| Abstract Scope |
Under Deposit Corrosion (UDC) poses a significant threat to the structural integrity of steam generator tubes in industrial plants, impacting safety, environment, and global economies. This project aims to unravel complex mechanisms underlying UDC, focusing on understanding the formation of a multilaminate scale.
High-pressure, high-temperature experiments were conducted to replicate conditions on a low Cr-Mo steel alloy (F11) to investigate the impact of critical system variables such as heat flux and chloride-/phosphate concentration. Using XCT, XRD, APT, and SEM-EDX, we characterized the corrosion products of F11 and elucidated changes in phase and morphology changes. Additionally, in-situ experiments at Diamond Light Source (DIAD beamline) provided real-time insight into the evolution of the oxide scale.
Our experiments successfully generated a characteristic duplex oxide scale containing an Cr-enriched layer, resembling UDC observed in industry. These findings unprecedented insights to the fundamental understanding of UDC, providing a basis for developing effective corrosion mitigation strategies. |