CORROSION RESISTANCE OF TITANIUM-CHROMIUM DIBORIDE
AND COMPOSITE MATERIAL BASED ON IT
V. P. Konoval
Translated from Novye Ogneupory, No. 10, pp. 35 – 38, October 2010.
Original article submitted April 6, 2010.
The resistance to electrochemical corrosion and high-temperature oxidation of titanium-chromium diboride
and materials with a metal binder based upon it is studied. The mechanism of processes that occur in com
pacted specimens and powders is studied, and the composition of reaction products in relation to specimen
heating temperature is determined. It is established that the oxide films that form at a specimen surface during
oxidation are protective and prevent further material oxidation.
Keywords: high-temperature oxidation, electrochemical corrosion, titanium-chromium diboride, composite
The expediency of ceramic and cermet materials in vari-
ous technology is due to their high heat resistance and
high-temperature strength in air, corrosion resistance in elec-
trolytes, hardness and wear resistance. Among the consider-
able number of ceramic materials there is special interest in
refractory compounds of titanium: TiC, TiB
, TiN, TiCN,
. The advantage of these ceramic materials is
the high hardness, wear- and corrosion-resistance, high den-
sity, good electrical conductivity (for this class of materials),
and also presence within CIS countries of a rich raw material
base for their manufacture.
Among the materials listed the greatest interest with re
spect to properties is titanium-chromium diboride TiCrB
. In the majority of work devoted to this material, the
mechanism of its contact reaction with metal alloys has been
studied [2, 3], mechanical and tribotechnical properties have
been determined [4, 5], both in pure form, and also with a
metal binder, and the possibilities for deposition and surfac
ing have been determined [6, 7].
A promising area for using titanium-chromium diboride,
composite materials and coatings based on it, is use in corro
sive media (chemical industry) and at high temperature. With
the aim of determining life under these conditions for tita
nium-chromium diboride and composite material developed
on its basis, the corrosion resistance of these materials in 3%
NaCl solution and their resistance to high-temperature oxida
tion were studied.
EXPERIMENTAL PROCEDURE AND MATERIALS
Electrochemical corrosion was studied at 20°C in a me-
dium of 3% NaCl solution (sea water) in an electrochemical
cell with an anode of the test material and a platinum cathode
by a potentiodynamic method of polarization curves using
PI50 – 1 and P5848 potentiostats. The electrolyte composi-
tion after electrolysis was studied by chemical analysis.
The corrosion resistance at high temperature was evalu
ated by differential thermal analysis (DTA). DTA-curves
with T-curves (temperature) and thermogravimetric TG-
curves were recorded in a derivatograph type Q-1500 (rate of
temperature increases 10°C/min) in the range 20 – 1000°C at
atmospheric air pressure. The sensitivity selected in the re
cords was: DTA — 1/10; DTG — 1/10; TG — 2.0 × 10
The standard sued for DTA measurements was freshly cal
. The weight of test material samples was
In order to determine the composition of oxidation prod
ucts at different specimen temperatures a corresponding ma
terial was subjected to isothermal heating in air up to a maxi
mum temperature corresponding to the thermal effect during
2 h. Oxidation production of a test material were studied by
X-ray phase analysis in a DRON-2.5 diffractometer.
The objects for study used were specimens of refractory
compounds were TiB
, and composite material with
a metal binder TKhBF-30 (TiCrB
specimens were prepared by hot compaction, and the corre
sponding powders were prepared by grinding sintered speci
mens followed by screening. Plating of powders with alloy
Refractories and Industrial Ceramics Vol. 51, No. 5, January, 2011
1083-4877/11/5105-0370 © 2011 Springer Science+Business Media, Inc.
I. N. Frantsevich Institute of Materials Science Problems,
Ukraine National Academy of Sciences, Kiev, Ukraine.