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61.
Inhibition of Zinc Dissolution in Borate Sulfate Electrolytes by Benzoimidazoles V. V. Ekilik, V. V. Chernyavina, and G. N. Ekili Department of Chemistry, Rostov State University, ul. Zorge 7, Rostov-on-Don, 344090 Russia E-mail:
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Received March 31, 2006 Abstract — The effects of the concentrations of sodium sulfate, benzoimidazole, and its derivatives on active and passive zinc dissolution and local depassivation were studied. The correlations between the effect of substituted benzoimidazoles and the basicity, polarizability, and hydrophobicity were determined. PACS numbers: 81.65.Kn, 82.30.-b DOI: 10.1134/S003317320703006X
09/09/2008 | 1152 Hits | Print
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62.
The Role of Electrochemical Factors in the Initial Stage of Fatigue-Corrosion Destruction of Stainless Steels V. I. Pokhmursky and M. S. Khoma Karpenko Physicomechanical Institute, National Academy of Sciences of Ukraine, ul. Naukova 5, Lvov, 79601 Ukraine E-mail:
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Received April 13, 2006 Abstract — The corrosion-fatigue destruction of stainless steels of different classes is studied. It is shown that a decrease in their endurance limit in chloride media is determined by their structure, rather than chemical composition and strength. Based on the electrochemical studies of cyclic-deformed steel samples, their additional deformation dissolution during the period of cracks initiation was calculated. An electrochemical criterion of the susceptibility of corrosion-resistant steels to a corrosion fatigue is suggested and its characteristic analytical formula is derived. The criterion is based on the mutual correlation between the metals’ relative deformationdissolution at the strain equal to the fatigue limit on one hand and the degree of decrease in their endurance under the effect of environment on the other. The occurrence of physical limit of the corrosion fatigue for passive metals is demonstrated. A nondestructive method of determining the corrosion fatigue limit of corrosionresistant steels, based on the change in the sign of polarizing current is developed, and accelerates the tests by a factor of 10–15 PACS numbers: 81.65.Kn, 82.20.Wt DOI: 10.1134/S0033173207030071
09/09/2008 | 1197 Hits | Print
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63.
Protection of Systems with Faulty Sealing by Volatile Corrosion Inhibitors N. N. Andreev, N. V. Lavrinova, and N. A. Lebedeva Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences,
Leninskii pr. 31, Moscow, 119991 Russia Received September 7, 2006 Abstract — Processes that initiate corrosion in systems with faulty sealing are analyzed in terms of a mathematical model developed to describe metal protection with volatile inhibitors in such systems. It was demonstrated that the protection times are often determined by the kinetics of dilution of an inhibitor with water coming from the atmosphere. The ways of enhancing the vapor-phase protection are proposed. It is found that the effectiveness of a VCI in incompletely sealed systems can be estimated in accelerated tests by decreasing its dosage and increasing the mass exchange surface since these factors stimulate corrosion without violating the similarity principle. PACS numbers: 81.65.Kn DOI: 10.1134/S0033173207030083
09/09/2008 | 1245 Hits | Print
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64.
Polyfunctional Effects of [1,3]Thiazino[3,2-a]benzoimidazol-4-ones on Steel Corrosion V. N. Chelyabievaa, O. I. Sizayaa, S. V. Gatsenkoa, A. N. Esipenkob, and V. N. Britsunb a Chernigov State Technological University, ul. Shevchenko 95, Chernigov, 14027 Ukraine E-mail:
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b Institute of Organic Chemistry, National Academy of Sciences of Ukraine, ul. Murmanskaya 5, Kiev, 02660 Ukraine E-mail:
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Received February 27, 2006 Abstract — [1,3]Thiazino[3,2-a]benzoimidazol-4-ones were found to be effective inhibitors of the acid corrosion of steel 20 in 1 M HCl and 1 M H2SO4 (pH 0) and valuable polyfunctional additives that enhance the anticorrosion properties and stimulate the formation of an epoxy powder coating. PACS numbers: 81.65.Kn, 82.30.-b
09/09/2008 | 1233 Hits | Print
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65.
Effects of Arylthio- and Arylseleno(methoxy)methanes on Acid Corrosion of CT3 Steel I. N. Chernyad’ev, A. B. Shein, and A. N. Nedugov* Perm State University, ul. Bukireva 15, Perm, 614990 Russia E-mail:
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* Institute of Natural Sciences, Perm, Russia Received November 29, 2005 Abstract — The effects of various arylthio- and arylseleno(methoxy)methanes on corrosion of CT3 steel in sulfuric and hydrochloric acid solutions were studied by gravimetric and voltammetric methods. Some compounds of theses classes were found to be effective inhibitors of the acid corrosion of CT3 steel. The presence of the  X–CH2–O–CH3 groups (X = S or Se) in aromatic amines and their derivatives enhanced their inhibitive properties. However, because these groups are highly hydrophobic, the molecules of inhibitors should contain other fragments that ensure sufficient solubility. PACS numbers: 81.65.Kn, 82.30.-b DOI: 10.1134/S0033173207030101
09/09/2008 | 1195 Hits | Print
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66.
