41.
Corrosion Degradation of Chromium Coatings on Steel in NaCl Concentrated Solution I. V. Petukhova, M. G. Shcherban’a, V. I. Kichigina, A. V. Zaitsevaa, E. V. Mikhailovb, and S. V. Zavodchikovc a Perm’ State University, ul. Bukireva 15, Perm’, 614990 Russia e-mail:
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b Institute of Continuous Media Mechanics, Ural Branch, Russian Academy of Sciences, ul. Akademika Koroleva 1, Perm’, 614061 Russia c Perm’ Branch of All-Russian Research Institute of Drilling Equipment, ul. Karpinskogo 24, Perm’, 614000 Russia Received August 2, 2004 Abstract — Corrosion-electrochemical behavior of chromium coatings at steel substrates (40, 2013, and 121810) in concentrated (318 g/l) NaCl solution at elevated temperatures is studied, in particular, under conditions of friction against rubber (thus modeling the mine screw-driller rotor operation conditions). By and large, the chromium coatings in the studied solution have fairly good corrosion stability. However, when through pores occur in the coatings, chromium–steel galvanic couples are formed, in which chromium is the anode, and steel, the cathode. This causes intense corrosion damage to the coating in close proximity to the pores. Steel undergoes no corrosion here. It is the Cr-coating porosity that gives rise to its accelerated degradation under the friction, although friction as such does not accelerate the corrosion catastrophically. PACS numbers: 82.45.Bb DOI: 10.1134/S0033173206040126
12/09/2008 | 1122 Посещения | Печать
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42.
The Kinetics of Phosphate Film Formation on the Type MA 21 MagnesiumLithium Alloys L. A. Isaicheva, N. M. Trepak, L. K. Il’ina, and A. L. L’vov Saratov State University, ul. Universitetskaya 42, Saratov, 410601 Russia e-mail:
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Received June 8, 2005 Abstract — Kinetics of phosphating MA 21 magnesium–lithium alloys in a zinc–nitrate–phosphate solution (0.25 Zn2+ + 0.34 + 0.17 N + 0.02 F, pH = 2.7) at 25°C is studied with various surface preparation procedures. The effect of the alloy surface pretreatment in titanium-containing activating solutions on the electrochemical process rate and the initial stage of the phosphate film crystallization is revealed. Peculiarities of the phosphate film growth during different stages of the magnesium–lithium alloy phosphating are elu-cidated. Combining the activating pretreatment with zinc–phosphate bath allows accelerated applying finegrain thin phosphate conversion layers with enhanced protective effect on magnesium–lithium alloys. PACS numbers: 81.65.Rv DOI: 10.1134/S0033173206040138
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43.
Electrochemical Production of Ultradisperse Copper-Containing Particles from Organo-Aqueous Electrolyte Solutions S. A. Chulovskayaa, A. V. Balmasovb, S. A. Lilina, b, and V. I. Parfenyuka, b a Institute of Chemistry of Solutions, Russian Academy of Sciences, ul. Akademicheskaya 1, Ivanovo, 153045 Russia e-mail:
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b Ivanovo State University of Chemical Technology, pr. Engelsa 7, Ivanovo, 153460 Russia Received October 20, 2005 Abstract — A possibility of the cathodic deposition of copper-containing nanopowders from organo-aqueous electrolyte solutions is studied. The dimension of particles is corroborated with a transmission electron microscope. Additions of low-molecular surfactants to aqueous electrolyte solutions lead to a decrease in the limiting cathodic currents thus promoting the formation of finely dispersed powder. PACS numbers: 81.16.c/82.45.Yz DOI: 10.1134/S003317320604014X
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44.
Immersion Potential R. R. Salem The Higher Chemical College, Moscow, Russia e-mail:
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Received November 30, 2004 Abstract — A novel interpretation of the nature of Billiter’s potential is proposed. DOI: 10.1134/S0033173206040151
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45.
