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1.
New Corrosion-Resistant Electrodes: Synthetic Diamond and Diamond-Based Materials. The Semiconductor and Structure Aspects a Review Yu. V. Pleskov Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences,
Leninskii pr. 31, Moscow, 119991 Russia e-mail:
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Received August 6, 2005 Abstract — Specific features of electrode behavior of synthetic diamond and diamond-based materials (in particular, diamond–nondiamond carbon nanocomposites, nanocrystalline diamond, and diamond-like carbon) are reviewed. Effects of the crystal structure and semiconductor nature of diamond on its electrochemical properties are discussed.
18/09/2008 | 1292 Hits | Print
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2.
Structure and Chemical and Phase Composition of the Thermal Oxidation Products of Ni Mo B Coatings Plated by Chemical Catalytic Reduction V. A. Arslambekov, A. B. Drovosekov, M. V. Ivanov, V. M. Krutskikh, E. N. Lubnin, and Yu. M. Polukarov Institute of Physical Chemistry, Russian Academy of Sciences, Leninskii pr. 31, Moscow, 119991 Russia e-mail:
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Received July 4, 2005 Abstract — Morphology, phase composition, and chemical state of the elements in the superficial oxide layers on Ni–Mo–B alloy coatings obtained by chemical catalytic reduction of metal ions with dimethylamine borane are studied. The coatings were oxidized at 600°C and an air pressure of 2  104 Pa. The difference in the growth morphology of the oxide layers on freshly deposited coatings and those preliminarily heated in a vacuum is revealed. The oxide films are composed of the MoO2 , Mo2C, as well as amorphous and nanocrystalline NiO, phases. Electron Auger spectroscopy has shown that boron in the form of B(OH)3 is present in segregations along spheroid boundaries. Upon the oxidation of freshly deposited coatings, pits are formed as a result of the “explosive” removal of water vapors from the coating.
18/09/2008 | 1196 Hits | Print
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3.
Dissolution Kinetics of Hydrogenated Iron in Acidic Chloride Electrolyte A. I. Marshakov and T. A. Nenasheva Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences,
Leninskii pr. 31, Moscow, 119991 Russia e-mail:
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Received December 23, 2004 Abstract — The rate constants of the discharge of H+ ions and the molization of adsorbed H atoms and the constant of hydrogen exchange between the surface and bulk of iron in acidic chloride electrolytes were determined. The effect of sorbed hydrogen on the kinetics of iron dissolution was studied with the use of a bipolar membrane electrode.
18/09/2008 | 1268 Hits | Print
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4.
The Effect of Phosphonates on the Corrosion of Carbon Steel in Heat-Supply Water Yu. V. Balaban-Irmenin, A. M. Rubashov, and N. G. Fokina All-Russian Heat-Power Engineering Institute (OAO VTI), Moscow, Russia e-mail:
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Received August 19, 2004 Abstract — The effect of phosphonates used in Russian heat-power engineering on the corrosion of carbon steel in deaerated delivery water at 90°C is studied. It is shown that introduction of phosphonates reduces the susceptibility of steel to local corrosion. A zinc complex of hydroxyethylidenediphosphonic acid (OEDP–zinc) is the most effective inhibitor of the anodic reaction.
18/09/2008 | 1282 Hits | Print
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5.
Boron Based Complex Wear-Resistant Coatings Yu. A. Balandin Magnitogorsk State Technical University, pr. Lenina 38, Magnitogorsk, 455000 Russia e-mail:
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Received October 27, 2004 Abstract — Applying boron, boron–copper, and boron–nickel diffusion coatings to die steels, as well as the microhardness, microbrittleness and wear resistance of the steels with the coatings are considered.
18/09/2008 | 1317 Hits | Print
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6.