Corrosion Pyrophoric Deposits as Promoters of Self-Ignition of Storage Tanks with Sour Crude Oil Yu. A. Beilina, L. A. Nisel’sonb, I. R. Begishevc, L. I. Filimonova, B. A. Shishkanova,
I. I. Ashcheulovad, A. N. Podobaevd, and I. I. Reformatskayad a ZAO YuKOS EP, Russia b OOO LANKhIT, Russia c Academy of State Fire Service, Emergency Ministry of the Russian Federation,
ul. Borisa Galushkina 4, Moscow, 129366 Russia d Federal State Unitary Enterprise State Scientific Center of the Russian Federation
“Karpov Research Institute of Physical Chemistry,” ul. Vorontsovo pole 10, Moscow, 103064 Russia E-mail:
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,
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Received August 4, 2006 Abstract — The causes of the formation and the conditions for self-ignition of pyrophoric deposits in the vapor zone of tanks during the storage of sour crude oil were considered. It was demonstrated that creation of an oxygen-free atmosphere inside oil storage tanks seems to be the most promising approach to prevention of selfignition and corrosion. This approach was effected in practice by supplying oil tanks with nitrogen from a membrane gas separator. PACS numbers: 81.65.Kn DOI: 10.1134/S0033173207030113
09/09/2008 | 996 Hits | Print
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67.
Growth of Anodic Oxide Layers under Electric Discharge Conditions V. S. Rudnev Institute of Chemistry, Far East Division, Russian Academy of Sciences, pr. Stoletiya Vladivostoka 159,
Vladivostok, 690022 Russia Received March 28, 2006 Abstract — Experimentally observed mechanisms of the formation of oxide structures on metals in electrolytes under electric discharge conditions are described. Processes of the formation of oxide layers generated by an ensemble of independent spark and arc discharges, the formation of films due to nucleation and radial growth of bulk nuclei of the new phase, and the formation of surface structures by propagating discharges are discussed. PACS numbers: 77.22.Gp, 81.15.-z, 81.65.Rv, 82.45.Bb DOI: 10.1134/S0033173207030125
09/09/2008 | 907 Hits | Print
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68.
Peculiarities of Electroplating Tantalum Coatings from Fluoride Melts V. A. Pavlovskii Baikov Institute of Metallurgy and Material Science, Russian Academy of Sciences, Moscow, Russia Received April 13, 2006 Abstract — Electroplating tantalum coatings on molybdenum, copper, and steel is studied. The effects of various factors (the composition of a fluoride bath, its temperature, current density, and the electric charge spent) on the electrocrystallization of the deposit, its roughness, the degree of dendrite formation, current efficiency, and a possibility to plate multilayer coatings and produce tantalum wares by electrotyping are investigated. To compare the characteristics of the coatings, the studies in a standard chloride–fluoride salt system containing potassium fluorotantalate (K2TaF7) were also carried out under similar conditions. PACS numbers: 81.15.-z; 81.15.Pq DOI: 10.1134/S0033173207030137
09/09/2008 | 947 Hits | Print
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69.
Modification of Titanium Surface during Its Chemical Etching in Fluoride-containing Media M. G. Dontsov, A. V. Balmasov, A. A. Balukova, and O. I. Nevskii Ivanovo State University of Chemical Technology, pr. F. Engel’sa 7, Ivanovo, 153000 Russia;
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Received May 14, 2006 Abstract — The effects of solution composition on the electrical and other physical properties of surface films formed during the titanium chemical etching in fluoride-containing media are studied. It is shown that the for-mation of resistive oxide films results in the surface leveling and an increase in its reflectivity. PACS numbers: 81.40.–z DOI: 10.1134/S0033173207030149
09/09/2008 | 965 Hits | Print
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70.
Chromateless Treatment of Zinc-Plated Rolled Metal V. A. Paramonov, A. T. Moroz, N. G. Filatova, and O. A. Kazandzhiyan Bardin Central Research Institute for the Iron and Steel Industry, Vtoraya Baumanskaya ul. 9/23, Moscow, 105005 Russia Received November 14, 2005 Abstract — In the last decade, the production of galvanized rolled metal has been considerably developed. Consumers of such a material are civil engineering, car manufacturing, and other industry branches. This work considers a possibility of replacing the chromating of the zinc-plated rolled metal by the environmentally safe siliconizing (silicification). PACS numbers: 81.65.Rv; 82.45.Bb DOI: 10.1134/S0033173207030150
09/09/2008 | 899 Hits | Print
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