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(11/10) Ученые из ИФХЭ РАН и МГУ под руководством Ольги Виноградовой поняли, как «полосатая» гидрофобность..
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(11/10) Ученые обнаружили пути проникновения вирусов гриппа и ВИЧ в организм
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(17/04) Курс “Анализ геномных данных”, Москва, 2 – 11 июля 2012
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(12/03) Впервые получено изображение атомов, движущихся в молекуле
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Results 11 - 20 of 23
11.

Physicochemical Properties of Coatings Formed on Titanium by Microarc Oxidation with Energy Regulation in Breakdown Zones

P. S. Gordienko, U. V. Kharchenko, S. B. Bulanova, E. S. Panin,
V. K. Usol’tsev*, and V. A. Dostovalov*

 

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

*Far East State Technical University

Received May 3, 2007

 

Abstract — Electrochemical and electrophysical properties of surface layers formed on VT1-0 titanium in phosphate electrolyte with the current in zones of oxide-layer breakdown limited due to the use of a phenomenon of electromagnetic induction, that allows one to control the energy supply to breakdown channels, are considered. It is shown that coatings synthesized with external regulation of reactive resistance differ from those formed without limiting the energy by taking smaller concentrations of charge carriers and a higher electric resistance. The galvanic couples that involve samples with films formed this way demonstrate the lower contact corrosion current as compared with samples treated without limitations for energy in the breakdown zones.

 

PACS numbers: 82.45. Cc; 81.15. Pq

DOI: 10.1134/S0033173208050111
12/09/2008 | 1002 Hits | Print

12.

Nickel Electroplating from Glycine Containing Baths with Different pH

N. V. Sotskaya and O. V. Dolgikh

 

Voronezh State University, Universitetskaya pl. 1, Voronezh, 394006 Russia

Received January 26, 2007

 

Abstract — Peculiarities of nickel electroplating from glycine-containing baths with different pH are considered as a function of the following factors: amino acid concentration, temperature, potential scan rate, and rotation rate of a disk electrode. Based on these data, a possible mechanism is proposed. It assumes that all the complexes present in the bath are reduced simultaneously so that the recorded cathodic current is determined by each current contribution. In the process, the reduction of Ni(II) glycinate complexes proceeds irreversibly and is controlled by the charge-transfer stage. The process involves an adsorption stage and a stage of a preliminary chemical reaction. The latter may represent the dissociation of nickel complexes or their mutual transformations caused by pH variations in the near-electrode solution layer.

 

PACS numbers: 81.15.Pg

DOI: 10.1134/S0033173208050123
12/09/2008 | 965 Hits | Print

13.

Electroplating Lead-Indium Alloy from Trilonate Solutions in a Magnetic Field

V. V. Povetkin, T. G. Shibleva*, and A. V. Zhitnikova*

 

Tyumen State Oil and Gas University, ul. Volodarskogo 38, Tyumen, 625000 Russia

* Tyumen State University, ul. Semakova 10, Tyumen, 625003 Russia

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

Received September 22, 2006

 

Abstract — Electroplating lead–indium alloys from trilonate electrolytes and the effect of a constant magnetic field on the process are studied. The structure of alloys deposited under various electrolysis conditions is determined by means of x-ray diffraction technique and raster electron microscopy. Plating coatings in a magnetic field increases the current efficiency of the alloy and the content of the electrochemically positive component in it, results in a finer structure, and leads to the smoother surface relief and better quality of the coating.

 

PACS numbers: 81.15.Pq

DOI: 10.1134/S0033173208050135
12/09/2008 | 986 Hits | Print

14.

Chemical and Environmental Assessment of Shoaling Sea Water Contamination with Heavy Metals

 

A. P. Suponina, M. D. Koryakova, and P. S. Gordienko

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

Received November 28, 2007

 

Abstract — A biofouling community on frosted glass in the first succession stage that includes plankton organisms and juvenile balanuses as well as bivalvia Mytilus trossulus served as the object of biological monitoring for comparative assessment of the heavy-metal contamination level of sea water in polluted and background near-shore water areas. It is noted that the mineral composition of the biofouling microcommunity may point to the local chemical and ecological state of the environment in a sea area under study.

 

PACS numbers: 92.40.Oj

DOI: 10.1134/S0033173208050147
12/09/2008 | 832 Hits | Print

15.

Chemical and Environmental Assessment of Shoaling Sea Water Contamination with Heavy Metals

 

A. P. Suponina, M. D. Koryakova, and P. S. Gordienko

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

Received November 28, 2007

 

Abstract — A biofouling community on frosted glass in the first succession stage that includes plankton organisms and juvenile balanuses as well as bivalvia Mytilus trossulus served as the object of biological monitoring for comparative assessment of the heavy-metal contamination level of sea water in polluted and background near-shore water areas. It is noted that the mineral composition of the biofouling microcommunity may point to the local chemical and ecological state of the environment in a sea area under study.

 

PACS numbers: 92.40.Oj

DOI: 10.1134/S0033173208050147
12/09/2008 | 802 Hits | Print

16.

