Comparative study of corrosion performance of HVOF-sprayed coatings produced using conventional and suspension WC-Co feedstock.

Ahmed, Rehan; Vourlias, G.; Algoburi, A.; Vogiatzis, C.; Chaliampalias, D.; Skolianos, S.; Berger, Lutz-Michael; Paul, Shiladitya; Faisal, Nadimul Haque; Toma, Filofteia-Laura; Al-Anazi, Nayef M.; Goosen, Mattheus F.A.

Abstract

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.

Citation

AHMED.R., VOURLIAS, G., ALGOBURI, A., VOGIATZIS, C., CHALIAMPALIAS, D., SKOLIANOS, S., BERGER, L.-M., PAUL, S., FAISAL, N.H., TOMA, F.-L., AL-ANAZI, N.M and GOOSEN, M.F.A. 2018. Comparative study of corrosion performance of HVOF-sprayed coatings produced using conventional and suspension WC-Co feedstock. Journal of thermal spray technology [online], 27(8), pages 1579-1593. Available from: https://doi.org/10.1007/s11666-018-0775-2

• Journal Article Type: Article
• Acceptance Date: Sep 26, 2018
• Online Publication Date: Oct 30, 2018
• Publication Date: Dec 31, 2018
• Deposit Date: Nov 16, 2018
• Publicly Available Date: Nov 16, 2018
• Journal: Journal of thermal spray technology
• Print ISSN: 1059-9630
• Electronic ISSN: 1544-1016
• Publisher: Springer
• Peer Reviewed: Peer Reviewed
• Volume: 27
• Issue: 8
• Pages: 1579-1593
• DOI: https://doi.org/10.1007/s11666-018-0775-2
• Keywords: Corrosion; HVOF; Nanostructured coatings; S-HVOF; Suspension spraying; WC-Co feedstock
• Public URL: http://hdl.handle.net/10059/3217