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41.
Influence of the Composition of the Liquid Phase and the Concentration of Benzohydrazide on Its Effectiveness during Cadmium Electrodeposition from Water Acetone Perchlorate Electrolytes V. V. Kuznetsov, L. M. Skibina, and R. R. Khalikov
Сохранить Department of Chemistry, Southern Federal University, ul. Zorge 7, Rostov-on-Don, 344090 Russia E-mail:
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Received May 3, 2007 Abstract — Cadmium–benzohydrazide complexes (2 : 1) were found to be the main electroactive species in cadmium electrodeposition from water–acetone perchlorate baths. The discharge of these complexes is preceded by their dissociation at the cathode (zone of water structure stabilization) or in the bulk of the solution (zone of acetone structure stabilization). In the microheterogeneity zone of the mixed solvent, the complexes can be reduced from the adsorbed state. The process is best inhibited at low concentrations of benzohydrazide ( = 10 4 mol/l), when the electrode is covered with a very dense layer of adsorbed benzohydrazide and acetone molecules. With an increase in  , perchlorate anions become more adsorbable, which is accompanied by increasing facilitation of the discharge reaction ( '-effect). The strongest depolarizing effect of Cl anions is observed in the zone of acetone structure stabilization, which is due to selective solvation of the anion and the desalting effect of the mixed solvent. PACS numbers: 82.45.-Qr DOI: 10.1134/S2070205109030034
22/06/2009 | 1200 Hits | Print
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42.
Comparative Analysis of the Adsorption of the Stereoisomers of Hydroxy- and Dihydroxyproline at Graphitized Thermal Soot E. S. Kuznetsova, A. V. Ul’yanov, and A. K. Buryak Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences,
Leninskii pr. 31, Moscow, 119991 Russia E-mail:
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Received June 5, 2008 Abstract — The thermodynamic characteristics of the adsorption of proline and its derivatives at graphitized thermal soot (GTS) were determined. It was found that the arrangement of the hydroxy groups in the amino acid molecule influences its adsorption at GTS. The thermodynamic characteristics of the adsorption of the stereoisomers of hydroxy- and dihydroxyproline at GTS were calculated. The influence of the internal rotation angles in the molecules of proline and its derivatives on their adsorption at GTS was studied. PACS number: 68.43.De DOI: 10.1134/S2070205109030046
22/06/2009 | 1163 Hits | Print
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43.
Determination of the Flory - Huggins Parameter for a Pair of Polymer Units from AFM Data for Thin Filmsof Block Copolymers E. A. Men’shikov1,2, A. V. Bol’shakova2, and I. V. Yaminskii2 1 Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Leninskii pr. 31, Moscow,
119991 Russia 2 Faculty of Physics, Moscow State University, Moscow, 119992 Russia E-mail:
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Received March 6, 2008 Abstract — The structures of thin films of the polystyrene–polybutadiene–polystyrene (SBS) and polystyrene–poly(methyl acrylate)–polystyrene (SMAS) triblock copolymers were studied. The film morphology was found to depend on the conditions of film formation. The average domain sizes of these films and the period of the lamellar structure of SMAS films were determined. The Flory–Huggins parameter was estimated for a pair of styrene and methyl acrylate units. PACS numbers: 87.64.Dz DOI: 10.1134/S2070205109030058
22/06/2009 | 1166 Hits | Print
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44.
Electrocrystallization and Physicochemical Properties of Nanosized Copper-Containing Powders S. A. Chulovskaya1 and V. I. Parfenyuk2 1Institute of Chemistry of Solutions, Russian Academy of Sciences, Akademicheskaya 1, Ivanovo, 153045 Russia 2Ivanovo State University of Chemistry and Technology, pr. F. Engel’s 7, Ivanovo, 153000 Russia Received November 16, 2007 Abstract — The electroctystallization mechanism of copper-containing powders from water–isopropanol solutions of copper dichloride is studied. The effect of the nature and concentration of solution components on the electroplating of cathodic deposits is considered. Morphological characteristics of particles of the synthesized powder are determined on a transmission electron microscope. The qualitative composition of synthesized powders is determined. PACS number: 81.07.Wz, 81.07.-b DOI: 10.1134/S207020510903006X
22/06/2009 | 1129 Hits | Print
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45.
