Cite this article as: |
Kuzhipadath Jitheshand Moganraj Arivarasu, Comparative studies on the hot corrosion behavior of air plasma spray and high velocity oxygen fuel coated Co-based L605 superalloys in a gas turbine environment, Int. J. Miner. Metall. Mater., 27(2020), No. 5, pp. 649-659. https://doi.org/10.1007/s12613-019-1943-1 |
An improvement in the corrosion resistance of alloys at elevated temperature is a factor for their potential use in gas turbines. In this study, CoNiCrAlY has been coated on the L605 alloy using air plasma spray (APS) and high-velocity oxygen fuel (HVOF) coating techniques to enhance its corrosion resistance. Hot corrosion studies were conducted on uncoated and coated samples in a molten salt environment at 850°C under cyclic conditions. Thermogravimetric analysis was used to determine the corrosion kinetics. The samples were subjected to scanning electron microscopy, energy-dispersive spectroscopy, and X-ray diffraction for further investigation. In coated samples, the formation of Al2O3 and Cr2O3 in the coating acts as a diffusion barrier that could resists the inward movement of the corrosive species present in the molten salt. Coated samples showed very less spallation, lower weight gain, less porosity, and internal oxidation as compared to uncoated sample. HVOF-coated sample showed greater corrosion resistance and inferred that this is the best technique under these conditions.
[1] |
M. Gell, J.W. Wang, R. Kumar, J. Roth, C. Jiang, and E.H. Jordan, Higher temperature thermal barrier coatings with the combined use of yttrium aluminum garnet and the solution precursor plasma spray process, J. Therm. Spray Technol., 27(2018), No. 4, p. 543. doi: 10.1007/s11666-018-0701-7
|
[2] |
J. Stringer, High-temperature corrosion of superalloys, Mater. Sci. Technol., 3(1987), No. 7, p. 482. doi: 10.1080/02670836.1987.11782259
|
[3] |
N.R. Muktinutalapati, A. Natarajan, and M. Arivarasu, Hot corrosion of superalloys in boilers for ultra-supercritical power plants, [in] S. Cevik, eds., Superalloys for Industry Applications, IntechOpen, Croatia, 2018, p. 29.
|
[4] |
N. Jegadeeswaran, K. Udaya Bhat, and M.R. Ramesh, Improving hot corrosion resistance of cobalt based superalloy (Superco-605) using HVOF sprayed oxide alloy powder coating, Trans. Indian Inst. Met., 68(2015), No. Suppl. 2, p. s309. doi: https://doi.org/10.1007/s12666-015-0605-x
|
[5] |
N. Jegadeeswaran, M.R. Ramesh, S. Prakrathi, and K. Udaya Bhat, Hot corrosion behaviour of HVOF sprayed stellite-6 coatings on gas turbine alloys, Trans. Indian Inst. Met., 67(2014), No. 1, p. 87. doi: 10.1007/s12666-013-0317-z
|
[6] |
G.R. Heath, P. Heimgartner, G. Irons, R.D. Miller, and S. Gustafsson, An assessment of thermal spray coating technologies for high temperature corrosion protection, Mater. Sci. Forum, 251-254(1997), p. 809. doi: 10.4028/www.scientific.net/MSF.251-254.809
|
[7] |
M. Arivarasu, M. Venkatesh Kannan, K. Devendranath Ramkumar, and N. Arivazhagan, Hot-corrosion resistance of dissimilar AISI 4340 and AISI 304L weldments in the molten salt environment at 600°C, Corros. Eng. Sci. Technol., 52(2017), No. 2, p. 114. doi: 10.1080/1478422X.2016.1213061
|
[8] |
H. Singh, Gitanjaly, S. Singh, and S. Prakash, High temperature corrosion behaviour of some Fe-, Co- and Ni-base superalloys in the presence of Y2O3 as inhibitor, Appl. Surf. Sci., 255(2009), No. 15, p. 7062. doi: 10.1016/j.apsusc.2009.03.040
|
[9] |
J. Cizek and J. Matejicek, Medicine meets thermal spray technology: A review of patents, J. Therm. Spray Technol., 27(2018), No. 8, p. 1251. doi: 10.1007/s11666-018-0798-8
|
[10] |
T. Hussain, T. Dudziak, N.J. Simms, and J.R. Nicholls, Fireside corrosion behavior of HVOF and plasma-sprayed coatings in advanced coal/biomass co-fired power plants, J. Therm. Spray Technol., 22(2013), No. 5, p. 797. doi: 10.1007/s11666-013-9887-x
|
[11] |
N. Bala, H. Singh, S. Prakash, and J. Karthikeyan, Investigations on the behavior of HVOF and cold sprayed Ni–20Cr coating on T22 boiler steel in actual boiler environment, J. Therm. Spray Technol., 21(2012), No. 1, p. 144. doi: 10.1007/s11666-011-9698-x
|
[12] |
J.C. Tan, L. Looney, and M.S.J. Hashmi, Component repair using HVOF thermal spraying, J. Mater. Process. Technol., 92-93(1999), p. 203. doi: 10.1016/S0924-0136(99)00113-2
|
[13] |
L.M. Sun, Thermal spray coatings on orthopedic devices: When and how the FDA reviews your coatings, J. Therm. Spray Technol., 27(2018), No. 8, p. 1280. doi: 10.1007/s11666-018-0759-2
|
[14] |
A. Mangla, V. Chawla, and G. Singh, Comparative study of hot corrosion behavior of HVOF and plasma sprayed Ni20Cr coating on SA213(T22) boiler steel in Na2SO4−60%V2O5 environment, Int. J. Eng. Sci. Res. Technol., 6(2017), No. 10, p. 674. doi: 10.5281/zenodo.1037655
|
[15] |
H. Singh, B.S. Sidhu, D. Puri, and S. Prakash, Use of plasma spray technology for deposition of high temperature oxidation/ corrosion resistant coatings—A review, Mater. Corros., 58(2007), No. 2, p. 92. doi: 10.1002/maco.200603985
|
[16] |
V. Mannava, A.S. Rao, N. Paulose, M. Kamaraj, and R.S. Kottada, Hot corrosion studies on Ni-base superalloy at 650°C under marine-like environment conditions using three salt mixture (Na2SO4 + NaCl + NaVO3), Corros. Sci., 105(2016), p. 109. doi: 10.1016/j.corsci.2016.01.008
|
[17] |
N.S. Patel, V. Pavlík, and M. Boča, High-temperature corrosion behavior of superalloys in molten salts—A review, Crit. Rev. Solid State Mater. Sci., 42(2017), No. 1, p. 83. doi: 10.1080/10408436.2016.1243090
|
[18] |
K. Zhang, M.M. Liu, S.L. Liu, C. Sun, and F.H. Wang, Hot corrosion behaviour of a cobalt-base super-alloy K40S with and without NiCrAlYSi coating, Corros. Sci., 53(2011), No. 5, p. 1990. doi: 10.1016/j.corsci.2011.02.022
|
[19] |
J.B. Yan, Y.M. Gao, L. Liang, Z.Z. Ye, Y.F. Li, W. Chen, and J.J. Zhang, Effect of yttrium on the cyclic oxidation behaviour of HP40 heat-resistant steel at 1373 K, Corros. Sci., 53(2011), No. 1, p. 329. doi: 10.1016/j.corsci.2010.09.039
|
[20] |
P. Choquet and R. Mevrel, Microstructure of alumina scales formed on NiCoCrAl alloys with and without yttrium, Mater. Sci. Eng. A, 120-121(1989), Part 1, p. 153.
|