The effect of spraying temperature on the corrosion and wear behavior of HVOF thermal sprayed WC-Co coatings |
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| Affiliation: | 1. Department of Welding Technology and Engineering, School of Materials Engineering, Shanghai University of Engineering Science, Shanghai 201620, China;2. Division of Surface Engineering, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China;1. Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH), 790-784 Pohang, Republic of Korea;2. National Institute for Nanomaterials Technology (NINT), POSTECH, 790-784 Pohang, Republic of Korea;1. Silesian University of Technology, Institute of Materials Science, 40-019 Katowice, ul. Z. Krasińskiego 8, Poland;2. University of Modena and Reggio Emilia, Department of Engineering “Enzo Ferrari”, via P. Vivarelli 10/1, 41125 Modena, (MO), Italy;1. Dipartimento di Ingegneria “Enzo Ferrari”, University of Modena and Reggio Emilia, Via Pietro Vivarelli 10/1, I-41125 Modena (MO), Italy;2. Fraunhofer-Institut für Werkstoff- und Strahltechnik (IWS), Winterbergstr. 28, D-01277 Dresden, Germany;3. Department of Materials Science, Tampere University of Technology, Korkeakoulunkatu 6, FI-33720 Tampere, Finland;4. Department of Engineering Science, University West, Gustava Melins gata 2, SE-461 86 Trollhättan, Sweden;1. Institute of Materials Engineering, Technische Universität Dortmund, Leonhard-Euler-Str. 2, 44227 Dortmund, Germany;2. Institute of Machining Technology, Technische Universität Dortmund, Baroper Str. 301, 44227 Dortmund, Germany |
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| Abstract: | Cobalt matrix carbides are favorite cases of wear and corrosion-resistant coatings. Among thermal spray processes the high-velocity oxy-fuel (HVOF) spraying is a popular choice because of its unique properties. In this paper the effect of particles’ temperature on the porosity, corrosion as well as wear behavior of high-velocity oxy-fuel (HVOF) thermally sprayed WC-12Co coating has been studied. The temperature of particles was measured using a Spray-Watch diagnostic system. Also the scanning electron microscopy (SEM), image analysis, and X-ray diffraction (XRD) were used for examining the powder and the coating. The corrosion potential and corrosion current density was evaluated using potentio-dynamic polarization test. Results show that the porosity is affected by thermal flow on the coating surface. Besides, a higher particle temperature resulted in achieving more amorphous phases and eventually the higher corrosion resistance. Sample A was coated with an impact temperature of 2012.4 °C. Although the porosity was higher than other sprayed samples (1.7%), the higher content of amorphous phase led to recording a higher corrosion resistance (64.3E-6A). Sample B was coated with an impact temperature of 1880 °C for which the Jcorr was 67.2E-6 A. Sample C was sprayed with a low impact temperature of 1702 °C for which a surface porosity of 1% and the low corrosion resistance of 79.5E-6A were recorded. Based on the experiments it was concluded that for the WC-12Co coating the corrosion resistant phases have the dominant influences on the corrosion resistance. |
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| Keywords: | HVOF WC-Co Corrosion Porosity Temperature Wear |
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