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Title: Reaction rates and prediction of thermal instability during aluminum alloy 6061 dissolution

Journal Article · · Separation Science and Technology
 [1];  [1];  [1]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
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Here, chemical kinetics of dissolution of aluminum alloy 6061 was investigated for the processing of Pu-238 for deep space missions. The rate of dissolution was measured by the heat release and appeared to be controlled by the rate of release of Al(OH)4– from the metal surface. Rates of reaction were measured from 273 to 365 K, giving an activation energy of 72 ± 13 kJ•(mol Al)–1 and a pre-exponential factor of 5 ± 3 × 109 dm3mol–1min–1. Minor alloying elements did not appear to affect the reaction kinetics. The average heat of dissolution was –360 ± 70 kJ•(mol NaAlO2)–1. When extrapolated to an infinitely dilute solution of aluminum, kJ•(mol NaAlO2)–1.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1440837
Journal Information:
Separation Science and Technology, Vol. 53, Issue 12; ISSN 0149-6395
Publisher:
Taylor & FrancisCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 1 work
Citation information provided by
Web of Science

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Cited By (1)

Monitoring the Caustic Dissolution of Aluminum Alloy in a Radiochemical Hot Cell Using Raman Spectroscopy journal July 2020

Figures / Tables (12)

Table 1(p. 26)table Table 1
Table 2(p. 27)table Table 2
Table 3(p. 28)table Table 3
Table 4(p. 29)table Table 4
Table 5(p. 31)table Table 5
Table 6(p. 32)table Table 6
Figure 1(p. 35)figure Figure 1
Figure 2(p. 36)figure Figure 2
Figure 3(p. 37)figure Figure 3
Figure 4(p. 38)figure Figure 4
Figure 5(p. 39)figure Figure 5
Figure 6(p. 40)figure Figure 6

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
Aluminum alloy 6061 dissolution
kinetics of aluminum dissolution
neptunium target cladding dissolution
plutonium-238 production