Oxidation of a chromia-forming nickel base alloy at high temperature in mixed diluted CO/H2O atmospheres
Source abstract
Abstract
Abstract Corrosion of a chromia-forming nickel base alloy, Haynes 230 ® , has been investigated under impure helium containing a few Pa of CO and H 2 O at 900 °C. It has been found that this alloy reacts simultaneously with CO and H 2 O. Oxidation by CO has been revealed to occur mainly in the first hours. CO diffuses through the scale via short-circuit pathways and oxidizes Al, Cr and Si at the oxide/metal interface. Kinetics of CO oxidation has been investigated and several rate limiting steps are proposed. In the long term, H 2 O is the major oxidant of chromia-forming nickel base alloys in impure helium.
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Research context
OpenAlex topics: High-Temperature Coating Behaviors · Nuclear Materials and Properties · Turbomachinery Performance and Optimization
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