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Preliminary analyses of these much longer corrosion tests show a thin deposit on the inside of the sample tube that is quite uniform along its length. This is similar to the observations seen in the initial sample (tested at the same temperature, 1000oC, but much higher pressure – 3000 psi). The surface deposit exhibited a green tint indicating the formation of nickel or chrome oxide on the inside walls of the samples. No indications of rapid corrosion mechanisms were observed (i.e. pitting, intergranular corrosion, spallation, etc). Following metallographic preparation, the corrosion layer was found to actually consist of two separate layers, the greenish outer layer and a much thinner layer adjacent to the base metal. Figure 24 shows this thin corrosion layer adjacent to the base metal. The green outer layer was quite soft and was inadvertently removed during metallographic preparation. Efforts are underway to stabilize the green outer layer during metallographic preparation so chemical analysis can be performed on both this layer and the thin layer adjacent to the base metal. The thickness of the two corrosion layers was measured for the three samples exposed to supercritical CO2. The time-averaged corrosion rate for each sample was then calculated and reported in units of mm/year. Figure 25 shows the time-average corrosion rate as a function of exposure time for the combined corrosion layer (outer green layer plus the thinner layer adjacent to the base metal). At short exposure times the corrosion rate is quite high but as the exposure time increases the time-average corrosion rate decreases to quite low values. Therefore, it would appear that the growing corrosion layer provides protection from further corrosion. REMENANTS OF GREEN LAYER Mounting media Thin corrosion layer Base Metal (MA 754) Total Corrosion layer thickness Figure 24. Optical micrograph showing the inner wall of a MA 754 tube exposed to supercritical CO2 for 335 hours. The thin corrosion adjacent to the base metal is shown. Remnants of the soft green outer layer (largely removed during sample preparation) are also seen. 26PDF Image | Development of a Supercritical Carbon Dioxide Brayton Cycle: Improving PBR Efficiency and Testing Material Compatibility
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