Aminethiocarbamide-containing polyelectrolytes as inhibitors of acid corrosion in steel
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AMINETHIOCARBAMIDE-CONTAINING POLYELECTROLYTES AS INHIBITORS OF ACID CORROSION IN STEEL V. A. Dzhafarov,1,2 N. M. Agaev,1 S. S. Alieva,1 and A. A. Nadzhafova1
UDC 620.197.3
We study a new class of organic compounds, namely, polyethylenepolyaminethiocarbamides, hexamethylenediaminethiocarbamides, and their nitrile derivatives, and their application as inhibitors of corrosion in steel placed in a 5N hydrochloric acid. The high efficiency of these compounds is confirmed by the gravimetric and volumetric methods. It is shown that the inhibitors efficiently protect steel against corrosion for 40–60 min. After the indicated period, we observe the intensification of corrosion processes. As the temperature of the ambient medium increases (40–60°C), the efficiency of the action of inhibitors increases as a result of the chemisorptions of molecules of compounds on the steel surface resulting in the formation of protective films. Keywords: corrosion, inhibitor, hydrogenation, adsorption, physicomechanical characteristics of steel.
In the present work, we consider new (recently developed) antimicrobial and radiation-protective compounds exhibiting the properties of cationic polymeric electrolytes in broad ranges of the pH values (see [1–3]). In [4, 5], it is shown that, as a result of the reaction of polyethylenepolyamine (PEPA) with thiocarbamide, the products are formed according to the following scheme:
where R = (CH 2 )n . The formation of fractions (I–III) in the composition of products strongly depends on the temperature of the reaction. In this case, we first observe the condensation of fraction (I) with 100% formation of polyethylenepolyaminethiocarbamide whose content increases as temperature rises from 120 to 150°C. Further, at 160°C, the process of polycondensation accompanied by the formation of an oligomeric homogeneous fraction (I–III) is almost completed in the system. The other fairly important aim of the introduction of nitrile groups in the oli1 2
Institute of Polymeric Materials, Azerbaijan National Academy of Sciences, Sumgait, Azerbaijan. Corresponding author; e-mail: [email protected].
Translated from Fizyko-Khimichna Mekhanika Materialiv, Vol. 46, No. 1, pp. 118–122, January–February, 2010. Original article submitted August 1, 2007. 134
1068-820X/10/4601–0134
© 2010
Springer Science+Business Media, Inc.
AMINETHIOCARBAMIDE-CONTAINING POLYELECTROLYTES AS INHIBITORS OF ACID CORROSION OF STEEL
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gomers is to block a part of active hydrogen atoms in the amine groups [5]. Changing the ratio of the amounts of acrylonitrile (AC) and the product of polycondensation of PEPA or hexamethylenediamine with thiocarbamide, it is possible to realize a partial replacement of the hydrogen atoms of reactive primary amine groups with nitrile groups and obtain nitrile derivatives of the aminethiocarbamide oligomer. The synthesis, structure, and properties of new aminethiocarbamide oligomers are described in detail in [5]. As acid inhibitors, we studied nitrogen- and sulfur-containing oligomeric polyelectrolytes
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