WC-CoCr coatings were HVOF-sprayed onto an AA6082T6 substrate. Thickness values between 50 Î¼n and 150 Î¼n were produced by stepwise increase of the number of torch scans. This increase makes the coatings not only thicker, but also denser. This is due both to peening effects and by modifications to the splat formation mechanism, investigated by FIB. Thanks to such densification, the hardness, the wear and impact resistance and the corrosion protectiveness of the layers increase with the number of torch scans. The largest improvement occurs from 2 to 3 torch scans. These coatings were also compared to anodized films: cermets have superior wear and impact resistance but offer less corrosion protection. Copyright Â© 2009 ASM InternationalÂ® All rights reserved.
Wear and corrosion behaviour of HVOF-sprayed WC-CoCr coatings on Al alloys / Bolelli, G.; Lusvarghi, L.; Barletta, M.; Karhail, V.. - (2009), pp. 1163-1168. (Intervento presentato al convegno Expanding Thermal Spray Performance to New Markets and Applications - 2009 International Thermal Spray Conference, ITSC 2009 tenutosi a Las Vegas, NV, usa nel 2009) [10.1361/cp2009itsc1163].