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1.
Statistical Aspect of the Independence Principle of Heterogeneous Reactions Taking into Account the Surface State Yu. V. Alekseev Karpov Institute of Physical Chemistry, ul. Vorontsovo Pole 10, Moscow, 103064 Russia e-mail:
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Received July 12, 2005 Abstract — The independence principle of electrode reactions is shown to be no more than a particular example of the theoretical-probabilistic regularities determined by the statistical nature of a large scope of systems studied by the chemical kinetics. It does not exclude but explains the possible mutual effect of different reactions on each other. In the case of a mass exchange between a structured solid and a solution or a gas, the independence principle should be formulated in terms of the superficial atom positions determined by the number of close neighbors. PACS numbers: 82.45.Qr DOI: 10.1134/S0033173206040011
12/09/2008 | 1407 Hits | Print
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2.
Corrosion of Iron and Iron Silicon Finely Dispersed Systems in Neutral Media. Part III. Fe Si Systems Prepared by Milling in Pure Heptane or with Oleic-Acid A. V. Syugaeva, S. F. Lomaevaa, and S. M. Reshetnikovb a Physicotechnical Institute, Ural Branch, Russian Academy of Sciences,
ul. Kirova 132, Izhevsk, 426000 Russia e-mail:
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b Udmurtia State University, ul. Universitetskaya 1, Izhevsk, 426034 Russia e-mail:
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Received October 17, 2005 Abstract — Corrosion behavior and the surface layer structure are studied for Fe80Si20 powders mechanically milled in heptane, in particular, with 0.3 wt % of oleic acid. In heptane, the powders become enriched with amorphous phase as time passes, which improves the corrosion resistance significantly. In the presence of oleic acid, some small amount of the amorphous phase is formed indeed in the bulk of the particles; however, the powders’ surfaces become covered by an oxide–organic protective film. With an increase in the milling time, in the presence of oleic acid, the Fe–Si alloy is depleted of silicon because of the SiO2 phase segregation, which deteriorates the powders’ corrosion resistance. PACS numbers: 82.45.Yz DOI: 10.1134/S0033173206040023
12/09/2008 | 1321 Hits | Print
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3.
Iron Dissolution in a Sulfate Electrolyte with Benzoimidazole or a Borate Buffer V. V. Ekilik, V. V. Chernyavina, and G. N. Ekilik Rostov State University, ul. Zorge 7, Rostov-on-Don, 344090 Russia e-mail:
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Received April 19, 2005 Abstract — The effects of benzoimidazole and a borate buffer on the anodic dissolution of iron in a sodium sulfate electrolyte were compared under different conditions of voltammetric experiment (forward and reverse scans and cyclic voltammograms). The rotational speed, the electrode arrangement in a cell, pH, the concentrations of additives, and the temperature were also varied. In the presence of benzoimidazole, the active-passive transition peak at more negative potentials disappeared from the anodic voltammograms under certain experimental conditions, in contrast to electrolytes with a borate buffer. Anodic passivation in the presence of benzoimidazole was impeded compared to a borate buffer. PACS numbers: 82.45.Qr DOI: 10.1134/S0033173206040035
12/09/2008 | 1318 Hits | Print
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4.
Nature of the Potential of Nonpolarized Zinc Electrode in Zincate Solutions V. Rezaite and L. Deresh Institute of Chemistry, ul. Goshtauto 9, Vilna, LT-01108 Lithuania e-mail:
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Received May 3, 2005 Abstract — The effect of components of alkaline zincate solution and surface compounds, which form on metal zinc in the alkaline solutions, on the nature of nonpolarized electrode potential (E) is studied. It is proposed to determine the nature of E by taking into account more rigorously the activities of all solution components. It is found that in the zincate solutions, the potential of nonpolarized metal zinc is the potential of Zn/Zn(OH)2 , OH– electrode of the second kind. PACS numbers: 82.45.Fk DOI: 10.1134/S0033173206040047
12/09/2008 | 1273 Hits | Print
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5.
Deposition of Amorphous Phosphate Coatings on Aluminum V. Burokas, A. Martushene, A. Ruchinskene, A. Sudavichyus, and G. Bikul’chyus Institute of Chemistry, ul. A. Goshtauto 9, Vilna, 08018 Lithuania e-mail:
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Received July 12, 2005 Abstract—Amorphous phosphating of aluminum and its alloys    ,  1, and  16 is studied. It is found that uniform coatings are deposited at pH 4.5 at a temperature of 50°C from the solution containing Mo promoting ions. By using the x-ray photoelectron spectroscopy, it is shown that phosphates of aluminum and Mo(IV, V) are the predominant components of phosphate coating. By the “thin layer” method, it is found that, in the near-surface layer, alkalization of solution takes place depending on the initial pH value. The dependence pHdep = pHin  0.3 is linear. Phosphate coatings, which are deposited in the solution pretreated with magnetic field (MF), differ in their properties from the coatings obtained by the conventional procedure. MF can increase or decrease the corrosion resistance of phosphate coating depending on the aluminum alloy. PACS numbers: 82.45.Bb DOI: 10.1134/S0033173206040059
12/09/2008 | 1329 Hits | Print
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6.
