Protective system for high temperature metal alloys

Details Protective system for high temperature metal alloys Protective system for high temperature metal alloys

C - Chemistry, Metallurgy

23

C

C23C 4/10 (2006.01) C23C 24/06 (2006.01) C23C 26/00 (2006.01) C23C 28/00 (2006.01)

Patent

CA 2348145

A method for protecting low-carbon steel and stainless steel, and particularly high temperature stainless steel, from coking and corrosion at elevated temperatures in corrosive environments, such as during ethylene production by pyrolysis of hydrocarbons or the reduction of oxide ores, by coating the stainless steel with a coating of MCrAlXSi in which M is nickel, cobalt, iron or a mixture thereof and X is yttrium, hafnium, zirconium, lanthanum, scandium or combination thereof. A blended powder composition to produce a desired MCrAlSiX surface alloy may be applied to the substrate. The overlay coating and stainless steel substrate preferably are heat-treated at about 1000 to 1200°C for about 10 minutes or longer to metallurgically bond the overlay coating to the substrate and to form a multiphased microstructure. The obtained surface alloyed structure is preferably aluminized by depositing a layer of aluminum thereon and subjecting the resulting coating to oxidation at a temperature above about 1000°C for a time effective to form an alumina surface layer.

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