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Pipe Sample Resistance Furnace Furnace Figure 4-11. Schematic of second CO2 corrosion system utilizing the sample in a form of a pipe. The sample acted as the pressure boundary. Subtask 3-2-2 Corrosion Testing of MA 754 in Supercritical CO2 - Both coarse-grained and fine- grained MA 754 was subjected to corrosion testing in supercritical CO2. Since the coarse-grained material would most likely be the condition used to satisfy the creep requirements, most of the corrosion behavior characterization was focused on the coarse-grained material. Coarse-grained MA 754 Corrosion Behavior - Corrosion testing of the coarse-grained material was carried out in the system that utilized the sample in the form of a pipe. Unfortunately MA 754 in the form of pipe could not be obtained from a commercial vendor. Therefore, rods of MA 754 were machined from an extrusion of rectangular cross section with the axis of the rod parallel to the extrusion direction. The rods were then drilled through their length to produce a pipe with an OD of approximately 12.5 mm and an ID of 4.3 mm for the flowing supercritical CO2. Four samples were exposed to flowing supercritical CO2 for 47, 120, 335 and 500 hours at 1000oC and 10 MPa. After exposure, samples were cut from the tube at 25 mm intervals along the tube length. The cross-sections were cut longitudinally to expose the inner corroded surface. The samples were then mounted, polished, and analyzed utilizing a SEM. Higher corrosion rates were observed in the sample taken from between 50 and 75 mm compared that observed in the sample taken between 0 and 25 mm (75 mm is the mid point of the tube). This was expected since the first 50 mm are housed in a water-cooled, high pressure gas connector and the temperature was much less than 1000oC. Conversely, the section of pipe between 50 and 75 mm experienced a temperature close to 1000oC, i.e. a steep temperature gradient existed from the water-cooled connector to the mid point of the tube. Figure 4-12 plots the measured corrosion rate of the coarse grained MA 754 as a function of exposure time. (Corrosion layer thickness measurements for calculation of the corrosion rate were always recorded at the midpoint of the tube.) At short exposure times the corrosion rate is quite high but as the exposure time increases the time-averaged corrosion rate quickly decreases to relatively low values. It 66 Vent to AtmospherePDF Image | Development Of A Supercritical Carbon Dioxide Brayton Cycle
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