Inconel®625 oxidation in CO2: Kinetics and reaction mechanism
Source abstract
Abstract
Inconel®625 oxidizes in CO 2 from about 750 °C. The reaction, studied at the beginning, does not depend on the CO 2 pressure. Between 900 and 1000 °C, and for weight increases < 0.5 mg/ cm², the oxidation is parabolic forming chromia layers. The components nickel and molybdenum do not oxidize. The apparent activation energy is 310 ± 18 kJ / mol. Unlike what is usually admitted for the oxidation of chromia-forming alloys, the chromia layer does not protect the alloy, the limiting step of the oxidation being the outwards diffusion of chromium inside the alloy, not inside the oxide layer.
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Research context
OpenAlex topics: Catalytic Processes in Materials Science · High-Temperature Coating Behaviors · Nuclear Materials and Properties
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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