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US 7,678,471 B2Granted
Surface modification to improve fireside corrosion resistance of Fe-Cr ferritic steels
AssigneeUchicago Argonne, LLC
InventorsJong-Hee Park, Krishnamurti Natesan, David L. Rink
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Abstract
An article of manufacture and a method for providing an Fe—Cr ferritic steel article of manufacture having a surface layer modification for corrosion resistance. Fe—Cr ferritic steels can be modified to enhance their corrosion resistance to liquid coal ash and other chemical environments, which have chlorides or sulfates containing active species. The steel is modified to form an aluminide/silicide passivating layer to reduce such corrosion.
Claims14
An article of manufacture, comprising:
- an Fe—Cr ferritic steel substrate;
- a passivating layer having a composition selected from the group consisting of an Fe—Cr aluminide and an Fe—Cr silicide, the passivating layer formed by reaction of aluminum or silicon with the Fe—Cr ferritic steel substrate in the presence of lithium wherein a lithium solid is melted and the Fe—Cr ferritic steel and aluminum or silicon react to form a surface-modified layer on the Fe—Cr ferritic steel substrate;
- and
- residual lithium present on the passivating surface layer.
1 more element
Dependencies are inferred from the claim text.