pettit, and G.W. Coward, Mechanisms for the Hot Corrosion of Nickel-Base Alloys, Met. Trans., 1973, 4, p 261–275Google Scholar
  6. 6.
    T.S. Sidhu, R.D. Agrawal, and S. Prakash, Hot Corrosion of Some Superalloys and Role of High-Velocity Oxy-Fuel Spray Coatings: A Review, Surf. Coat. Technol., 2005, 198, p 441–446CrossRefGoogle Scholar
  7. 7.
    P.S. Sidky and M.G. Hocking, Review of Inorganic Coatings and Coating Processes for Reducing Wear and Corrosion, Br. Corrosion J., 1999, 34 (3), p 171–183CrossRefGoogle Scholar
  8. 8.
    J.R. Nicholls and D.J Stephenson, High Temperature Coatings for Gas Turbines, Surf. Eng., 1991, 22, p 156–163Google Scholar
  9. 9.
    R. Mevrel, State of the Art on High-Temperature Corrosion-Resistant Coatings, Mater. Sci. Eng. A, 1989, 120, p 13–24CrossRefGoogle Scholar
  10. 10.
    Th.F. Weber, High-Velocity Oxy-Fuel Spraying, Mater. Sci. Forum, 1994, 163, p 573–578Google Scholar
  11. 11.
    G. Iron, U. Zanchuk, and C.C. Berndt, Comparison of MCrAlY Coatings Sprayed by HVOF and Low Pressure Processes, Thermal Spray Coatings: Research, Design and Aplications, C.C. Berndt and T.F. Bernecki, Ed., June 7–11, 1993 (Anaheim, CA), ASM International, 1993, p 191–197Google Scholar
  12. 12.
    I. Gurappa, Influence of Alloying Elements on Hot Corrosion of Superalloys and Coatings: Necessity of smart Coatings for Gas Turbine Engines, Mater. Sci. Technol., 2003, 19, p 178–183Google Scholar
  13. 13.
    M.G. Hocking, Coatings Resistant to Erosive/Corrosive and Severe Environments, Surf. Coat. Technol., 1993, 62, p 460–466CrossRefGoogle Scholar
  14. 14.
    I. Gurrappa, Identification of Hot Corrosion Resistant MCrAlY Based Bond Coatings for Gas Turbine Engine Applications, Surf. Coat. Technol., 2001, 139, p 272–283CrossRefGoogle Scholar
  15. 15.
    M. Rosso and A. Bennani, “Studies of New Applications of Ni-Based Powders for Hardfacing Processes,” Paper presented at PM World Congress Thermal Spraying/Spray Forming, Granada, Spain, October, 1998, p 524–530.Google Scholar
  16. 16.
    R. Knight and R.W. Smith, HVOF Sprayed 80/20 NiCr Coatings-Process Influence Trends, Thermal Spray: International Advances in Coatings Technology, C.C. Berndt, Ed., May 25–June 5, 1992 (Orlando, FL), ASM International, 1992, p 159Google Scholar
  17. 17.
    M.R. Dorfman and J.A. DeBarro, Thermal Spraying: Current Status and Future Trends, Akira Ohmori, Ed., May 22–26, 1995 (Kobe, Japan), High Temperature Society of Japan, 1995, p 567Google Scholar
  18. 18.
    M.D.F. Harvey, A.J. Sturgeon, F.J. Blunt, and S.B. Dunkerton, Thermal Spraying: Current Status and Future Trends, Akira Ohmori, Ed., May 22–26, 1995 (Kobe, Japan), High Temperature Society of Japan, 1995, p 531–535Google Scholar
  19. 19.
    B. Nordmand, H. Liao, O. Landemarre, C. Coddet, and J. Pagetti, Thermal Spray: Meeting the Challenges of the 21st Century, C. Coddet, Ed., May 25–29, 1998 Nice, France), ASM International, 1998, p 69Google Scholar
