The Effect of Oxide Coatings and Molten Salt Films on the Permeation of Hydrogen Through Metal Walls
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Calculations are reported which consider the effect of oxide coatings and molten salt films on the rate of permeation of hydrogen through metal. For the metal the permeation rate Q$$/$$A = PM (p1/2 — p$$^{1/2}_{o}$$) and for the coating Q$$/$$A = Po (p — po), where p and po, respectively, are the upstream and downstream pressures of hydrogen, and PM and PO are overall permeabilities measured when p = 1. At pressures above p = 1 the metal provides the major resistance to permeation until PO $$/$$PM < 1. At pressures below 1, the coatings become increasingly important and are the major resistance when PO$$/$$PM < 100 at p < 10-4. Curves of Q$$/$$PMA vs p for 10-3 < PO$$/$$PM < $$\infty$$ and 10-8 < p < 103 are provided that have use in analyzing experimental data and in considering application of the data to reactor systems. An oxide coating has been obtained on Incoloy 800 that shows promise for limiting the release of tritium to the steam system of a large MSBR to an acceptable amount.
- Research Organization:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- USDOE; US Atomic Energy Commission (AEC)
- DOE Contract Number:
- AC05-00OR22725
- OSTI ID:
- 1524621
- Report Number(s):
- CF-73-1-26
- Country of Publication:
- United States
- Language:
- English
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