The Kinetics of the Coherent Stage of Hydroxide Corrosion on Li2O-Covered LiH

Matt, Sarah M.; Saw, Cheng K.; McLean II, W.; Dinh, Long N.

doi:10.1021/acs.jpcc.5c06152

The Kinetics of the Coherent Stage of Hydroxide Corrosion on Li₂O-Covered LiH

Journal Article · Fri Oct 24 00:00:00 EDT 2025 · Journal of Physical Chemistry. C

DOI:https://doi.org/10.1021/acs.jpcc.5c06152· OSTI ID:3000703

Matt, Sarah M. ^[1]; Saw, Cheng K. ^[1]; McLean II, W. ^[1]; ^[1]

Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

The capability to model LiOH growth on vacuum-baked LiH is a necessary precursor to making kinetic predictions of undesirable hydrogen outgassing from corroded LiH materials when placed in sealed-system applications. Here, in this work, LiH samples with initial LiOH surface corrosion layers less than 1.1 μm were outgassed by vacuum baking at high temperature to convert LiOH to Li₂O. Diffuse-reflectance infrared Fourier transform (DRIFT) spectroscopy was used to measure the subsequent LiOH regrowth during exposure to 25–375 ppm of H₂O vapor at room temperature. Logarithmic kinetics best model the growth of this coherent hydroxide corrosion layer (up to 1.5 μm) on previously vacuum-baked LiH samples. The logarithmic kinetics are attributed to the dissociation of H₂O on the corrosion layer and the establishment of a H⁺/OH^– electric field across the thickening LiOH corrosion layer. A time-dependent model of LiOH corrosion growth as a function of both initial LiOH thickness before vacuum baking and moisture partial pressures during re-exposure was developed to help researchers better assess the unwanted hydrogen outgassing potential from LiH/LiD materials.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 3000703

Report Number(s):: LLNL--JRNL-2009341

Journal Information:: Journal of Physical Chemistry. C, Journal Name: Journal of Physical Chemistry. C Journal Issue: 44 Vol. 129; ISSN 1932-7455; ISSN 1932-7447

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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