Corrosion of A New Nickel Base Superalloy in Coal--Fired Boiler Environments

Acta Metall Sin

2004, Vol. 40

Issue (6): 659- DOI:

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Corrosion of A New Nickel Base Superalloy in Coal--Fired Boiler Environments

ZHAO Shuangqun; XIE Xishan; Gaylord D. Smith

High Temperature Materials Research Laboratories; University of Science and Technology Beijing; Beijing 100083

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ZHAO Shuangqun; XIE Xishan; Gaylord D. Smith. Corrosion of A New Nickel Base Superalloy in Coal--Fired Boiler Environments. Acta Metall Sin, 2004, 40(6): 659-.

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Abstract The corrosion behavior and mechanism of a new nickel base superalloy have been studied at 550℃ and 700℃ in the synthetic coal ash/flue gas environments. The results indicate that low temperature hot corrosion of the alloy occurs at 550℃ and develops as pitting attack resulted from sulfidation mechanism. The frontal attack at 700℃ consists of two successive stages. The corrosion of specimen follows the oxidation and sulfidation mechanism during the initial stage. The protective Cr2O3film forms on the surface of the alloy and the internal sulfidation takes place. The severe low temperature hot corrosion happens due to the presence of molten CoSO4 during the accelerated stage. The porous and loose external scale and the compact internal scale consist of spinels and oxides, respectively. The sulfides of Cr, Ti and Nb precipitate at the front of oxides and in Cr—depletion zone. The rapid degradation of corrosion resistance of the alloy is attributed to the dissolution of both cobalt and cobalt oxide on the surface.

Key words: nickel base superalloy coal ash-flue gas low temperature hot corrosion

Received: 20 June 2003

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