The Dissolution of Silver Cathodically Polarized in Acid Chloride Media L. E. Volkova, I. K. Marshakov, N. M. Tutukina, and I. V. Kreiser Voronezh State University, Universitetskaya pl. 1, Voronezh, 394006 Russia e-mail:
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Received October 1, 2004 Abstract — The dissolution of silver cathodically polarized in a 1M HCl solution is investigated. It occurs only in the presence of oxygen, is independent of the cathodic potential in a range from 0.00 to –0.45 V, and is determined by the convective experimental conditions and the acidity of the solution. It may be assumed that silver can be oxidized at cathodic potentials because of an increase in the concentration of hydroxide ions adsorbed by the electrode, during the reduction of the dissolved oxygen.
18/09/2008 | 1361 Hits | Print
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7.
Interrelation between Partial Reactions during Alternating-Current Polarization of Copper in Chloride Environments O. Yu. Kuksina, V. Yu. Kondrashin, and I. K. Marshakov Voronezh State University, Universitetskaya pl. 1, Voronezh, 394006 Russia e-mail:
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Received October 1, 2004 Abstract — Infralow-frequency alternating-current polarization of a copper electrode in chloride environments causes an increase in the pH of a near-electrode layer, as well as the concentration of hydroxide ions adsorbed at the electrode, during the cathodic half-period. This facilitates the oxidation of copper during the subsequent anodic half-period and changes the character of the oxidation products, that is, instead of soluble, insoluble compounds form. During the anodic half-period, consumption of hydroxide ions restores the initial pH in a near-electrode layer. The oxidation products of copper may become soluble again.
18/09/2008 | 1341 Hits | Print
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8.
Kinetics of the Cu2O Chemical Decomposition during the Copper Electrochemical Oxidation in the Sulfuric-Acid-Based Electrolyte Systems A. V. Noskov, E. P. Grishina, and A. M. Pimenova Institute of Solutions Chemistry, Russian Academy of Sciences,
ul. Akademicheskaya 1, Ivanovo, 153045 Russia e-mail:
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Received May 23, 2005 Abstract — Electrochemical copper oxidation in sulfuric acid aqueous solutions and sulfate electrolytes thickened with the silicon-dioxide powder is studied potentiodynamically. Based on the current theoretical concepts, the polarization-rate dependences of the anodic current density maximum is analyzed. It is shown that these dependences can be adequately described using a porous-layer resistance model that takes into account chemical decomposition of the passivating Cu2O film formed via electrochemical mechanism. The film decomposi-tion rate constants are calculated for the studied electrolytic systems at different temperatures.
18/09/2008 | 1384 Hits | Print
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9.
Electroplating Kinetics of a Nickel Tungsten Alloy V. L. Kotov and M. V. Shmukler Ivanovo State Chemical-Technological University, pr. Engelsa 7, Ivanovo, 153460 Russia e-mail:
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Received March 17, 2004 Abstract — Electroplating a nickel–tungsten alloy under various electrolysis conditions (direct and alternating current) is studied. A radical–film mechanism of the alloy formation by the cathodic deposition is experimentally proved. The effect of sorption processes at the film–electrolyte boundary on the alloy formation, as well as the possibility of controlling the film composition and structure by changing the electric field intensity, is studied. Deposits with a content of the high-melting component of up to 61% are obtained.
18/09/2008 | 1296 Hits | Print
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10.
Model Concepts on the Mechanism of Microarc Oxidation of Metal Materials and the Control over This Process A. G. Rakoch, V. V. Khokhlov, V. A. Bautin, N. A. Lebedeva, Yu. V. Magurova, and I. V. Bardin Moscow State Institute of Steel and Alloys (Technological University), Leninskii pr. 4, Moscow, 119991 Russia e-mail:
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,
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Received July 16, 2005 Abstract — Based on a critical analysis of literature data, new model concepts on the mechanism of microarc oxidation (MAO) are developed. The correctness of these model concepts is confirmed by experimental results on the average growth rate of oxide-ceramic coatings for different duration of the MAO process on   31,   2 1, and    5 alloys, the morphology of the surface structure of coatings of different thickness, the comparative electrical strength of dielectric coatings, which is assessed during self-quenching of the MAO process and in air. Equivalent electric circuits developed describe this process and are experimentally shown to be the “tool” which allows controlling MAO of aluminum and magnesium alloys.
18/09/2008 | 1300 Hits | Print
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