Corrosion Protection of Mild Steel by Applying TiO2 Nanoparticle Coating via Sol-Gel Method1 A. Shanaghi, A. R. Sabour, T. Shahrabi, and M. Aliofkhazraee Surface Engineering Laboratory, Materials Engineering Department, Faculty of Engineering, Iran, Tehran, Tarbiat Modares
Unversity, P.O. Box: 14115–143 e-mail:
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Received November 2, 2007 Abstract — TiO2 nanoparticle coatings possess good thermal and electrical properties and they are resistant to oxidation, corrosion, erosion and wear in high temperature environments. This property is very important factor in the applications such as pipelines, castings and automotive industry. In this investigation a uniform TiO2 nanoparticle coating has been applied on mild steel, using sol-gel method. The coating was deposited on mild steel substrate by dip coating technique. The morphology and structure of the coating were analyzed using SEM, AFM and X-ray diffraction. The anticorrosion performances of the coating have been evaluated by using electrochemical techniques. It is worthy to note that the film uniformity was retained in high temperatures and no crack and flaking off from the substrate was observed. The Tafel polarization measurements provide an explanation to the increased resistance of TiO2 nanoparticle coated mild steel against corrosion and icorr was decreased from 18.621 to 0.174  A/cm2. PACS numbers: DOI: 10.1134/S2070205109030071
22/06/2009 | 1122 Hits | Print
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46.
Composite Electrochemical Coatings: Preparation, Structure, Properties V. N. Tseluikin Engels Technological Institute (Affiliated Branch) of Saratov State Technical University,
pl. Svobody 17, Engels, Saratov Oblast’, 413100 Russia Received May 19, 2008 Abstract — Results of studies in the field of electrochemical composition coatings (ECC) are presented. Methods of synthesis, functional properties, and structural peculiarities of the main types of ECC are considered. PACS numbers: 81.05.Ni, 82.45.Qr DOI: 10.1134/S2070205109030083
22/06/2009 | 1248 Hits | Print
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47.
PbO2 TiO2 Composite Electrodes A. B. Velichenko1, V. A. Knysh1, T. V. Luk’yanenko1, F. I. Danilov1, and D. Devilliers2 1 Ukrainian State University of Chemical Technology, pr. Gagarina 8, Dnepropetrovsk, 49005 Ukraine 2 Pierre and Marie Curie University (Paris 6), pl. Jussieu 4, Paris, 75252 France E-mail:
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Received May 20, 2008 Abstract — Electrodeposition of composite PbO2-based materials containing titanium dioxide particles was studied. The TiO2 content of the composite depends on the bath composition and the deposition conditions. Inclusion of TiO2 particles in PbO2 substantially changes the morphology and structure of the deposit. The oxygen overpotential at composite materials increased but the rate of the conversion of 4-chlorophenol into nontoxic compounds remained virtually unchanged. The lifetime of the electrodes containing the inert TiO2 phase was found to be twice as long as that of traditional PbO2 anodes. PACS numbers: 81.05.Ni, 82.45.Qr DOI: 10.1134/S2070205109030095
22/06/2009 | 1298 Hits | Print
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48.
Solving Modern Problems of a Coating Substrate System in a Viscoelastic Approximation N. O. Gonchukova Institute of Silicate Chemistry, Russian Academy of Sciences, nab. Adm. Makarova 2, St.-Petersburg, 199034 Russia E-mail:
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Received November 19, 2007 Abstract — Calculated stresses in amorphous metallic coatings, which were produced by plasma spray method and chemical deposition, are discussed. These coatings may serve as wear- and corrosionresistant coatings and magnetic shields. The calculations of stresses are carried out for composites containing chalcogenide glasses, which are used in electronics and optics. PACS numbers: 68.60.Bs DOI: 10.1134/S2070205109030101
22/06/2009 | 1244 Hits | Print
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49.
The Effect of 3-Methyl 1-Pentyn 3-Ol on the Corrosion of Al-Si-Cu Alloys in Acid Solutions by Using SEM, EDX and AAS1 A. Buyuksagisa, A. A. Aksutb, and D. Ozala a Afyon Kocatepe University Science and Art Faculty, Afyonkarahisar/TURKEY b Ankara University Science Faculty Chemistry Department Ankara/Turkey *e-mail:
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,
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22/06/2009 | 1011 Hits | Print
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50.
The Effect of Natural Ageing of Quickly Quenched Amorphous Fe75Si12B10Nb1Cu2 Alloys on Their Corrosion Behavior sin Acidic Sulfate Environments V. G. Makletsov1 and O. M. Kanunnikova2 1Udmurt State University, ul. Universitetskaya 1, Izhevsk, 426034 Udmurtia, Russia 2 Physical-Technical Institute, Ural Branch, Russian Academy of Sciences, ul. Kirova 132, Izhevsk 426000, Udmurtia, Russia E-mail:
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Received April 18, 2007 Abstract — The effect of natural ageing on the electrochemical and corrosion behavior of an amorphous Fe75Si12B10Nb1Cu alloy in acidic sulfate environments is studied. In its shape, the polarization curve is similar to that of the alloy, which was heat treated at 400 C. The ageing made the alloy brittle and unable to be soldered with acidic fluxes. PACS numbers: 82.45.Yz DOI: 10.1134/S2070205109030125
22/06/2009 | 1191 Hits | Print
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