Activity gradient mass transport accelerated corrosion of stainless steel in molten salt

Falconer, Cody; Wang, Yafei; Sridharan, Kumar; Couet, Adrien

doi:10.1016/j.apmt.2023.101850

Activity gradient mass transport accelerated corrosion of stainless steel in molten salt

Journal Article · Fri Jun 02 00:00:00 EDT 2023 · Applied Materials Today

DOI:https://doi.org/10.1016/j.apmt.2023.101850· OSTI ID:2418302

^[1]; Wang, Yafei ^[2]; Sridharan, Kumar ^[3]; Couet, Adrien ^[3]

Univ. of Wisconsin, Madison, WI (United States); OSTI
Univ. of Wisconsin, Madison, WI (United States); Shanghai Jiao Tong Univ. (China)
Univ. of Wisconsin, Madison, WI (United States)

Advanced energy systems based on molten salt technologies have gained increasing interest, and their design and construction are likely going to involve the use of materials of dissimilar chemistries. With dissimilar materials being used, galvanic coupling induced corrosion acceleration is one of the mechanisms believed to be an issue for the deployment of molten salt systems. However, non-galvanic interaction mechanisms such as activity gradient mass transport have also been theorized to represent a potential challenge. Unfortunately, the two effects have often been compounded in the literature, such that it is still unclear which degradation mechanisms are at play in these systems. In the following study, electrochemical measurements are used to predict the effect that galvanic coupling would have on dissimilar materials submerged in the same molten salt medium. Dissimilar material salt exposure tests are then performed to investigate whether galvanic coupling or activity gradient driven processes account for the levels of materials degradation observed. Finally, these separate effect electrochemical and corrosion experiments uniquely elucidate the degradation mechanisms in dissimilar materials systems.

View Accepted Manuscript (DOE)

Research Organization:: Texas A & M Univ., College Station, TX (United States). Texas A & M Engineering Experiment Station

Sponsoring Organization:: USDOE Office of Nuclear Energy (NE)

Grant/Contract Number:: NE0008651

OSTI ID:: 2418302

Journal Information:: Applied Materials Today, Journal Name: Applied Materials Today Journal Issue: C Vol. 32; ISSN 2352-9407

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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