| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Environmentally Assisted Cracking: Theory and Practice
|
| Presentation Title |
Pitting Corrosion of Stainless Steel 304 in Concentrated MgCl2 Solution |
| Author(s) |
Xiaolei Guo, Yuxuan Shui, Irem Efe, Jenifer Locke, Gerald Frankel |
| On-Site Speaker (Planned) |
Xiaolei Guo |
| Abstract Scope |
The ambient air used to cool the stainless-steel canisters for the storage of spent nuclear fuel contains salt aerosols. These salts can deposit on the canister wall and form an aggressive aqueous brine after deliquescence from the reaction with humidity, thereby facilitating localized corrosion and the subsequent stress corrosion cracking. This work focuses on understanding the nucleation and propagation of pitting corrosion in a concentrated MgCl2 rich brine simulating the solution chemistry developed on the canister surface after deliquescence in a low relative humidity of 40%. Depending on potentials applied, a unique crosshatch or grannular pit morphology was rapidly created on the SS304 surface through electrochemical approaches. Additionally, corrosion was found to propagate preferentially in lateral directions, likely associated with the high concentration of salts present in the solution. Such morphology may have direct implications on the pit-to-crack transition because of the concentrated stress near the sharp pitting corrosion features. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Environmental Effects, Iron and Steel, Other |