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Wear and Corrosion Behavior of CoNiCrAlY Bond Coats

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Abstract

The present study focusses on the wear and microstructural properties of CoNiCrAlY coatings fabricated on AISI 316L stainless steel substrate by using the (HVOF) and (CGDS) methods. A triobiological test was performed on the samples in order to understand the wear behaviour of thermally sprayed coatings. The microstructures of as-sprayed and worn out coatings were investigated by scanning electron microscopy. Coating hardness measurements were performed with nanoindentation. HVOF coating revealed lower hardness value in comparison with CGDS. Studies depicted better wear resistance of the CGDS sprayed with He, when compared to CGDS N2 and HVOF processing. Potentiodynamic polarization curves and tafel extrapolation experiments were carried at 7.5 pH value using 3.5 % NaCl as an electrolyte. Electrochemical studies depicted better corrosion resistance of the He processed coating when compared to N2 and HVOF processing.

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Acknowledgments

The authors are thankful to ASB Industries, Ohio, USA, and Metallizing Equipment Pvt. Ltd. Jodhpur, India, for providing thermal spraying facility of bond coats on samples.

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Correspondence to W. S. Rathod.

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Rathod, W.S., Khanna, A.S., Rathod, R.C. et al. Wear and Corrosion Behavior of CoNiCrAlY Bond Coats. J. Inst. Eng. India Ser. C 95, 261–271 (2014). https://doi.org/10.1007/s40032-014-0122-4

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  • DOI: https://doi.org/10.1007/s40032-014-0122-4

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