Technical Progress Report
During the past quartile (two month period) most attention has been concentrated on the problem of definition critical temperature at which ''wet'' corrosion first became operable. It has been shown that, in principle, ''wet'' corrosion processes can not be ignored for Yucca Mountain, even for initial times, when the temperature of the surface of containers is well above the boiling temperature of water for the prevailing conditions. This is because the surfaces are covered by highly hydrophilic oxides (e.g. Fe{sub 2}O{sub 3}, NiO, Cr{sub 2}O{sub 3}) that will hydrate to the form of corresponding hydroxides, which are proton conductors, at least when in the ''wet'' condition. Because proton conduction and the presence of ''bound'' water are all that are required for the external environment to support metallic corrosion in either its general or localized form. Thus, the temperature of dehydration of the hydroxide, e.g. M(OH){sub 2} {yields} MO + H{sub 2}O(g), is a better criterion for the upper temperature limit for ''wet'' corrosion than is the boiling temperature of ''bulk'' water. During this first task, we have reviewed the existing thermodynamic data base for the dehydration of metal hydroxides and analytical expressions have been developed that allow the upper temperature limit to be estimated.
- Research Organization:
- SRI International, Menlo Park, CA (US)
- Sponsoring Organization:
- US Department of Energy (US)
- DOE Contract Number:
- FG03-99SF21884
- OSTI ID:
- 762156
- Resource Relation:
- Other Information: PBD: 30 Oct 1999; PBD: 30 Oct 1999
- Country of Publication:
- United States
- Language:
- English
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