ORNL-2106 - the Molten Salt Energy Technologies Web Site

PERIOD ENDlNG JUNE 10, 1956
V which is’defined by the equation chromium compound in solution is trivalent. The
net reaction is (approximately)
8 and
-W
where Cli) represents the equilibrium concentration
of the designated component in mole fraction, can
be evaluated for pure chromium and has been shown
to be constant at a given temperature.
For cases in which the GF, and UF, present
are formed only by the reaction described above,
and
If the amount of UF, added initially is always the
same and if the fraction of this UF, reduced to
UF, is small, then
and
if all other factors
librium concentrations to be expected from Inconel.
The corrosion reaction for the NaF*KF-LiF-UF,
mixtures is considerably more complex. In this
nsecuti ve reaction
No F-K F-L I F
As a result of these reactions about 80% of the
No F -K F-L IF
14UF4 + 5Cr ,-! 4CrF, + GF, + 14UF,
If CrF,, CrF,, and UF, all arise solely from this
reaction and if C is constant, then
(UF4)
‘(CrF3) * 4c(CrF2) ’
‘(“3) = 14c(CrF2) f
Accordingly, with all other variables held constant,
the concentration of CrF, + GF, is a function of
the 5/19 power of th le fraction of chromium in
the alloy, Therefore, from equilibrium dota for
pl i coted eq uo ti on
or
the GF3 concentration varies as (G)’l4.
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