  20. 20.
    H. Edris, D.G. McCartney, and A.J. Sturgeon, Microstructural Characterization of High Velocity Oxy-Fuel Sprayed Coatings of Inconel 625, J. Mater. Sci., 1997, 32, p 863CrossRefGoogle Scholar
  21. 21.
    F. Otsubo, H. Era, and K. Kishitake, Structure and Phases in Nickel-Base Self-Fluxing Alloy Coating Containing High Chromium and Boron, J. Thermal Spray Technol., 2000, 91, p 107–113CrossRefGoogle Scholar
  22. 22.
    S. Lebaili, S. Hamar, and S. Thibault, Equilibres Liquide-Solide Dans Le Systemr Ni-B-Si Dans la Region Riche en Nickle, Acta Metall., 1987, 35 (3), p 701–710, in FrenchCrossRefGoogle Scholar
  23. 23.
    Y. Kawahara, Development and Application of High Temperature Corrosion-Resistant Materials and Coatings for Advanced Waste-to-Energy Plants, Mater. High Temp., 1997, 14 (3), p 261–268Google Scholar
  24. 24.
    E.J. Morgan-Warren, Thermal Spraying for Boiler Tube Protection, Weld. Met. Fabric. (Jan./Feb.), 1992, p 25–31Google Scholar
  25. 25.
    K.C. Antony, Wear-Resistant Cobalt-Base Alloys, J Met., 1983, 39, p 52Google Scholar
  26. 26.
    P. Crook, Properties and Selection: Non-Ferrous Alloys and Special-Purpose Materials, Vol 10, ASM Handbook, 2nd ed., ASM International, 1993, p 446Google Scholar
  27. 27.
    D. Zhang, S.J. Harris, and D.G. McCartney, International Thermal Spray Conference, E. Lugscheider and C.C. Berndt, Ed., March 4–6, 2002 Essen, Germany), DVS Deutscher Verband für Schweissen, 2002, p 500–505Google Scholar
  28. 28.
    S.N. Tiwari, “Investigations on Hot Corrosion of Some Fe-, Ni- and Co-Base Superalloy in Na2SO4-V2O5 Environment Under Cyclic Conditions,” Ph.D. dissertation, Indian Institute of Technology Roorkee, Utranchal, India, 1997Google Scholar
  29. 29.
    A. Ul-Hamid, Diverse Scaling Behavior of the Ni-20Cr Alloy, Mater. Chem. Phys., Vol 80, 2003, p 135–142CrossRefGoogle Scholar
  30. 30.
    B.S. Sidhu and S. Prakash, Evaluation of the Corrosion Behaviour of Plasma-Sprayed Ni3Al Coatings on Steel in Oxidation and Molten Salt Environments at 900 °C, Surf. Coat. Technol., 2003, 166, p 89–100CrossRefGoogle Scholar
  31. 31.
    H. Singh, D. Puri, and S. Prakash, Some Studies on Hot Corrosion Performance of Plasma Sprayed Coatings on a Fe-Based Superalloy, Surf. Coat. Technol., 2005, 192, p 27–38CrossRefGoogle Scholar
  32. 32.
    S.E. Sadique, A.H. Mollah, M.S. Islam, M.M. Ali, M.H.H. Megat, and S. Basri, High-Temperature Oxidation Behavior of Iron-Chromium-Aluminum Alloys, Oxid. Met., 2000, 54 (5–6), p 385–400CrossRefGoogle Scholar
  33. 33.
    Q.M. Wang, Y.N. Wu, P.L. Ke, H.T. Cao, J. Gong, C. Sun, and L.S. Wen, Hot Corrosion Behaviour of AIP NiCoCrAlY(siB) Coatings on Nickel Base Superalloys, Surf. Coat. Technol., 2004, 186 (3), p 389–397CrossRefGoogle Scholar
  34. 34.
    G.A. Kolta, I.F. Hewaidy, and N.S. Felix, Reactions Between Sodium Sulphate and Vanadium Pentoxide, Thermochim. Acta, 1972, 4, p 151–164Google Scholar
  35. 35.
