About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
|
Symposium
|
Materials and Chemistry for Molten Salt Systems
|
Presentation Title |
Corrosion Resistance of Steel and Nickel Alloys in Molten Nitrate Salt |
Author(s) |
Andrew Dong, Camilla Stitt, Peter Hosemann, George Young |
On-Site Speaker (Planned) |
Andrew Dong |
Abstract Scope |
Solar salt (60%NaNO3-40%KNO3) is being investigated for use as an intermediate heat transfer fluid in the Kairos Power fluoride salt-cooled high-temperature reactor (KP-FHR). Significant operational experience with nitrate salt at lower temperatures (≤550°C) exists due to its use in concentrated solar applications. However, at temperatures around and above 600°C, elevated corrosion rates in structural alloys are observed, associated with thermal decomposition of the nitrate salt. This presentation will discuss examination into the corrosion resistance of various iron- and nickel-based alloys exposed to molten nitrate salt at temperatures around the salt decomposition temperature. Weight change and microscopy data on metal coupons submerged in static nitrate salt for around 600 hours at 630°C will be presented. Observed corrosion rates and corrosion scales will be compared between the various alloys and overall conclusions will be discussed. |
Proceedings Inclusion? |
Planned: |
Keywords |
Environmental Effects, High-Temperature Materials, Characterization |