Индекс цитирования

Авторизация






Lost Password?

Cover of magazine

News

(11/10) Ученые из ИФХЭ РАН и МГУ под руководством Ольги Виноградовой поняли, как «полосатая» гидрофобность..
Sorry this content is not available in your selected language....
Read More ...
(11/10) Ученые обнаружили пути проникновения вирусов гриппа и ВИЧ в организм
Sorry this content is not available in your selected language....
Read More ...
(17/04) Курс “Анализ геномных данных”, Москва, 2 – 11 июля 2012
Sorry this content is not available in your selected language....
Read More ...
(12/03) Впервые получено изображение атомов, движущихся в молекуле
Sorry this content is not available in your selected language....
Read More ...
 

Results 11 - 19 of 19
11.

Study of the Sorption-Kinetic Properties of Carbon Molecular Sieves

A. V. Bervenoa,b and V. P. Bervenob

 

a Kemerovo State University, ul. Krasnaya 6, Kemerovo, 650043 Russia

b Institute of Solid-State Chemistry and Mechanochemistry (Kemerovo Branch), Siberian Division,
Russian Academy of Sciences, Kemerovo, Russia

E-mail: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it , This e-mail address is being protected from spam bots, you need JavaScript enabled to view it

Received December 10, 2008

Abstract — To elucidate the role of the electron-exchange properties of arene molecules that form the pore walls of carbon molecular sieves in their interactions with sorbate molecules, the correlation between the electron-exchange and sorption-kinetic properties was studied. The electron-exchange properties were estimated by using quantum-chemical modeling based on the energies of formation of singly charged anions and cations and neutral (both oxidized and reduced) molecules.

PACS: 68.43.-h

DOI: 10.1134/S207020510904011X
19/08/2009 | 714 Hits | Print

12.

Heat-Resistant Glass-Ceramic Coatings Protecting Low-Alloyed  Steels against High-Temperature Gas Corrosion

K. Yu. Frolenkov

 

Orel State Technical University, Naugorskoe sh. 29, Orel, 302020 Russia

E-mail: laraostu.ru

Received December 13, 2007

Abstract — Glass-ceramic coating aimed at protecting low-alloyed and low-carbon steels under technological heating is developed; it decreases the metal losses to scale by a factor of 12, as well as substantially decreases the decarbonizing and dealloying of the metal surface. The coating is characterized by an optimum ratio of the refractory to glasslike phases, which provides a reliable adhesion of the coating to the metal. As a result of sintering solid and liquid phases, a barrier layer forms that prevents the oxygen penetration to the metal and, hence, decelerates the corrosion processes at the coating–metal interface under heating conditions.

PACS: 81.65.Kn

DOI: 10.1134/S2070205109040121
19/08/2009 | 656 Hits | Print

13.

New Copolymer Products from Cyclic Carbonates and Isocyanate-Containing Compounds

I. L. Beilin and V. P. Arkhireev

 

Kazan State Technological University, ul. Karl Marx 68, Kazan, 420015 Tatarstan, Russia

Kazan State Institute of Finances and Economy
E-mail: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it

Received December 11, 2008

Abstract — The anionic copolymerization of cyclic carbonates with aromatic and aliphatic diisocyanates is studied. The macro- and supramolecular structures of the resulting copolymer are determined. It is demonstrated that the strength and elasticity of the copolymer can be varied for various purposes.

PACS numbers: 81.05.Lq; 36.20.Fz

DOI: 10.1134/S2070205109040133
19/08/2009 | 678 Hits | Print

14.

Electroplating Tin from Acidic Sulfate Baths Containing Benzaldehyde

A. Survila, Z. Mockus, S. Kanapeckaitframe0, M. Samuleviframe1ienframe2, and V. Jasulaitenframe3

 

Institute of Chemistry, Goshtauto 9, Vilnius, LT01108 Lithuania

e-mail: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it

Received February 19, 2008

Abstract — Voltammetry and electrochemical impedance spectroscopy (EIS) are used in studying the kinetics of electroplating tin from 0.01 M Sn(II) baths containing 1 M H2SO4 and millimolar benzaldehyde (BA) additives. BA substantially decreases the reduction rate of Sn(II) in a broad range of cathodic polarization. Experimental EIS data are analyzed in terms of an equivalent R(Qdl[RaCaWa][RctQd]) circuit, including a Faraday process impedance ([RctQd] subcircuit), as well as diffusion and kinetic stages of BA adsorption ([RaCaWa] subcircuit). Values of the subcircuit elements are found to depend on the duration of a contact between the electrode
and solution and on the BA concentration. An increase in the charge transfer resistance (Rct) and a simultaneous decrease in the double layer capacitance (Qdl) indicate that the electrochemical reduction of Sn(II) is inhibited by the BA adsorption. With an increase in the cathodic polarization, the effect becomes more pronounced, which is manifested in the low current densities and negative impedance values.

PACS: 81.15.Pq

DOI: 10.1134/S2070205109040145
19/08/2009 | 632 Hits | Print

15.

