ORNL-1816 - the Molten Salt Energy Technologies Web Site

ANP QUARTERLY PROGRESS REPORT
phase diagrams are available. The results de-
scribed in Table 6.9 represent one test of each
system at the temperature indicated. The temper-
ature chosen lies in the one-liquid phase region
of the phase diagram - generally about 5OoC
above the two-liquid phase region. As may be
seen, all tests were conducted in the metal-poor
section of the system.
MOLE FRACTION OF SODIUM
UNCLASSIFIED
ORNL-LR-DWG 465:
Fig, 6.19. Relative Reactivity of Sodium-
Bismuth Solutions with Moist Air at 70OoC.
curve represents data for dry air.
The
System
TABLE 6.9. FLAMMABILITY OF ALKALI
METAL-ALKALI HALIDE SYSTEMS
Metal Content Test Temperature Reaction
(mole %) (O C)
Na-NaF 2 1050 Mild
5 1050 Violent
10 1050 Violent
N a-Na CI 2 850 Little
6.6 900 Violent
30 1050 Vi0 I en t
No-Nal 2 700 Mild
5 800 Mi Id
10 900 Vi o I ent
30 1000 Violent
K-K F 2 900 Mild
5 900 Violent
10 900 Violent
98
CHEMICAL STUDIES OF CORROSION
F. Kertesz
Materials Chemistry Division
Effect of Temperature on the Corrosion of
lnconel Melts with NiF, Additions
H. J. Buttram R. E. Meadows
N. V. Smith
Materials Chemistry Division
In order to study specifically the removal of
chromium from lnconel by a known corroding agent
in fluoride melts, additions of NiF, were made
to NaF-ZrF,-UF, (53.5-40.0-6.5 mole %) in lnconel
capsules. These capsules were subjected to
100-hr static tests in the temperature range 600
to looooc.
When the chromium concentration of the melt
after the tests was plotted against the amount of
NiF, added to the melt, a temperature effect at
a relatively high concentration of NiF, (690
meq/kg) was noted. Additions of NiF, up to about
70 meq/kg yielded chromium concentrations which
were independent of temperature to within *lo0
ppm Cr". The mixture to which the large addition
of NiF, (690 meqhg) was made showed, at 600°C,
a chromium content of 280 ppm Crtt that was
considerably below the stoichiometric quantity;
at 800 and 900°C, there were successive increases
to 630 and 840 ppm Cr"; while at 1000°C, 550
ppm Crtt could be found. Metallographic observations
paralleled the chemical analyses. Possible
explanations for the finding of decreased
chromium content at 1000°C were set forth *in a
previous report. 13
Effect of Chromium Additions on the Corrosion of
lnconel in Fluoride Melts with NiF, Additions
H. J. Buttram R. E. Meadows
Materials Chemistry Division
The behavior of lnconel capsules exposed to
NaZrF, and to NaF-ZrF,-UF, (53.5-40.0-6.5
mole %) was studied by using 100-hr tilting-furnace
13H. J. Buttram, R. E. Meadows, and N. V. Smith, ANP
Quar. Prog. Rep. Sept. 10, 1954, ORNL-1771, p 108.
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