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The effect of post-treatment of a high-velocity oxy-fuel Ni-Cr-Mo-Si-B coating Part I: Microstructure/corrosion behavior relationships

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Abstract

The microstructure and aqueous corrosion characteristics of a Ni-Cr-Mo-Si-B high-velocity oxy-fuel (HVOF) coating have been assessed. It has been shown that postprocessing by vacuum fusion has a significant effect on the coating microstructure by increasing the type and concentration of hard phase particles. The principal hard phases in the as-sprayed condition and vacuum-sealed condition are chromium carbides, whereas molybdenum-containing boride phases are also present after vacuum fusion. Vacuumfusion post-treatment eliminates splat boundaries, which can act as sites, where preferential corrosion can occur and, hence, the dominant corrosion mechanisms change. In as-sprayed and vacuum-sealed coatings, localized attack at splat particle boundaries and crevice corrosion dominate, whereas in vacuum-fused coating, the principal mechanism of corrosion is “micropitting” as a result of the hard phase loss.

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Authors and Affiliations

  1. Department of Mechanical Engineering, University of Glasgow, G12 8QQ, Glasgow, Scotland, United Kingdom

    S. Shrestha & T. Hodgkiess

  2. Department of Mechanical and Chemical Engineering, Heriot-Watt University, EH14 4AS, Edinburgh, Scotland, United Kingdom

    A. Neville

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  1. S. Shrestha
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  2. T. Hodgkiess
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  3. A. Neville
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Shrestha, S., Hodgkiess, T. & Neville, A. The effect of post-treatment of a high-velocity oxy-fuel Ni-Cr-Mo-Si-B coating Part I: Microstructure/corrosion behavior relationships. J Therm Spray Tech 10, 470–479 (2001). https://doi.org/10.1361/105996301770349240

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  • DOI: https://doi.org/10.1361/105996301770349240

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