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. 2023 Nov 1;16(21):7003.
doi: 10.3390/ma16217003.

Effect of Cobalt and Chromium Content on Microstructure and Properties of WC-Co-Cr Coatings Prepared by High-Velocity Oxy-Fuel Spraying

Qun Wang  1 , Yuan Zhong  1 , Haifeng Li  2 , Shaoyi Wang  3 , Jianwu Liu  2 , Yiwei Wang  2 , Chidambaram Seshadri Ramachandran  4
Affiliations

Effect of Cobalt and Chromium Content on Microstructure and Properties of WC-Co-Cr Coatings Prepared by High-Velocity Oxy-Fuel Spraying

Qun Wang et al. Materials (Basel). .

Abstract

To explore the Co/Cr ratio impact on the high-velocity oxygen fuel (HVOF)-sprayed WC-Co-Cr coatings microstructure and performances, three kinds of WC-Co-Cr coatings, namely WC-4Co-10Cr, WC-7Co-7Cr, and WC-10Co-4Cr, were prepared by using a high-velocity oxygen fuel (HVOF) spraying process. The three coatings' phase composition, microstructure, basic mechanical properties, abrasive wear, and corrosion resistance were investigated. The results show that all three WC-Co-Cr coatings comprise the main phase WC, minor W2C, and amorphous W-Co-Cr phase, besides the WC-4Co-10Cr coating containing a small amount of CrxCy phase. In addition, WC-7Co-7Cr coating exhibited the highest hardness and abrasive wear resistance, followed by WC-10Co-4Cr and WC-4Co-10Cr coatings. The corrosion resistance as a hierarchy was found to be WC-10Co-4Cr > WC-7Co-7Cr > WC-4Co-10Cr.

Keywords: WC-Co-Cr; abrasive wear; corrosion; high-velocity oxygen fuel spraying.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
Cross-sectional morphologies of the (a,b) WC-4Co-10Cr, (c,d) WC-7Co-7Cr, and (e,f) WC-10Co-4Cr powders.
Figure 1
Figure 1
Cross-sectional morphologies of the (a,b) WC-4Co-10Cr, (c,d) WC-7Co-7Cr, and (e,f) WC-10Co-4Cr powders.
Figure 2
Figure 2
X-ray diffraction (XRD) patterns of WC-Co-Cr powders and resultant coatings (the -P and -C at the end of each curve indicate powder and coating, respectively).
Figure 3
Figure 3
SEM images of the cross-sectional of the (a,d) WC-4Co-10Cr, (b,e) WC-7Co-7Cr, and (c,f) WC-10Co-4Cr coatings ((d–f) are the enlarged images of the red box areas shown in (a–c), respectively).
Figure 4
Figure 4
Co-Cr binary phase diagram (BCC: body-centred cubic, FCC: face-centred cubic, HCP: hexagonal close packing, Co: Cobalt, Cr: Chrome).
Figure 5
Figure 5
Polarization curves of the three WC-Co-Cr coatings and 16Mnsteel substrate in 3.5% NaCl solution.
Figure 6
Figure 6
Corrosion surfaces of the coatings after electrochemical corrosion in static 3.5 wt.% NaCl solution: (a) WC-4Co-10Cr, (b) WC-7Co-7Cr, and (c) WC-10Co-4Cr coatings and EDS mapping of the area marked by red rectangle: (d) W, (e) Co, (f) Cr, (g) O.
Figure 7
Figure 7
The abrasive wear rate of the three WC-Co-Cr coatings.
Figure 8
Figure 8
Abrasive wear surface morphologies of the HVOF-sprayed (a) WC-4Co-10Cr, (b) WC-7Co-7Cr, and (c) WC-10Co-4Cr.
See this image and copyright information in PMC

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