| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Materials and Chemistry for Molten Salt Systems
|
| Presentation Title |
H-15: Electrochemical Impedance Spectroscopic Study of Oxide Scales on 316L Stainless Steel in Molten FLiNaK Salt |
| Author(s) |
Jie Qiu, Peter Hosemann, Digby Macdonald, John Scully |
| On-Site Speaker (Planned) |
Jie Qiu |
| Abstract Scope |
316L stainless steel (SS) were pre-oxidized in hot air and then immersed in molten FLiNaK salt at 700 oC for electrochemical experiments. The impedance of oxide films on 316L SS as a function of exposure time were investigated using electrochemical impedance spectroscopy (EIS). The results show that the resistance of the oxide film decreases with increasing the exposure time, due to the dissolution of the Fe and Cr elements into the molten FLiNaK salt. After experiments, the structures of the oxide film were characterized and compared. The defect density within the oxide film as a function of exposure time was estimated by interpretation of the EIS spectrums in the framework of the Point Defect Model (PDM), which has been successfully applied for extraction kinetic properties of oxide film. The dissolution mechanism of the oxide film on 316L SS in molten fluoride salt were calculated and discussed. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |