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appears that at exposure times less than 500 hours the material is still in a transient corrosion mode where corrosion layers are being developed that ultimately provide protection from further corrosion. After 500 hours the corrosion rate is less than about 0.2 mm/year. Longer exposures may yield even lower corrosion rates, although spalling (not observed in this study) may occur, resulting in an increase in the corrosion rate. Exposure times greater than 1000 hours need to be performed to ensure the corrosion rate remains low and that other mechanisms like spalling or dusting do not lead to unsuitable corrosion behavior. 5 4.5 4 3.5 3 2.5 2 1.5 1 0.5 0 Fine Grained Materials 0 100 200 300 400 Exposure time, hours 500 600 Figure 4-12. Corrosion rates of coarse-grained MA 754 in supercritical CO2 at 1000oC and 10 MPa as a function of exposure time. The corrosion rate for fine grained MA 754 is shown as a blue triangle. Metallographic samples were observed in the SEM. Photomicrographs representative of three locations along the pipe are shown in Figure 4-13, from the water-cooled connection, Fig. 4-13a, to the pipe center, Fig. 4-13c. Corrosion is more evident as one approaches the midpoint of the tube where the temperature was the greatest (1000oC). Close to the water-cooled ends, Figure 4-13a, the corrosion products appear to adhere to the base metal quite well while the corrosion products near the mid-point of the tube, Figure 4-13c, exhibit considerable porosity. The base metal also shows the development of porosity under the corrosion layer. Elemental analysis of the corrosion products was conducted on the 50- 75 mm length sample. Five different spots, Figure 4-14, were selected and analyzed by EDS analysis to qualitatively determine the elemental species present in the corrosion product. From the analysis it was evident that chromium was being preferentially oxidized during the exposure to supercritical CO2. The outer 67 Corrosion Rate, millimeters/yearPDF Image | Development Of A Supercritical Carbon Dioxide Brayton Cycle
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