Influence of the Composition of the Liquid Phase and the Concentration of Benzohydrazide on Its Effectiveness during Cadmium Electrodeposition from WaterAcetone Perchlorate Electrolytes

V. V. Kuznetsov, L. M. Skibina, and R. R. Khalikov 
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Department of Chemistry, Southern Federal University, ul. Zorge 7, Rostov-on-Don, 344090 Russia

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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 ( = 10⁴ 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

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

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Received June 5, 2008

PACS number: 68.43.De

Determination of the Flory - Huggins Parameter for a Pair of Polymer Units from AFM Data for Thin Filmsof Block Copolymers

E. A. Men’shikov^1,2, 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

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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

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

PACS number: 81.07.Wz, 81.07.-b

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

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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 i_corr was decreased from 18.621 to 0.174 A/cm².

PACS numbers:

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

PbO₂TiO₂ 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

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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.

Solving Modern Problems of a CoatingSubstrate System in a Viscoelastic Approximation

N. O. Gonchukova

Institute of Silicate Chemistry, Russian Academy of Sciences, nab. Adm. Makarova 2, St.-Petersburg, 199034 Russia

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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.

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. Buyuksagis^a, A. A. Aksut^b, and D. Ozal^a

^a Afyon Kocatepe University Science and Art Faculty, Afyonkarahisar/TURKEY

^b Ankara University Science Faculty Chemistry Department Ankara/Turkey

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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

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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 400C. The ageing made the alloy brittle and unable to be soldered with acidic fluxes.