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Hot corrosion performance of LVOF sprayed Al2O3–40% TiO2 coating on Superni 601 and Superco 605 superalloys at 800 and 900°C

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Abstract

Al2O3–40% TiO2 coating is deposited on Superni 601 and Superco 605 superalloys by low-velocity oxy-fuel (LVOF) process. LVOF sprayed coating is characterized for surface roughness, microhardness, scanning electron microscopy and X-ray diffraction analysis. Hot corrosion of the coated and uncoated superalloys have been evaluated in an aggressive environment of Na2SO4–82% Fe2(SO4)3 under cyclic conditions at temperatures of 800 and 900°C. The microhardness and surface roughness values of the as-sprayed coatings are found to be in the range of 742–946 Hv and 14.40–14.80 μm, respectively. Al2O3–40% TiO2 coating on both the superalloys has indicated protective behaviour during hot corrosion studies.

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Acknowledgements

We wish to thank the Mishra Dhatu Nigam Limited, Hyderabad, India, for supplying the superalloys; Metallizing Equipment Company Private Ltd. (MECPL), Jodhpur, India, for providing the facility of the LVOF coating.

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  1. Mechanical Engineering Department, Motilal Nehru National Institute of Technology Allahabad, Allahabad, 211004, India

    N K MISHRA & S B MISHRA

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  1. N K MISHRA
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  2. S B MISHRA
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Correspondence to S B MISHRA.

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MISHRA, N.K., MISHRA, S.B. Hot corrosion performance of LVOF sprayed Al2O3–40% TiO2 coating on Superni 601 and Superco 605 superalloys at 800 and 900°C. Bull Mater Sci 38, 1679–1685 (2015). https://doi.org/10.1007/s12034-015-0986-9

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  • DOI: https://doi.org/10.1007/s12034-015-0986-9

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