| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1657894 | Surface and Coatings Technology | 2013 | 11 Pages |
•Particle temperature and velocity have a significant effect on the coating quality.•HVOF parameters must allow a sufficient melting of the WC–CoCr agglomerates.•Moderate decarburization of WC is helpful for the corrosion resistance of coating.•Corrosion of the metallic CoCr binder phase is the principal corrosion mechanism.
High-velocity oxy-fuel (HVOF) spray techniques can produce cermet coatings for applications that require corrosion resistant surfaces. The aim of this study was to investigate the influence of different oxygen/fuel ratios on velocity and temperature of flying particles and establish the effects on the coatings quality in relation to the corrosion behavior of HVOF WC–CoCr coating in a 0.1 N HCl. The results show that in-flight particle characteristics have a significant effect on the porosity, hardness and corrosion resistance. The highest corrosion resistance is obtained with those parameters that allow a sufficient melting of the agglomerates while minimizing the decarburization of the WC particles.
