| About this Abstract |
| Meeting |
MS&T23: Materials Science & Technology
|
| Symposium
|
Computation Assisted Materials Development for Improved Corrosion Resistance
|
| Presentation Title |
Phase Field Modeling of Molten Salt Dealloying Corrosion of NiCr Alloys |
| Author(s) |
Nathan Bieberdorf, Xueyang Wu, Laurent Capolungo, Mark Asta |
| On-Site Speaker (Planned) |
Nathan Bieberdorf |
| Abstract Scope |
Metals in contact with molten salt have been shown to corrode via a dealloying process, where selective dissolution of the less-noble elements precedes the formation of a porous network in the base alloy. Variations in salt chemistry and metal microstructure have been observed to influence this corrosion process. However, a fundamental understanding of how these factors control the onset and growth of pores remains incomplete. In this work, we use an electrochemical phase field model to investigate dealloying corrosion of NiCr in molten fluoride salts. The model incorporates metal dissolution via redox potentials and activities for Ni and Cr in the salt, and pore formation is shown to depend strongly on solute transport rates in the metal, molten salt, and along their solid-liquid interface. We discuss how the mechanisms of pore formation can be controlled via the concentration of oxidants in the molten salt and the metal’s microstructure. |