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Wear and Corrosion Behavior of CoNiCrAlY Bond Coats

Rathod, W. S. / Khanna, A. S. / Rathod, R. C. / Sapate, S. G.

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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Wear and Corrosion Behavior of CoNiCrAlY Bond Coats

Rathod, W. S. / Khanna, A. S. / Rathod, R. C. / Sapate, S. G.

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.

Wear and Corrosion Behavior of CoNiCrAlY Bond Coats

Rathod, W. S. / Khanna, A. S. / Rathod, R. C. / Sapate, S. G.

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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Title:

Wear and Corrosion Behavior of CoNiCrAlY Bond Coats

Contributors:

Rathod, W. S. (author) / Khanna, A. S. (author) / Rathod, R. C. (author) / Sapate, S. G. (author)

Published in:

Journal of The Institution of Engineers (India): Series C ; 95 ; 261-271

Publication date:

2014-07-01

Size:

11 pages

ISSN:

2250-0553 , 2250-0545

DOI:

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

Type of media:

Article (Journal)

Type of material:

Electronic Resource

Language:

English

Keywords:

Cold gas dynamic spray (CGDS) , High velocity oxygen-fuel (HVOF) , Bond coat , Porosity Engineering , Aerospace Technology and Astronautics , Mechanical Engineering , Industrial and Production Engineering

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