The Corrosion Inhibition of Ti-alloy (VTframe09) in Mixture of H2SO4frame1NaF by Organic Compounds1

S. M. A. Hosseini, M. Mousavi, and M. Amiri

 

Department of Chemistry, Shahid Bahonar University of Kerman, Kerman 76169, Iran

e-mail: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it

Received July 10, 2007

Abstract — This investigation deals with corrosion behavior of high strength titanium alloy in concentrated sulphuric acid solution containing different concentrations (500, 1000, 1500 ppm) of fluoride ion (F) using various organic compounds (MPA, L–OH, NFP) as inhibitor, potentiodynamically. The open circuit potential values noted before and after each experiment, varied appreciably. These values were negative before polarization but after completion of the experiment turned positive and remained stable over long period of time. It is observed that cathodic current density values increase with increasing cathodic potential (more negative) and fluoride ion. The values of cathodic Tafel slopes derived from the curves (~110 – 140 mV/dec I) indicate hydrogen evolution reaction (h.e.r). The corrosion potential (Ecorr) varied slightly with addition of inhibitors. The corosion current densities (Icorr) increased with increasing fluoride ion concentration, but these values decreased appreciably when inhibitor (MPA) was used. SEM micrograph reveals reduction of pits in the presence of inhibitor (MPA). So this concludes that organic compound was used in this case acts as a good inhibitor.

 

PACS: 82.45.Qr

DOI: 10.1134/S2070205109040157
19/08/2009 | 733 Hits | Print

16.

Synergistic Inhibition between Schiffframe0s Bases and Sulfate Ion on Corrosion of Aluminium in Sulfuric Acid1

T. Sethia, A. Chaturvedia, R. K. Upadhyaya, and S. P. Mathurb

a Department of Chemistry, Government College, Ajmer, India

b Department of Pure and Applied Chemistry, M.D.S. University, Ajmer, India

e-mail: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it

Received April 15, 2008

Abstract — The effect of Schiff’s bases alone and Schiff’s bases with additive Na2SO4 on the corrosion of aluminium in H2SO4 have been investigated by using weight loss method. The present study revealed that aluminium in H2SO4 has been more efficiently inhibited by Schiff’s bases in the presence of additive Na2SO4 than Schiff’s bases alone due to the synergistic effect between Schiff’s bases and Na2SO4. Inhibition efficiency was found maximum upto 95.02% for aluminium in H2SO4 by Schiff’s bases in presence of additive Na2SO4. The adsorption of inhibitor accords with the Langmuir adsorption isotherm. Results obtained in both the cases indicate the dependence of inhibition efficiencies on the concentration of Schiff’s bases, additive Na2SO4 and also on the concentration of H2SO4 solution. The results show the increasing trends of inhibition efficiency with the concentration.

PACS: 82.45.Qr

DOI: 10.1134/S2070205109040169
19/08/2009 | 653 Hits | Print

17.

Laser-Ellipsometric Monitoring of Corrosive Attack

V. A. Kotenev and A. Yu. Tsivadze

 

Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Leninskii pr. 31, Moscow,
119991 Russia

e-mail: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it

Received October 10, 2008

Abstract — The problems under consideration are related to the development and practical application of laser, reflectometric, and ellipsometric methods of diagnostics of corrosion damage both at the micro and macro level. The following basic methods of probe laser and ellipsometric studies of corrosion electrochemical processes are considered: automatic and return-path ellipsometry, microscopic and video ellipsometric techniques, methods of light scattering, fluctuation and noise reflectometry, probe noise ellipsometry, microlocalized electrochemical processes, remote ellipsometry, laser and spectral tomography, and information optical 3D technologies for reconstructing the 3D structure of heterogeneous near-electrode layer. The primary attention was focused on the problems of application of laser and ellipsometric methods in the practice of real corrosion electrochemical studies.

PACS: 82.45.Cc

 

DOI: 10.1134/S2070205109040170
19/08/2009 | 654 Hits | Print

18.

Voltammetric Characteristics of the Metalframe0Oxideframe1Electrolyte System at Electrode Polarization with Pulse Voltage

P. S. Gordienkoa, E. S. Panina, A. V. Dostovalovb, and V. K. Usol’tsevb

 

a Institute of Chemistry, Far-East Division, Russian Academy of Sciences,
pl. Stoletiya Vladivostoka 159, Vladivostok, 690022 Russia

b Far-East State Technical University, ul. Pushkinskaya 10, Vladivostok, Russia

Received October 18, 2007

Abstract — The method of formation of oxide coatings on anodically polarized electrodes under galvanostatic mode with the online, computer-controlled measuring, processing, and calculation of electric parameters is proposed. Voltammetric characteristics of these processes are considered using a variable reactive resistance. It is shown that a thermal breakdown is preceded by an electric breakdown of potential barriers formed in the metal oxide–electrolyte system. In the oxide layer structure, three zones that differ in the structure and intensity of electric fields can be singled out. The ratio of these zones is determined by the electron work functions of metal, oxide, and electrolyte.

PACS: 82.45.Cc

DOI: 10.1134/S2070205109040182
19/08/2009 | 607 Hits | Print

19.

Analysis of Mathematical Models and a Theory of Polarization Distribution in Continuous 3D-Porous Electrodes

A. N. Koshev, V. K. Varentsov, and M. A. Chirkina

 

Penza State University of Architecture and Construction, ul. Titova 28, Penza, 440028 Russia

E-mail: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it

Novosibirsk State Technical University, pr. K. Marksa 20, Novosibirsk, 630092 Russia

E-mail: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it

Received April 25, 2008

Abstract — Conventional and original mathematical models describing the distribution of an electrochemical process in a continuous 3D volume electrode as in a pseudohomogeneous environment are discussed. Some peculiarities of the operation of such electrodes related to the appearance of anodic zones on a cathodically polarized electrode are considered. Mathematical analysis of the model equations and their solutions is given.

PACS: 82.45.Fk

DOI: 10.1134/S2070205109040194
19/08/2009 | 635 Hits | Print

<< Start < Prev 1 2 Next > End >>
  

Powered by AlphaContent 3.0.4 © 2005-2023 - All rights reserved