Russian Journal of Applied Chemistry, 2011, Vol. 84, No. 9, pp. 1529−1531.
Pleiades Publishing, Ltd., 2011.
Original Russian Text © I.I. Ivanov, O.A. Dubovikov, L.V. Grigor’eva, A.A. Kuzhaeva, P.V. Zgonnik, 2011, published in Zhurnal Prikladnoi Khimii, 2011,
Vol. 84, No. 9, pp. 1478−1481.
AND CORROSION PROTECTION OF METALS
Study of Stability of Constructional Materials
in Melts Containing Lower Titanium Chlorides
I. I. Ivanov, O. A. Dubovikov, L. V. Grigor’eva, A. A. Kuzhaeva, and P. V. Zgonnik
St. Petersburg State Mining Institute (Engineering University), St. Petersburg, Russia
Received April 22, 2011
Abstract—Corrosion resistance of some metals (Steel 3, 1Kh18N9T, EI-868, and pure Ti, Ni, and Mo) in solutions
containing lower titanium chlorides was studied. Data on relative corrosion resistance of the speciﬁ ed materials
in salt media were obtained.
The problem of stability of steels and metals in melts
containing titanium chlorides is of a considerable interest,
especially for obtaining high-purity titanium. It was found
in  that the corrosion rate of steels is predominantly
deﬁ ned by the composition of a medium: the most ac-
tive component is titanium(IV) chloride and after that
titanium(III) chloride. A high content of titanium(II)
chloride in a melt leads to its disproportionation on a steel
surface and to the formation of metallic and intermetallic
coats. It was shown by comparing various types of steel
(Steel 3, 1Kh18N9T, 2Kh13) that Steel 3 is more resistant
in melts containing titanium(III) chloride than other types,
which are susceptible to chromium dissolution. As applied
to pure metals, the authors have found a decrease in the
corrosion resistance along the series Ni, Mo, Cr, V, Mn.
It was noted  that metal corrosion in a fused chloride is
basically of the electrochemical nature and the selective
dissolution of some components of metal alloys can be
explained by a difference of electrochemical potentials of
these elements. The effects of temperature and reduction
process duration, and also of the titanium(III) chloride
contents in melts on corrosion of steels was reported in
the Aleksandrov’s work . A decrease in the relative
content of titanium dichloride strengthens corrosion of
All the speciﬁ ed studies of corrosion resistance of
materials were carried out under static conditions when,
as is known, diffusion processes play the key role. As
melts are intensively interfused while their metallother-
mic production and reﬁ ning, it seemed necessary to clear
up the effect of this factor on the corrosion resistance of
Corrosion of constructional materials in melts under
intermixing conditions was studied at 800°C and the
intensity of shaking an ampoule of 240 oscillations per
minute at the exposure time of 30 min using the procedure
and the installation described in .
As it is seen from the obtained data (Table 1), the most
aggressive component of the used melts is titanium(III)
chloride: the melt of sodium chloride and titanium tri-
chloride renders a signiﬁ cant corrosive attack on all the
studied materials, except for molybdenum and nickel.
It follows from Fig. 1 that, despite of essential differ-
ence in disruption rates of titanium and Steel 3, corrosion
Fig. 1. Corrosion K (g m
) of (1) VT-I and (2) Steel 3 in a melt
containing titanium trichloride.
K × 10