Abstract
Due to susceptibility of carbon steels under flow-accelerated corrosion environments, 2.25Cr-1Mo has been adopted as replacement. However, the mechanism of enhancement in the passivity has not been completely elucidated. We employed synchrotron scanning transmission X-ray microscopy to test the microstructure and chemistry of the alloys after flow-accelerated corrosion tests at 150 °C. Carbon steel exhibited a mixture of Fe2+ and Fe3+ states as a passive layer while 2.25Cr-1Mo presented two oxide layers composed of Fe2O3, Fe3O4, and FeO. A small quantity of Cr2O3 was observed which was not enriched. Furthermore, Mo was not observed in the oxide layer of 2.25Cr-1Mo.
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