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11.
Composite Polymer-Containing Protective Layers on Titanium S. V. Gnedenkov, S. L. Sinebryukhov, D. V. Mashtalyar, V. S. Egorkin, A. K. Tsvetnikov, and A. N. Minaev Institute of Chemistry, Far Eastern Branch, Russian Academy of Sciences, Vladivostok, Russia e-mail:
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Received March 21, 2007 Abstract — The influence of treating the coatings obtained by plasma electrolytic oxidation (PEO) and various fractions of polytetrafluoroethylene on the state of the surface of formed composite layers has been studied by electrochemical impedance spectroscopy, differential thermal analysis, and thermogravimetry. Differences in the resistance to charge transfer at the oxide heterostructure/electrolyte interface for various composite layers have been found. The obtained data significantly enlarge and complement the possibilities of directly forming protective coatings, including antiscale ones, on the surface of titanium alloys operating in aggressive media at high temperatures. DOI: 10.1134/S0033173208070102
24/11/2008 | 1148 Посещения | Печать
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12.
Exothermal Oxidation of the Bottom of Discharge Channels upon Microarc Oxidation of Aluminum Alloys A. G. Rakoch, Yu. V. Magurova, I. V. Bardin, G. M. El’khag, P. M. Zharinov, and V. L. Kovalev Moscow State Institute of Steel and Alloys (State Technological University), Leninskii pr. 4, Moscow, 117936 Russia e-mail:
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Received September 5, 2007 Abstract — It has been established empirically that microarc coatings, which are produced on the surface of aluminum alloys in electrolytes that contain relatively small concentrations of chemical components (which, after plasma-chemical and thermochemical transformations, form oxides that enter into the coating), contain metalloceramic layers. The latter fact confirms that one of the main mechanisms of the growth of such coatings is the exothermal oxidation of the metallic bottom of the microarc channels leading to the evaporation of metallic components of the alloy and their transfer into the coating or onto its surface. Therefore, the color of coatings at the relatively early stage of the process of microarc oxidation is a function of the phase composition of the bottom of channels of the microarc discharge. DOI: 10.1134/S0033173208070114
24/11/2008 | 1173 Посещения | Печать
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13.
The Influence of the Conditions of Forming on the Characteristics of the Oxide Protective Films on Aluminum V. S. Rudneva, T. P. Yarovayaa, A. E. Lysenkoa, P. M. Nedosorova, and N. E. Dushinab a Chemistry Institute, Far East Division, Russian Academy of Sciences, Vladivostok, Russia b Aircraft Production Association AO Yury Gagarin, Komsomolsk-on-Amur, Russia Received 12 February 2007 Abstract — The results of investigations concerning the oxide films on the alloy AlMnH obtained by the plasma–electrolytic method are represented. How the proportional increasing of components' concentration of aqueous electrolyte and the transition from anodic to alternating–current anode–cathode polarization influence energy inputs to oxide structures generation and their characteristics has been investigated. It is shown that, in the case of PBW method, this approach results in a decreasing of approximately three times the energy input without any sufficient variation of elemental and phase composition of the covers, their thickness, corrosion resistance, wetting by aqua and oils, or porosity. DOI: 10.1134/S0033173208070126
24/11/2008 | 1163 Посещения | Печать
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14.
On the Formation of Magnetite Coatings on Low-Carbon Steel in Ammonium Nitrate Solution* D. B. Vershoka, P. I. Misurkinb, V. A. Timofeevab, A. B. Solov’evab,
Yu. I. Kuznetsova, and S. F. Timashevc a Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Moscow b Semenov Institute of Physical Chemistry, Russian Academy of Sciences, Moscow c Karpov Scientific Research Physicochemical Institute, Moscow e-mail:
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Received May 30, 2007 Abstract — Initial stages of the formation of magnetite coating (MC) on low-carbon steel in ammonium nitrate solution at a temperature of 98°C is studied by atomic force microscopy. Analyzing the results obtained by flicker–noise spectroscopy allows the degree of continuity and structuring of MC to be estimated. It is shown that the formation of magnetite nuclei in the course of direct electrochemical reaction may take place in the first minutes of oxidation; continuous coating is formed in10–15 min. DOI: 10.1134/S0033173208070138
24/11/2008 | 1153 Посещения | Печать
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15.
