|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||High Temperature Corrosion of Structural Materials
||Evaluating the Influence of CO2 Purity on the Corrosion of Structural Alloys for Supercritical CO2 Power Cycles
||Matthew Walker, Elizabeth Withey, Alan Kruizenga
|On-Site Speaker (Planned)
Structural alloy corrosion is a major concern for the design and operation of Supercritical CO2 power cycles. A critical shortcoming is that nearly all of the available alloy corrosion data was performed using high purity CO2 (research grade - 99.999% purity), while a commercial scale system is likely to use industrial grade CO2 with higher impurity concentrations (~99.5% purity). Furthermore, experimental investigations have been predominantly focused on characterizing surface oxidation, and have often neglected to examine samples for internal carburization. An experimental program was recently established to address these shortcomings. Results will be presented from a series of 1000 hour CO2 exposure experiments using both research purity and industrial purity CO2 at two temperatures relevant to Sodium Fast Reactor energy conversion systems (350oC and 600oC). The set of eight different structural alloys included in these experiments were characterized for surface oxide microstructure, internal carburization, and corrosion rate / lifetime predictions.
||Planned: Supplemental Proceedings volume