Microstructure and electrochemical properties of nanostructured WC–10Co–4Cr coating prepared by HVOF spraying

Ultrasonic cavitation erosion of high-velocity oxygen-fuel (HVOF) sprayed near-nanostructured WC–10Co–4Cr coating in NaCl solution

“…1(b) that some pores are visible as very dark regions in the coating. The average porosity value of the coating is less than 1% by the image analysis, which is in accord with the results observed in previous investigations of other HVOF sprayed coatings [21,22,[28][29][30]. TEM and HRTEM were undertaken to investigate more detailed microstructural information at a finer scale of the coating.…”

“…2(b). The diffraction pattern indicates that the WC phase is indexed to a hexagonal structure with the incident beam parallel to the zone axis of [1 0 0], which is in good agreement with the XRD result [22]. Fig.…”

“…The coating exhibited better corrosion resistance than the hard chromium coating in 3.5 wt.% NaCl solution [22]. This work is an extension of the reported research.…”

“…The powder used for this work was a commercial nanocrystalline WC grain in a near-nanostructured WC-10 wt.% Co-4 wt.% Cr cermet system, which had a particle size distribution of 5-45 lm agglomerated by the fine particles (100-500 nm) and exhibited nearly spherical particle shape [22]. Stainless steel 1Cr18Ni9Ti was used as the substrate.…”

Effect of ultrasonic cavitation erosion on corrosion behavior of high-velocity oxygen-fuel (HVOF) sprayed near-nanostructured WC–10Co–4Cr coating

“…e l s e v i e r . c o m / l o c a t e / u l t s o n Previously, a near-nanostructured WC-10Co-4Cr coating was synthesized successfully by HVOF spraying process and the microstructure, corrosion and cavitation erosion behavior in 3.5 wt.% NaCl solution was reported [14,15]. The results indicated that the main failure mechanism during cavitation erosion of the coating was erosion of the binder phases, brittle detachment of hard phases and formation of corrosion products.…”