Russian Journal of Applied Chemistry, 2011, Vol. 84, No. 11, pp. 2013−2014.
Pleiades Publishing, Ltd., 2011.
Original Russian Text © R.I. Yurchenko, A.V. Dolina, A.G. Yurchenko, 2011, published in Zhurnal Prikladnoi Khimii, 2011, Vol. 84, No. 11, pp. 1928−1929.
Intermolecular Synergy Effect on the Inhibiting Action
of N-Phenacylmethylquinolinium Halides
R. I. Yurchenko, A. V. Dolina, and A. G. Yurchenko
National Engineering University of Ukraine “Kiev Polytechnic Ivnstitute,” Kiev, Ukraine
Received May 6, 2010
Abstract—The intermolecular synergy effect of N-phenacylmethylquinolinium halides on the corrosion of steel
in 3 M H
solutions was studied.
As it is known , strengthening of protective action
of organic inhibitors can be reached by two ways, either
by the inclusion of functional groups in an inhibitor mol-
ecule, which favors the inhibitor adsorption on a metal
surface a;nd thus promotes its more effective protection,
or by the use of its compositions with other materials,
which supplement the action of the main inhibitor increas-
ing the degree of ﬁ lling a metal surface.
It has been shown earlier [2, 3] that the both these
methods can be successfully used to increase activity of
N-phenacylmethylpyridinium halides. The study of the
quinolinium analogs of these compounds  has shown
that N-phenacylmethyl-2-R-quinolinium bromides are
restrictedly soluble in 3 M H
solutions. Therefore in
the present we have studied a possibility of strengthen-
ing anticorrosive activity of compound 1, and also of its
iodide analog, compound 2, by means of additives caus-
ing a synergy effect for N-phenacylmethylpyridinium
X = Br (1), I (2).
Inorganic salts: potassium chloride, bromide, or iodide
and also organic substances, urotropin and paraform,
which are often used to raise protective properties of many
known industrial inhibitors, were used as such additives.
To estimate anticorrosive action of compounds under
study, we have determined inhibition coefﬁ cients γ and
degrees of corrosion protection Z of 08 KP steel in the
presence of 1 × 10
of inhibitors in 3 M solutions
of sulfuric acid at 20, 70, and 90°С. Corrosion tests were
fulﬁ lled by a gravimetric method, using steel samples with
a working surface area of 9 × 10
. Duration of tests
was (h): 24 at 20°С, 2 at 70°С, and 1 at 90°С.
The results obtained (see the table) have shown that
at room temperature anticorrosive activity of compound
1 and compositions on its basis reaches a higher level
than in the case of 1-phenacetylmethyl-2-R-quinolinium
bromides studied in . Corrosion inhibition coefﬁ cients
vary within the limits of 31.33–66.27, the degree of pro-
tection of steel surface is 96.81–98.49%, and the same
values for iodide 2 are 32.47–56.80 and 96.92–98.24%,
respectively. It is necessary to note that in the case of salts
1 and 2, in contrast to corresponding pyridinium halides,
the intermolecular synergy effect is observed when not
only organic components, urotropin and paraform, are
used, but also all inorganic components. As it should
be expected, at 70°С the level of protective action of
compounds 1 and 2 and of compositions on their basis is
essentially higher. For bromide 1 and all compositions it