    S.N. Tiwari and S. Prakash, “Studies on the Hot Corrosion Behaviour of Some Superalloys in Na2SO4-V2O5,” Paper presented at Symposium on Localised Corrosion and Environmental Cracking (SOLCEC) (Kalpakkam, India), 1997, C-33Google Scholar
  36. 36.
    M. Seiersten and P. Kofstad, The Effect of SO3 on Vanadate-Induced Hot Corrosion, High Temp. Technol., 1987, 3 (5), p 115–122Google Scholar
  37. 37.
    J. Swaminathan, S. Raghavan, and S.R. Lyer, Studies on the Hot Corrosion of Some Nickel-Base Superalloys by Vanadium Pentoxide, Trans. Indian Inst. Metals, 1993, 3, p 175–181Google Scholar
  38. 38.
    G.C. Fryburg, F.J. Kohl, and C.A. Stearns, Chemical Reactions Involved in the Initiation of Hot Corrosion of IN-738, J. Electrochem. Soc., 1984, 131 (12), p 2985–2996CrossRefGoogle Scholar
  39. 39.
    K. Sachs, Accelerated High Temperature Oxidation due to Vanadium Pentoxide, Metallurgia, April, 1958, p 167–173Google Scholar
  40. 40.
    P. Niranatlumpong, C.B. Ponton, and H.E. Evans, The Failure of Protective Oxides on Plasma-Sprayed NiCrAlY Overlay Coatings, Oxid. Met., 2000, 53 (3–4), p 241–258CrossRefGoogle Scholar
  41. 41.
    B.S. Sidhu, “Studies on the Role of Coatings in Improving Resistance to Hot Corrosion and Degradation,” Ph.D. dissertation, Indian Institute of Technology Roorkee, Utranchal, India, 2003Google Scholar
  42. 42.
    G.R. Heath, P. Heimgartner, G. Irons, R. Miller, and S. Gustafsson, An Assessment of Thermal Spray Coating Technologies for High Temperature Corrosion Protection, Mater. Sci. Forum, 1997, 251–254, p 809–816CrossRefGoogle Scholar
  43. 43.
    Y. Longa-Nava, Y.S. Yang, M. Takemoto, and R.A. Rapp, Hot Corrosion of Nickel-Chromium and Nickel-Chromium-Aluminum Thermal-Spray Coatings by Sodium Sulfate-Sodium Metavanadate Salt, Corrosion, 1996, 52 (9), p 680–689CrossRefGoogle Scholar
  44. 44.
    G. Calvarin, R. Molins, and A.M. Huntz, Oxidation Mechanism of Ni-20Cr Foils and Its Relation to the Oxide-Scale Mircrostructure, Oxid. Met., 2000, 53 (1–2), p 25–48CrossRefGoogle Scholar
  45. 45.
    S. Sundararajan, S. Kuroda, K. Nishida, T. Itagaki, and F. Abe, Behaviour of Mn and Si in the Spray Powders During Steam Oxidation of Ni-Cr Thermal Spray Coatings, ISIJ Int., 2004, 44, p 139–144Google Scholar
  46. 46.
    H. Singh, “Hot Corrosion Studies on Plasma Spray Coatings over Some Ni-and Fe-Based Superalloys,” Ph.D. dissertation, Indian Institute of Technology Roorkee, Utranchal, India, 2005Google Scholar
  47. 47.
    K.L. Luthra, Kinetics of the Low Temperature Hot Corrosion of Co-Cr-Al Alloys, J. Electrochem. Soc., 1985, 132 (6), p 1293–1298CrossRefGoogle Scholar

Copyright information

© ASM International 2006

Authors and Affiliations

  • T. S. Sidhu
    • 1
  • S. Prakash
    • 1
  • R. D. Agrawal
    • 1
  1. 1.Metallurgical & Materials Engineering DepartmentIndian Institute of Technology RoorkeeRoorkeeIndia

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