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US 6,673,467 B2Granted
Metallic component with protective coating
AssigneeAlstom (Switzerland) Ltd
InventorsRichard Brendon Scarlin, Reinhard Knödler
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AssigneeAlstom (Switzerland) Ltd
InventorsRichard Brendon Scarlin, Reinhard Knödler
Estimating the term…
A metallic component exposed to high temperature steam is provided with a coating comprising a thin primer layer deposited on the surface of the metallic component and a thicker overlay layer on top of the primer layer. The primer layer consists of highly ductile, oxidation resistant material such that it remains free of any defects over a long period of exposure. The overlay layer consists of an oxidation resistant, less ductile, and low-cost material. It protects the thin primer layer from mechanical damage and chemical degradation. The primer layer protects the base material of the metallic component from oxidizing steam that may penetrate through cracks of the overlay layer. Due to suitable choice of coating materials and thicknesses of the layers the coating is low-cost.
A metallic component exposed to high temperature steam with a coating that protects the surface of the metallic component from oxidation and/or corrosion is claimed wherein
A metallic component exposed to high temperature steam, the metallic component comprising:
A metallic component exposed to high temperature steam with a coating that protects a surface of the metallic component from oxidation and/or corrosion, wherein the coating on the surface of the metallic component comprises one or more thin, oxidation resistant primer layers having a high ductility and being free of defects, and the coating comprises one or more lower ductility, oxidation resistant overlay layers deposited on top of the one or more primer layers and having overall a greater thickness than the primer layers, and wherein the overlay layer comprises a Ni—P-based alloy, an Al-based or Al—Si-based alloy, or a Cr-based alloy.
Dependencies are inferred from the claim text.