An afa alloy with a repairable regenerative oxide film and a method for self-repairing and regenerating the oxide film thereof

Abstract

The application discloses an AFA alloy with a repairable and regenerative oxide film and a method for self-repairing and regenerating the oxide film of the AFA alloy. After the surface diffusion channel construction treatment is performed on the AFA alloy, a two-step pre-oxidation treatment is performed in a low oxygen partial pressure atmosphere, so that a continuous and dense Al2O3 initial protective film is formed on the surface of the AFA alloy. During the service process or the maintenance period, when the Al2O3 film is cracked or partially peeled off under the action of thermal cycling, decoking switching or mechanical damage, the temperature and time of the self-repairing and regenerating stage are regulated, so that selective oxidation of the damaged area is preferentially generated, and continuous regenerative Al2O3 covering connected with the original film is realized, thereby reducing the risk of local failure expansion after the film cracking or peeling, and improving the comprehensive performance of anti-coking, anti-oxidation and anti-carburization.

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