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(17/04) Курс “Анализ геномных данных”, Москва, 2 – 11 июля 2012
Уважаемые коллеги, Со 2 по 11 июля 2012 года Учебный центр Института биологии гена РАН организует практический десятидневный курс по статистическому анализу геномных дан...
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(12/03) Наблюдение за распределением зарядов в молекуле
Исследователи из Швейцарии впервые с помощью экспериментов смогли визуализировать распределение зарядов отдельной молекуле. Предполагается, что результаты работы могут при...
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(22/01) Простой способ разделения углеродных нанотрубок
Существуют одностенные углеродные нанотрубки [single-walled carbon nanotubes (SWCNT)] с металлическим и полупроводниковым типом проводимости, однако для использования этих...
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Результаты 1 - 10 из 19
1.

Effect of Low-Molecular Carbon Acids on Atmospheric Corrosion of Metals

A. A. Mikhailov

 

Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Moscow, Russia

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Received December 11, 2007

 

Abstract — A short review of studies on the atmospheric corrosion of metals in the presence of low-molecular carbon acids, as well as electrochemical studies aimed at elucidating the mechanism of acceleration of metal corrosion by low-molecular carbon acids are presented.

 

DOI: 10.1134/S2070205109070016
24/12/2009 | 632 Посещения | Печать

2.

Corrosion Electrochemical Behavior of Tinframe0 Cadmium Alloys in a Sulfate Solution

V. V. Ekilik, A. G. Berezhnaya, A. A. Gerashchenko, and G. N. Ekilik

 

South Federal University, Rostov-on-Don, Russia

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Received March 27, 2008

 

Abstract — The behavior of preeutectic (by cadmium) and eutectic tin–cadmium alloys is studied compared to pure metals. The dependence of main characteristics of direct- and reverse-run polarization curves on the alloy composition is established. Information is obtained on the ratio between inhibiting and promoting adsorption of benzotriazole and potassium oleate, depending on the potential, dissolution character, and alloy composition. To compare the results of work [1], the corrosion–electrochemical behavior of tin–cadmium alloys in a sulfate solution was studied, depending on their composition and potential E and also the effect of benzimidazole (BI) and potassium oleate (PO) on it.

DOI: 10.1134/S2070205109070028
24/12/2009 | 685 Посещения | Печать

3.

Effect of Products of Nitric Acid Reduction on Active Dissolution and Passivation of Nickel

V. P. Razygraev* and M. V. Lebedeva

 

Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Moscow

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Received March 27, 2008

 

Abstract — For nickel in HNO3 solutions, the passivation process is impeded and the range of its active dissolution is broadened, as opposed to in solutions of nonoxidative acids, which is stipulated by the interaction processes between metal surface and the products of cathode reduction of the solution. It has been shown that the products of cathode reaction promote the occurrence of a new electronegative reaction of nickel dissolution in the form of a complex with ammonia, the ligand formed on the cathode. Moreover, the intermediate products of NO reduction to NO2 by interacting with nickel surface displace passivating oxygen and, therefore, retard the process of electrode passivation. The kinetic control of the cathode reaction of HNO3 reduction within the potential range of active dissolution of nickel is connected with the complicated NO desorption from nickel surface, which virtually eliminates the possibility of the development of homogeneous autocatalysis within a certain potential range.

DOI: 10.1134/S207020510907003X
24/12/2009 | 705 Посещения | Печать

4.

Corrosion of Structure Materials and Their Weld Joints in the Environments of Monoethanolamine Gas Cleaning in Ammonia Production

V. A. Kachanov, Yu. B. Danilov, T. E. Shepil’, E. K. Gvozdikova, A. I. Kabashnyi, V. Yu. Kozin, and S. M. Ivanuna

 

Ukrainian Research Institute for Chemical Machine Building, ul. Marshala Koneva 21, Kharkiv, 61001 Ukraine

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Received July 2, 2008

 

Abstract — It is shown that the main cause of increased corrosion damage in equipment in units of monoethanolamine that remove CO2 from converter gas exceed the regulation levels of formic acid, as chloride ions are acquired in the equipment during the neutralization of formic acid with caustic containing chlorides, as are distorting hydrodynamic flows in columns due to the corrosion of inner items, which results in the working environment effecting the structural elements. In order to lower the corrosivity of the working environment, it is recommended to control the content of formic acid by keeping it below 0.1 g/l, to neutralize it with caustic containing no chloride ions, and to eliminate the distortion of hydrodynamic flows in the apparatus, thus preventing the impact effects of the environment.

 

DOI: 10.1134/S2070205109070041
24/12/2009 | 669 Посещения | Печать

5.

