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Comparative Study of Corrosion Performance of HVOF-Sprayed Coatings Produced Using Conventional and Suspension WC-Co Feedstock

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journal contribution
posted on 19.08.2019, 09:24 by R Ahmed, G Vourlias, A Algoburi, C Vogiatzis, D Chaliampalias, S Skolianos, L-M Berger, S Paul, NH Faisal, F-L Toma, NM Al-Anazi, MFA Goosen
Corrosion properties of nanostructured coatings deposited by suspension high-velocity oxy-fuel (S-HVOF) via an aqueous suspension of milled WC-Co powder were compared with conventional HVOF-sprayed coatings. Microstructural evaluations of these coatings included x-ray diffraction and scanning electron microscopy equipped with an energy-dispersive x-ray spectroscopy. The corrosion performance of AISI440C stainless steel substrate and the coatings was evaluated in a 3.5 wt.% NaCl aqueous solution at ~ 25 °C. The electrochemical properties of the samples were assessed experimentally, employing potentiodynamic polarization and electrochemical impedance spectroscopy. The potentiodynamic polarization results indicated that coatings produced by S-HVOF technique show lower corrosion resistance compared with the coatings produced by HVOF-JK (HVOF Jet Kote) and HVOF-JP (HVOF JP5000) techniques. Results are discussed in terms of corrosion mechanism, Bode and Nyquist plots, as well as equivalent circuit models of the coating–substrate system.

Funding

Financial support of Saudi Aramco for the research project is gratefully acknowledged.

History

Citation

Journal of Thermal Spray Technology, 2018, 27 (8), pp. 1579-1593 (15)

Author affiliation

/Organisation/COLLEGE OF SCIENCE AND ENGINEERING/Department of Engineering

Version

VoR (Version of Record)

Published in

Journal of Thermal Spray Technology

Publisher

Springer Verlag (Germany), ASM International

issn

1059-9630

eissn

1544-1016

Copyright date

2018

Available date

19/08/2019

Publisher version

https://link.springer.com/article/10.1007/s11666-018-0775-2

Language

en