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Fine-grained MA 754 Corrosion Behavior –The corrosion behavior of fine-grained material was investigated in the multi-sample system, Figure 4-10. A single experiment was performed on this material at 1000oC at 7 MPa for approximately 175 hours. (This system did not become fully operational until late in the project and only one, relatively short experiment could be performed.) The samples developed a black corrosion layer that was dissolved using Ox-Out 536 (ChemClean Corp.), a commercial descaling agent for nickel-based alloys. This allowed an accurate determination of the weight change due to corrosion and calculation of the corrosion rate, Table 4-5. The samples correspond to various surface finishes, i.e. 7A – 60 grit, 7B – 120 grit, 7D – 320 grit, 7E – 800 grit and 7F – as-received. As seen in Table 4-5, little variation in corrosion rate with surface finish is observed and the average corrosion rate for these five samples is 1.4 mm/year. This value for an exposure time of 175 hours has been plotted in Figure 4-12, as the blue triangle. This value is consistent with the large grained corrosion results for similar exposure times. This would imply that observed corrosion behavior is still in the transient region and that longer exposure times are needed to determine the steady-state corrosion rate to ultimately determine the suitability of this material for use in the high temperature Brayton cycle. Table 4-5. Corrosion Rate for Fine Grained MA 754 Sample ID Initial Wt, g Final Wt, g Change, g Length, mm Width, mm Thickness, mm Apparent Corrosion Rate*, mm/yr 7A 1.2991 1.2398 0.0593 13.26 7.89 1.49 1.32 7B 1.3165 1.2600 0.0565 13.34 7.91 1.49 1.24 7D 1.2763 1.2197 0.0566 13.27 7.86 1.47 1.27 7E 1.2007 1.1430 0.0577 13.27 7.87 1.38 1.31 7F 1.4647 1.3773 0.0874 13.32 7.85 1.68 1.89 * Exposure time = 175 hours Summary and Conclusions on the Corrosion Behavior of MA 754 in Supercritical CO2 – Two viable supercritical CO2 corrosion testing system were designed, fabricated and operated. One system allows the testing of a large number of samples (>200) during a single test while the other system consists of configuration closely resembling that expected in an operating system, e.g. a pipe configuration with gradients in temperature and stress imposed on the sample. During tests in these systems, MA 754 showed transient corrosion behavior even in the longest exposure time (~500 hours) used in this study. It appears the steady state corrosion rate will drop below ~0.2 mm/year at long exposure times which is approaching a level acceptable to the commercial sector. However, longer term experiments are required to ensure that other corrosion processes, such as spalling or metal dusting, do not eventually become the dominate corrosion process. The corrosion product is chromium oxide, the thermodynamically stable compound at 1000oC in the presence of CO2. No discernable difference in corrosion behavior between coarse-grained and fine-grained MA 754 in supercritical CO2 at 1000oC was observed. Task 3-3 Corrosion Behavior of I-617 in Supercritical CO2 Inconel 617 is a high temperature alloy with potential application to numerous high temperature components in the Next Generation Nuclear Plant (NGNP). This alloy possesses some of the best high temperature creep properties of the available metallic alloys. However, very little is known concerning the corrosion behavior of this alloy in high temperature, supercritical CO2. Therefore, this alloy was added to the corrosion investigation. Subtask 3-3-1 Corrosion rate Determination - Samples with different surface finishes were obtained and exposed to supercritical CO2 at 1000oC and 7 MPa for 175 hours. These samples were run in 71PDF Image | Development Of A Supercritical Carbon Dioxide Brayton Cycle
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