Characterization of slurry-based mullite coating deposited on P91 steel welds

  • Sonu Kanwal
  • J. G. ThakareEmail author
  • Chandan PandeyEmail author
  • Inderdeep Singh
  • M. M. Mahapatra


Ceramic coatings are widely used as thermal and environment barrier coatings due to their inert properties and capability to withstand high temperature. Ceramic coatings are commonly deposited by air plasma spray process and electron beam physical vapor deposition. In the present work, a cost-effective, slurry-based dip coating technique was developed to deposit mullite-based ceramic coating on the P91 steel substrate. The coating has been characterized by X-ray diffraction technique and scanning electron microscopy. Sintering of coatings was carried out in the temperature range of 900–1000 °C. Sintering time was varied between 0.5 and 1 h. Energy dispersive spectroscopy was carried out to study the distribution and diffusion of constituent elements during high-temperature sintering. Potentiodynamic polarization tests and thermo-gravimetric analysis were performed to investigate the corrosion behavior of the coating. The coating sintered at 1000 °C was found to be free from cracks and other microdefects. The corrosion rate of coating sintered at 1000 °C was found to be 26.06 mpy whereas the uncoated sample showed a higher corrosion rate of 153.7 mpy.


Ceramic Slurry coating HAZ Corrosion Porosity 


  1. 1.
    Padture, N.P.: Thermal barrier coatings for gas-turbine engine applications. Science. 296, 280–284 (2002). CrossRefGoogle Scholar
  2. 2.
    Thakare, J.G., Pandey, C., Mulik, R.S., Mahapatra, M.M.: Mechanical property evaluation of carbon nanotubes reinforced plasma sprayed YSZ-alumina composite coating. Ceram. Int. 44, (2018). CrossRefGoogle Scholar
  3. 3.
    Eliaz, N., Shemesh, G., Latanision, R.M.: Hot corrosion in gas turbine components. Eng. Fail. Anal. 9, 31–43 (2002). CrossRefGoogle Scholar
  4. 4.
    Pawlowski, L., Fauchais, P.: Thermal transport properties of thermally sprayed coatings. Int. Mater. Rev. 37, 271–289 (1992). CrossRefGoogle Scholar
  5. 5.
    Cojocaru, C.V.: Mechanical behaviour of air-plasma sprayed functionally graded YSZ-mullite environmental barrier coatings : a study .... NRC Publications Archive ( NPArC ), (2010)Google Scholar
  6. 6.
    Sidhu, T.S., Prakash, S., Agrawal, R.D.: Evaluation of hot corrosion resistance of HVOF coatings on a Ni-based superalloy in molten salt environment. Mater. Sci. Eng. A. 430, 64–78 (2006). CrossRefGoogle Scholar
  7. 7.
    Nguyen, P., Hardin, S, Ho, S., Y.: Experimental studies on slurry based thermal barrier coatings. In: 5th Australasian Cong. on App. Mech., ACAM 2007, Brisbane, Australia, 10–12 Dec 2007Google Scholar
  8. 8.
    Verma, R., Suri, N.M., Kant, S.: Parametric appraisal of slurry-sprayed mullite coatings for coating thickness. J. Therm. Spray Technol. 25, 1289–1301 (2016). CrossRefGoogle Scholar
  9. 9.
    Singh, M.N., Singh, I., Pandey, J.L.: High temperature corrosion-resistant coating on steel for short-term application. Anti-Corrosion Methods Materials. 44, 90–93 (1997). CrossRefGoogle Scholar
  10. 10.
    Davis, J.R.: Thermal spray technology. Technology. (2004)Google Scholar
  11. 11.
    Verma, R., Suri, N.M., Kant, S.: Effect of parameters on adhesion strength for slurry spray coating technique. Mater. Manuf. Process. 6914, (2016). CrossRefGoogle Scholar
  12. 12.
    Atik, M., Zarzycki, J.: Protective TiO2-SiO2 coatings on stainless steel sheets prepared by dip-coating. J. Mater. Sci. Lett. 13, 1301–1304 (1994). CrossRefGoogle Scholar
  13. 13.
    Chen, J., Craig, G., Farley, E., Sanjurjo, A.: Titanium-based coatings on steel: dip coating and plasma spray. Surf. Coat. Technol. 49, 116–120 (1991). CrossRefGoogle Scholar
  14. 14.
    Zhang, B., Huang, J., Ouyang, H., Cao, L., Li, C.: A mullite oxidation protective coating on SiC coated carbon/carbon composites by hot dipping. Ceram. Int. 42, 17932–17935 (2016). CrossRefGoogle Scholar
  15. 15.
    Kenhong, T., Lothongkum, G., Boonyongmaneerat, Y.: Influence of hot-dip coatings on mechanical and corrosion behaviors of steel bolts. 24, 49–53 (2014)Google Scholar
  16. 16.
    Naceur, H., Megriche, A., El Maaoui, M.: Effect of sintering temperature on microstructure and electrical properties of Sr1−x(Na0.5Bi0.5) x Bi2Nb2O9 solid solutions. Journal of Advanced Ceramics. 3, 17–30 (2014). CrossRefGoogle Scholar
  17. 17.
    García, D.E., Klein, A.N., Hotza, D.: Advanced ceramics with dense and fine-grained microstructures through fast firing. Rev. Adv. Mater. Sci. 30, 273–281 (2012)Google Scholar
  18. 18.
    Thakare, J.G., Mulik, R.S., Mahapatra, M.M.: Effect of carbon nanotubes and aluminum oxide on the properties of a plasma sprayed thermal barrier coating. Ceram. Int. 44, (2018). CrossRefGoogle Scholar

Copyright information

© Australian Ceramic Society 2018

Authors and Affiliations

  1. 1.Mechanical and Industrial Engineering DepartmentIndian Institute of Technology RoorkeeRoorkeIndia
  2. 2.Mechanical Department SRM-IST NCR CampusModinagarIndia
  3. 3.School of Mechanical SciencesIndian Institute of Technology BhubaneswarBhubaneswarIndia

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