Investigation of the Oxidation Kinetics of Steel during Its Preliminary Roasting before Enameling O. R. Lazutkinaa , P. I. Bulerb , A. K. Kazakc , and N. B. Mullagalievaa a VPO Ural State Technical University–Ural Polytechnical Institute, ul. Mira 19, Yekaterinburg, 620002 Russia e-mail:
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b Erlangen University, Nurenberg, D-81058 Erlangen Martenstrasse 5, Deutschland c State Scientific Center, OAO Ural Institute of Metals, ul. Gagarina 14, Yekaterinburg, 620062 Russia Received January 28, 2005 Abstract — The oxidation kinetic peculiarities of traditional and prospective steels utilized in manufacturing hot-rolled enameled pipes are considered. The oxidation conditions, as well as its limiting stages, in a temperature range of 500–900°C, are determined. The x-ray diffraction analysis was applied to determine the composition of the scale formed. Ways of selecting the optimum temperature–time conditions of roasting the metal before its enameling are recommended. DOI: 10.1134/S0033173206040163
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46.
Modeling of Linear Correlation in Stray Current Circuits A. M. Kerimov, P. A. Spirin, and R. A. Kerimov Azerbaidzhan State Oil Academy, ul. D. Alievoi 235/9, Baku, AZ-1010 Azerbaidzhan Received April 23, 2005 DOI: 10.1134/S0033173206040175
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47.
Relationship between the Parameters of Stray Current Circuits and the Traction Load A. M. Kerimov, P. A. Spirin, and R. A. Kerimov Azerbaidzhan State Oil Academy, ul. D. Alievoi 235/9, Baku, AZ-1010 Azerbaidzhan Received April 24, 2005 DOI: 10.1134/S0033173206040187
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48.
The Aftereffect of Cyclic Loading on the Corrosion of Aluminum-Based Alloys V. Yu. Vasil’eva, V. S. Shapkinb, N. V. Barulenkovaa, M. V. Antonovab, and E. N. Antonovaa a Moscow Institute of Steel and Alloys, Leninskii pr. 4, Moscow, 119991 Russia e-mail:
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b State Research Institute of Civil Aviation, Moscow, Russia Received June 25, 2005 Abstract — Effects of bench loading and stresses on the corrosion resistance of 16 alloy are studied. Complicated effect of the stress intensity and the cyclic loading on the surface morphology and pit concentration is demonstrated. Harmonic character of the loading dependence of the change of corrosion resistance is due to segregation effects. DOI: 10.1134/S0033173206030015
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49.
On Inhibition of Hydrogen-Sulfide Corrosion of Steels with Quaternary Ammonium Salts Yu. I. Kuznetsov, L. V. Frolova, and E. V. Tomina Institute of Physical Chemistry, Russian Academy of Sciences, Leninskii pr. 31, Moscow, 119991 Russia e-mail:
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Received August 7, 2005 Abstract — The corrosion and electrochemical behavior of carbon steels in standard 0.5% chloride electrolytes acidified with CH3COOH and saturated with H2S was studied. The possibility of protecting steels with quaternary ammonium salts (QASs) obtained by reactions of secondary and tertiary amines with benzyl chloride was investigated. It was found that the protective properties of QASs depend on their chemical structures and can be expressed, to a first approximation, in terms of the Linear Gibbs Energy Relation with the use of the hydrophobic f constants and Taft *-constants of the substituents. The presence of hydrophobic and electron-accepting substituents was found to enhance the protective properties of the inhibitors. DOI: 10.1134/S0033173206030027
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50.
A New Theoretical Approach to the Thermodynamic Calculation of High-Temperature Oxidation of NiCr Alloys Yu. Ya. Andreev and A. A. Shumkin Moscow State Institute of Steel and Alloys, Leninskii pr. 4, Moscow, 117936 Russia e-mail:
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Received April 12, 2005 Abstract — In calculations, not only the Gibbs formation energy of nickel and chromium oxides and thermodynamic activities of the alloy components, but also the Gibbs surface energy of a Ni–Cr alloy is taken into account. The method is based on the adsorption model of the alloy oxidation, according to which the adsorption of an alloy component with the smaller surface energy, namely, nickel, at the alloy–oxide film interface bound-ary shifts the dynamic equilibrium between the alloy and oxide-film components toward the formation of NiO. For the oxidation of Ni–Cr alloys, which are solid solutions with an fcc lattice, at 1123 to 1473 K, concentration boundaries of the chromium content in the alloy are calculated for the case of the prevailing formation of Cr2O3 oxide, which determines the high heat resistance of Ni–Cr alloys. DOI: 10.1134/S0033173206030039
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