Method for producing elevated temperature corrosion...

Details Method for producing elevated temperature corrosion... Method for producing elevated temperature corrosion...

C - Chemistry, Metallurgy

23

F

117/53, 117/114.

C23F 15/00 (2006.01) C22C 30/00 (2006.01) B32B 15/01 (2006.01) F02C 7/30 (2006.01)

Patent

CA 1129266

-1- ABSTRACT METHOD FOR PRODUCING ELEVATED TEMPERATURE CORROSION RESISTANT ARTICLES A method for the production of metal articles resist- ant to corrosion at elevated temperatures. The method in- volves the application of a first coating on an article sur- face, this coating comprising a cobalt, iron or nickel alloy which is compatible with the substrate and which is ductile in character. A second coating highly resistant to corrosion at elevated temperatures is applied over the first coating to form a composite coating, and an elevated temperature treatment follows to provide interfacial bonding and to minimize the detrimental effects of thermal and mechanical stresses encoun- tered during use. The provision of a ductile first layer pro- vides a barrier against degradation of the corrosion resist- ance of the outer layer and serves as a barrier against detri- mental interdiffusion and crack propagation. Figure 1 of the drawings is a photomicrograph showing the composite coating.

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