In this paper, the corrosion characteristics of two HVOF-sprayed coatings made with self-fluxing NiCrSiB powders are assessed in the as-sprayed condition. One of the coatings is also investigated after post-spray treatment with polymer sealing and after vacuum furnace fusion. It was found that cracking at lamellar boundaries dominates the corrosion behavior of the layers in the as-sprayed and sealed states, while pitting corrosion resulting from the failure of hard phases plays the main role in the melted layer. Paper includes a German-language abstract.

high velocity oxyfuel spraying, microstructure, nickel-chromium-silicon-boron coatings, pitting corrosion, static corrosion test
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Copyright © 2002 Verlag für Schweißen und verwandte Verfahren DVS-Verlag GmbH. All rights reserved.
2002
Verlag für Schweißen und verwandte Verfahren DVS-Verlag GmbH
Topics
Microstructure Pitting corrosion Nickel-chromium alloys High-velocity oxyfuel spray coating Corrosion testing
Issue Section:
Surface Engineering via High Velocity Oxy-Fuel Spraying
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