Abstract
Superalloys Inconel 718 and Inconel 625 were exposed for 3000 h to various corrosive oxidizing and reducing environments typically found in carbonate fuel cells. The corroded specimens were characterized in terms of their corrosion scale morphology, composition, and phases. The alloys have excellent oxidation resistance and scale adherence in the oxidizing cathode environment. A mechanism governing the formation of the multi-layered corrosion scale formed in the fuel-exit atmosphere of carbonate fuel cells is discussed.
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