Redox mechanisms and metal fluoride stability in alkali fluoride corrosion -confirmed by experiment
Year: 2025
Type: article
Abstract: The corrosion behavior of Inconel 625 in contact with LiF was compared with its behavior in NaF at 600°C in air. Thermodynamic calculations were carried out to determine the stability of metal fluorides in both conditions. TOF-SIMS was conducted to examine the lithium-ion behavior in the oxide and metal over short-term and long-term exposures. A redox mechanism is suggested where fluoride ion ingress into the alloy is discussed. The diffusion of lithium ions is considered a passive process along cation diffusion paths. The suggested mechanism discusses also why the presence of fluorine gas in the corrosion process is not viable. The presented mechanism and energetic pathway are in full agreement with the experimental observations and can be easily transferred to other alkali fluoride experiments in literature.
Source: Corrosion Science
Authors: Aida Nikbakht, Per Malmberg, Behnam Bahramian, Christine Geers
Institutions: Chalmers University of Technology, Umicore (Belgium)
Language: English
Subfield: Fluid Flow and Transfer Processes
Field: Chemical Engineering
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $4,070
OpenAlex ID: W4417125082