Corrosion studies of ternary zirconium alloys in high-temperature water and steam /
R. D. Misch and C. Van Drunen.
Description
- Language(s)
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English
- Published
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Argonne, Ill. : Argonne National Laboratory, Metallurgy Division, 1961.
- Summary
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Examination of the oxide film from alloys containing scandium and molybdenum showed only monoclinic ZrO2. It is believed that stabilization of this form of ZrO2 instead of the cubic or tetragonal forms is a factor in promoting corrosion resistance. In this way the protective character of the film can be improved independently of the addition of cathodes.
A number of zirconium alloys were prepared in which scandium or yttrium were paired with elements capable of a +5 or +6 valence. The ternary alloys containing scanadium were superior to the alloys combining yttrium. The alloys containing scandium plus molybdenum, tantalum, or tungsten had relatively long lifetimes in steam at 540 deg C and 600 psi as compared with other alloy combinations, including Zircaloy-2.
The alloying of zirconium to improve corrosion resistance has an empirical basis, and satisfactory explanations for the alloying effects are not available. A theory of compensating valencies in the corrosion oxide is proposed, in which cations of lower and higher valence than zirconium (+4) are present in ratios such that electrostatic neutrality is ensured. An example is an alloy containing equimolar amounts of scandium (+3) and niobium (+5).
- Note
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"Operated by the University of Chicago under Contract W-31-109-eng-38."
At head of title: Argonne National Laboratory.
"July 1961."
- Physical Description
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37 pages :
illustrations, tables ;
28 cm
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