Chemical and Environmental Assessment of Shoaling Sea Water Contamination with Heavy Metals

 

A. P. Suponina, M. D. Koryakova, and P. S. Gordienko

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

Received November 28, 2007

 

Abstract — A biofouling community on frosted glass in the first succession stage that includes plankton organisms and juvenile balanuses as well as bivalvia Mytilus trossulus served as the object of biological monitoring for comparative assessment of the heavy-metal contamination level of sea water in polluted and background near-shore water areas. It is noted that the mineral composition of the biofouling microcommunity may point to the local chemical and ecological state of the environment in a sea area under study.

 

PACS numbers: 92.40.Oj

DOI: 10.1134/S0033173208050147
12/09/2008 | 837 Hits | Print

17.

Calculation of Potential Distribution, Current Density, and Parameters of Electrochemical Protection of the Inner Surface of Cylindrical Tanks

E. A. Ivliev* and A. V. Polyakov**

 

*St. Petersburg State Sea Technical University, ul. Lotsmanskaya 3, St. Petersburg, 190008 Russia

**OOO “Sistemy Effektivnogo Teplosnabzheniya” “SET”, ul. Zaitseva 4/2, office 206, St. Petersburg, Russia

Received October 16, 2006

 

Abstract — Methodic problems of calculating the parameters of cathodic protection of the inner surface of cylindrical tanks are considered. The procedure is based on the exact calculation of the potential and current distributions for different schemes of the arrangement of anodes. The effectiveness of the procedure is illustrated by thethe example of the cathodic protection of a hot water storage tank.

 

PACS numbers: 81.65.Kn

DOI: 10.1134/S0033173208050159
12/09/2008 | 974 Hits | Print

18.

A Study of the Thermal Degradation of Poly(Vinyl Chloride)

K. A. Polozkov, A. E. Chalykh, V. K. Gerasimov, V. V. Matveev, and A. D. Aliev

 

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 February 29, 2008

 

Abstract — A thermal degradation of poly(vinyl chloride) (PVC) was studied. This was an essential step in the investigation of the compatibility of PVC-based systems because mixing in industry and in the preparation of materials is carried out in the viscous flow range close to thermal degradation.

 

PACS numbers: 68.60.Dv; 82.35.–x

DOI: 10.1134/S0033173208050160
12/09/2008 | 891 Hits | Print

19.

Assessment of Intergranular Corrosion of Heat Treated Austenitic Stainless Steel (AISI 316L Grade) by Electron Microscopy and Electrochemical Tests1

A. Kriaa, N. Hamdi, H. Sidhom

 

a Departement de Chimie, Ecole Superieure des Sciences et Techniques de Tunis,
Rue Taha Hussein-Montfleury Tunis, Tunisia

b Unite de recherche sur les materiaux, Institut National de Recherche Scientifique et Technique,
Tunis, BP 95-2050 Hammam lif, Tunisia

c Laboratoire de Mecanique et Materiaux de l’ESSTT, 5 avenue Taha Hussein 1008,
Montfleury, Tunis, Tunisia

Received June 23, 2007

 

Abstract — The resistance of austenitic stainless steel to intergranular corrosion (IGC) varies during the process of aging at temperatures between 500 and 700frame0C. This follows the well-known phenomena of precipitating of M23C6 chromium carbides and intermetallic phases (, , ). Consequently, this leads to significant Cr-depletion zones at grain boundaries responsible for material sensitization to IGC. The assessment of the sensitivity to IGC from the Strauss or equivalent tests requires cutting a sample off the material, which can be harmful to the integrity of the structure in service. Such a sampling is in essence only qualitative and insufficiently sensitive to the low widths of Cr-depletion at the beginning of precipitation. The DL-EPR method (Double-Loop Electrochemical Potentiodynamic Reactivation test) is known to be a non-destructive and quantitative test method of detecting relatively mild degrees of sensitization in austenitic stainless steel. The current ratios Ir/Ia > 1% (sensitization criteria) and, as a consequence, the electric charge ratios Qr/Qa > 1% of the degree of sensitization (DOS) to intergranular corrosion can be considered as good parameter values to differentiate materials with only difference in the DOS and to detect the fine precipitation responsible for the depletion in the elements of an alloy. This criteria is also valid for the detection of desensitization during aging for longer periods of time.

 

PACS numbers: 81.65.Kn; 81.65.Rv

DOI: 10.1134/S0033173208050172
12/09/2008 | 947 Hits | Print

20.

Effects of Alcohols on the Corrosion of Aluminum Alloys in 1 N HCl Solution. Part II1

A. Buyuksagisa and A. A. Aksutb

 

a Afyon Kocatepe University Science and Art Faculty, Afyon,Turkey

b Ankara University Science Faculty, Ankara, Turkey

Received March 12, 2007

 

Abstract — The use of alcohols as cathodic inhibitors in HCl solution results in a negative shift of corrosion potential (Ecor). The alcohols concentration of 20 mM, was shown to be the best one. EDX analyses of the alloys showed different intermetallics at the surface of alloys, which made the activity of alcohols in the studied solutions change depending on the surface morphology of the alloys. Experiments indicated that the alcohols adsorption of the alloys in HCl solution obeys Temkin adsorption isotherm rule. The corrosion of the alloys in the solutions was affected by alloying with Cu, Zn, and Mg. For a comparison, pure forms of Al, Cu, Zn, Mg were tested in the solutions.

 

PACS numbers: 82.45.Bb

DOI: 10.1134/S0033173208050184
12/09/2008 | 978 Hits | Print

  

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