Zinc- and Aluminum-Based Protective Coatings Obtained in a Fluidized Bed Yu. A. Balandina, A. S. Kolpakovb, and E. V. Zharkova a G.I. Nosov Magnitogorsk State Technical University b Ural State Technical University—UPI, ul. Mira 19, Ekaterinburg, 620002, Russia e-mail:
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Received March 19, 2005 Abstract — Sherardizing and zinc-aluminizing   3 steel in a fluidized bed are considered. Microhardness, microbrittleness, porosity, and corrosion resistance of zinc coatings are analyzed. PACS numbers: 81.65.Rv/47.55.Lm DOI: 10.1134/S0033173206040060
12/09/2008 | 1355 Hits | Print
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7.
A Correlation between the Inhibition of Acid Corrosion of Iron by a Mixture of Compounds of a Reaction Series and the Polar Properties of Their Substituents V. P. Grigor’eva, V. M. Kravchenkob†, and V. V. Boginskayaa a Rostov State University, ul. Zorge 7, Rostov-on-Don, 344090 Russia e-mail:
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, (863)253-81-59 b Research Institute of Physical and Organic Chemistry,
pr. Stachki 94/3, Rostov-on-Don, 344104 Russia Received July 19, 2005 Abstract — The character of the adsorption isotherm of a mixture of o-hydroxyazomethine derivatives at an iron electrode is insensitive to the total polarity of the substituents in their molecules. The surface coverage of the electrode by adsorbed compounds of this reaction series (RS) does not depend on the number and concentrations of the components of the mixture, provided that their total concentration and the total polarity of the substituents in their molecules are constant. According to the Linear Gibbs Energy Relation, the overall and partial inhibition factors of the acid corrosion of iron in the presence of mixtures of compounds of this RS are determined by the total polarity of their substituents. PACS numbers: 47.55.dk DOI: 10.1134/S0033173206040072
12/09/2008 | 1359 Hits | Print
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8.
Electrodeposition of Metal Molybdenum from Electrolytes Containing Hydrofluoric Acid N. D. Ivanovaa, S. V. Ivanovb, E. I. Boldyreva, and O. A. Stadnika a Vernadskii Institute of General and Inorganic Chemistry, Ukrainian Academy of Sciences,
ul. Borshchagovskaya 210, korp. 33, Kiev-58, 03058 Ukraine e-mail:
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b National Aviation Institute, Kiev, Ukraine Received January 28, 2005 Abstract — The effect of hydrofluoric acid on the cathodic reduction of molybdate ions is studied. It is shown that the mechanism of this process is determined by the acid concentration: in a concentration range below 25g/l the intermediate products of molybdate-ion reduction, namely, black or colored deposits containing molybdenum with the average valence of 3.6–4 are formed on the cathode. For the concentration above 50 g/l, molybdate ions are completely reduced and form at the cathode dense light metallic coatings with a thickness of 3–5 µm and good adhesion to the substrate. The addition of hydrofluoric acid prevents polymerization of molybdate ions. PACS numbers: 81.15.Pq DOI: 10.1134/S0033173206040084
12/09/2008 | 1340 Hits | Print
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9.
Electrodeposition of Bismuth from a Trilon B Sulfosalicylate Bath T. P. Petrova, K. V. Zelenetskaya, I. F. Rakhmatullina, and M. S. Shapnik Kazan State Technological University, ul. Karla Marksa 68, Kazan, 420015 Russia e-mail:
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, Ú. (8432)314041 Received November 17, 2004 Abstract — Bismuth electrodeposition from baths containing bismuth nitrate, trilon B (disodium ethylenedi-aminetetraacetate Na2H2Edta), and sulfosalicylic acid H3SSA was studied with various ratios of the bath com-ponents. Adding H3SSA to the bath made the deposit become semibright and its current efficiency enhance. PACS numbers: 81.15.Pq DOI: 10.1134/S0033173206040096
12/09/2008 | 1265 Hits | Print
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10.
Kinetic Features of Cadmium Electrodeposition in Iodide Water Acetone Electrolytes V. V. Kuznetsov, L. M. Skibina, and R. R. Khalikov Rostov State University, ul. Zorge 7, Rostov-na-Donu, 344090 Russia e-mail:
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Received April 19, 2005 Abstract — The adsorption of I– ions on the cadmium cathode surface is shown to depend on the interaction mechanism between the components of water–acetone mixtures. During a competitive adsorption of anions and organic solvent molecules, this affects the mechanism and the rate of electrodeposition and also the coating quality. PACS numbers: 82.45.Pq DOI: 10.1134/S0033173206040102
12/09/2008 | 1329 Hits | Print
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