Study of Protective Properties of Polymeric Coatings for Portable Solarcell Arrays of the BSA R Type in Tropical Climate Conditions A. A. Polisana, I. S. Persitsb, V. N. Ivoninb, Chin’ Kuok Kkhan’b, and V. A. Karpovc a Sovlaks Company, Moscow b Russian–Vietnamese Tropical Research and Technology Center, Hanoi (Vietnam) c Severtsov Institute of Ecology and Evolution, Russian Academy of Sciences, Moscow e-mail: wtc–
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Received December 15, 2006 Abstract — The influence of factors of the tropical climate of Vietnam on a variation of functional properties of polymeric coatings for portable solarcell arrays has been studied by 12- month-long tests on the base of the Russian-Vietnamese Tropical Research and Technology Center. As a whole, full-scale environmental tests have shown that the new modifications of film materials proposed for face and rear protective coatings are superior in climatic resistance characteristics and parameter stability to the materials applied for these purposes earlier. The adhesive film Radeva–2AM and the film BSP are recommended for application in moist, tropical climates. DOI: 10.1134/S003317320807014X
24/11/2008 | 1088 Посещения | Печать
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16.
Corrosion of Aluminum and its Alloys under the Effect of Microscopic Fungi D. V. Belova, T. N. Sokolovaa, V. F. Smirnovb, O. V. Kuzinaa, L. V. Kostyukovab and V. R. Kartashova a Alexeyev State Technical University, Nizhni Novgorod, Russia b Scientific Research Institute of Chemistry at the Lobachevsky State University, Nizhny Novgorod, Russia e-mail:
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;
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Received May 10, 2007 Abstract — Biocorrosion of aluminum and its alloys under the effect of 8 strains of microscopic fungi has been studied. The most active biodegraders of metals have been revealed. A role of exometabolites formed in the process of microscopic fungi life cycle in the initiation and development of corrosion has been shown. DOI: 10.1134/S0033173208070151
24/11/2008 | 1057 Посещения | Печать
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17.
A Method for Determining Safe Concentrations of Chloride Ions in Pitting Corrosion of Steels in Nitrate Media V. P. Razygraev*, M. V. Lebedeva, and I. I. Korchak Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Moscow, 119991 Russia *e-mail:
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Received April 17, 2007 Abstract — Features of how pitting corrosion develops on steels in nitrate–chloride media are analyzed, and the disadvantages of certain well-known electrochemical methods used to determine safe ratios of components under such conditions are found. A principally new approach to determining these parameters is proposed, based on the induction of intense pitting in definitely aggressive media with subsequent suppression of this process by continuously dilution of the solution or by gradual addition of an inhibitor. Equations are obtained for determining safe component concentrations depending on the volume of solution passing through the cell. Using the proposed method, safe ratios of components are determined for 12Kh18N10T chromium–nickel steel at chloride ion concentrations within 0.02–2.0 M. DOI: 10.1134/S0033173208070163
24/11/2008 | 1153 Посещения | Печать
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18.
A Practical Application of Thermal Desorption Mass Spectrometry for Studying Inhibitors and Corrosion Products A. K. Buryak, T. M. Serdyuk, and A. V. Ul’yanov Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences,
Leninskii pr. 31, Moscow, 119991 Russia e-mail:
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Received November 6, 2007 Abstract — In the present review, examples of the practicality of applying thermal desorption mass spectrometry (TDMS) to study inhibitors and corrosion products are given. It is shown that the highly informative aspect of the method allows regularities of the processes occurring in volume, on surfaces, and in near-surface layers of steels and alloys to be established. The TDMS method makes it possible to identify adsorbed and chemisorbed inhibitors and corrosion products, as well as products of their destruction. DOI: 10.1134/S0033173208070175
24/11/2008 | 1663 Посещения | Печать
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