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Wear and Corrosion Behavior of HVOF-Sprayed WC-CoCr Coatings on Al Alloys

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Abstract

WC-CoCr coatings were HVOF-sprayed onto an AA6082T6 substrate. Thickness values between 50 and 150 μm were produced by stepwise increase of the number of torch scans. This increase made the coatings not only thicker but also denser. This was due both to peening effects and by modifications to the splat formation mechanism, investigated by focused ion beam technique. Thanks to such densification, the hardness, the wear and impact resistance, and the corrosion protectiveness of the layers increased with the number of torch scans. The largest improvement occurred from 2 to 3 torch scans. These coatings were also compared to anodized films: cermets had superior wear and impact resistance but offered less corrosion protection.

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Acknowledgments

The authors wish to acknowledge the production of the HVOF-sprayed cermet coatings by Ing. Fabrizio Casadei, Mr. Francesco Barulli, Mr. Edoardo Severini, and Mr. Carlo Costa, Centro Sviluppo Materiali S.p.A., Roma, Italy. Thanks to Dr. Roberto Giovanardi for the assistance with corrosion testing and to Dr. Maria Cannio for the ICP analyses. We are grateful to Mr. Fabio Pighetti Mantini and to Ing. Andrea Bassani for their assistance with part of the experimental activity. We also acknowledge Dr. Enrico Gualtieri for providing the SEM micrographs and FIB sections of single splats. Thanks to Mr. Gadda (Mochem s.r.l., Modena, Italy) for performing the anodization treatments. This study was partly supported by PRRIITT (Regione Emilia-Romagna), Net-Lab “Surface & Coatings for Advanced Mechanics and Nanomechanics” (SUP&RMAN).

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Authors and Affiliations

  1. Department of Mechanical Engineering, University of Rome “Tor Vergata”, Via del Politecnico 1, 00133, Rome, Italy

    M. Barletta

  2. Department of Materials and Environmental Engineering, University of Modena and Reggio Emilia, Via Vignolese 905, 41100, Modena, MO, Italy

    G. Bolelli, B. Bonferroni & L. Lusvarghi

Authors
  1. M. Barletta
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  2. G. Bolelli
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  3. B. Bonferroni
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  4. L. Lusvarghi
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Corresponding author

Correspondence to L. Lusvarghi.

Additional information

This article is an invited paper selected from presentations at the 2009 International Thermal Spray Conference and has been expanded from the original presentation. It is simultaneously published in Expanding Thermal Spray Performance to New Markets and Applications: Proceedings of the 2009 International Thermal Spray Conference, Las Vegas, Nevada, USA, May 4-7, 2009, Basil R. Marple, Margaret M. Hyland, Yuk-Chiu Lau, Chang-Jiu Li, Rogerio S. Lima, and Ghislain Montavon, Ed., ASM International, Materials Park, OH, 2009.

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Barletta, M., Bolelli, G., Bonferroni, B. et al. Wear and Corrosion Behavior of HVOF-Sprayed WC-CoCr Coatings on Al Alloys. J Therm Spray Tech 19, 358–367 (2010). https://doi.org/10.1007/s11666-009-9387-1

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