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Exposure of MA 754 to supercritical CO2 resulted in the formation of chromium oxide, the only thermodynamically stable compound at 1000oC in the presence of CO2. The growing corrosion layer appeared to reduce the corrosion rate to a value of 0.2 mm/year after 500 hours of exposure. However, exposure times were too short to determine the minimum corrosion rate for either coarse- or fine-grained MA 754. Near surface porosity developed, presumably from the diffusion of chromium out of the base metal, leaving behind porosity. No evidence of spalling of the corrosion layer or metal dusting was observed in this study, however, exposure times were relatively short. Although no evidence was obtained in this study to suggest that MA 754 is unsuitable for use in a supercritical CO2 Brayton cycle, longer term exposure tests are warranted to ensure breakaway corrosion processes, such as spalling or metal dusting, do not be come active prior to the end of the intended life cycle. The commercial high temperature alloy, I-617, was also included in the supercritical CO2 corrosion study. Only one relatively short (175 hours) experiment was completed during the project. The corrosion rate was approximately 25% of the value for MA 754 for the same exposure time. The corrosion rate found in this study is thought to represent transient behavior, i.e. the steady state corrosion rate was not obtained. Significant intergranular corrosion was found in I-617 whereas MA 754 exhibited relatively uniform surface corrosion. As with MA 754, the main corrosion product was the formation of chromium oxide. Again, longer term experiments/exposures are needed to fully characterize the long term corrosion behavior and the possibility of break away corrosion processes, such as spalling and dusting. ixPDF Image | Development Of A Supercritical Carbon Dioxide Brayton Cycle
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