Corrosion Stability of Nanosize Pd/C, PdCo/C, and PdCoCr/C Catalytic Systems in Acidic Media for Fuel Cell Cathodes

M. R. Tarasevicha, D. V. Novikovb, G. V. Zhutaevaa, V. A. Bogdanovskayaa, L. A. Reznikovaa,
N. A. Kapustina
a, and V. V. Batrakovb

a Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Moscow, Russia

b Moscow Pedagogical State University, Moscow, Russia

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Received May 28, 2008

Abstract — An express method for determining the corrosion stability of palladium-based cathodic catalytic systems was developed. The method consists of cycling the electrode potential with a thin catalyst layer in 0.5M H2SO4 in the range of potentials of the fuel cell operation and a subsequent comparison of the characteristics of catalytic systems (specific surface area and activity in the oxygen reduction reaction) before and after the corrosion action. The suggested method was used to characterize the corrosion behavior of the Pd/C commercial catalyst, as well as the PdCo/C and PdCoCr/C catalysts synthesized at the Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences. According to the XRD data, they correspond to systems with a high level of alloy formation. It is shown that the PdCo/C and PdCoCr/C catalysts are considerably more stable towards corrosion action than 20% Pd/C (E-TEK). The results were compared with the stability data obtained using a chronoamperometric method.

DOI: 10.1134/S2070205109070053
24/12/2009 | 639 Посещения | Печать

6.

Metal Protection by Anticorrosion Papers in Humid Tropical Climate

V. N. Ivonina, Chin Kuok Khan’a, T’y Min Tiena, Yu. I. Kuznetsovb, N. N. Andreevb,
N. V. Lavrinova
b, and V. A. Karpovc

 

aJoint Russian and Vietnamese Tropical Research and Technology Center, Hanoi, Vietnam

bFrumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Moscow, Russia

cSevertsov Institute of Ecology and Evolution, Russian Academy of Sciences, Moscow, Russia

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Received January 15, 2008

 

Abstract — Results of 3-year full-scale field climatic tests on application of five types of inhibiting papers for anticorrosion protection of ferrous and nonferrous metals during storage in a humid tropical climate have been carried out by the Joint Russian and Vietnamese Tropical Research and Technology Center and presented here. It has been shown that the inhibiting paper IPCAS-118 can be recommended for anticorrosion protection of equipment made of steel, copper, and aluminum during 3-year storage in sheds in humid tropical climate conditions

DOI: 10.1134/S2070205109070065
24/12/2009 | 662 Посещения | Печать

7.

On the Use of Surfactants in the Production of Migrating Corrosion Inhibitors

E. V. Starovoitova, N. N. Andreev, I. A. Gedvillo, and A. S. Zhmakina

 

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

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Received April 8, 2008

 

Abstract — The effect of surfactants on the ability of an inhibitor to penetrate cast stone and protect the reinforcing steel is studied. With accelerated methods, the effectiveness of IFKhAN-80, IFKhAN-80M, MCI 2020, NaNO2, NaNO2 + “A”, and “A” surfactants as migrating inhibitors is estimated. An IFKhAN-80M composite is found to provide the effective protection of steel under conditions simulating the effect of migrating inhibitors.

DOI: 10.1134/S2070205109070077
24/12/2009 | 675 Посещения | Печать

8.

Inhibition of Carbon Steels from Hydrogen-Sulfide Corrosion with Triazoles

L. V. Frolova, Yu. I. Kuznetsov, and O. O. Zel’

 

Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Moscow, Russia

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Received July 2, 2008

 

Abstract — The protective effect of six organic triazole series compounds with respect to carbon steels in water chloride solutions with high concentration of H2S (2 g/l) has been studied. Under these conditions, the most efficient inhibitor of hydrogen-sulfide corrosion is 3-N,N-dibenzoamino-1,2,4-triazole (DBAT) and the least efficient is 1,2,3-benzotriazole. DBAT can suppress or considerably slow down the hydrogen-sulfide corrosion of steels due to the inhibition of both electrode reactions on the surface.

DOI: 10.1134/S2070205109070089
24/12/2009 | 693 Посещения | Печать

9.

Influence of Catamine AB on the Reaction of Hydrogen Discharge and Its Diffusion into Steel in Acidic Chloride Media

L. E. Tsygankova, A. S. Protasov, and D. B. Balybin

 

Tambov Derzhavin State University, Tambov, Russia

e-mail: vits21@mauju

Received February 19, 2008

 

Abstract — The regularities of the hydrogen discharge and its diffusion into St3 steel in acidic chloride solutions with various pH and the influence of the inhibitor catamine AB on these processes have been investigated. The constants of the velocities of the main stages of these processes, degrees of the surface filling of steel by the adsorbed hydrogen and its near-surface concentration are calculated.

 

DOI: 10.1134/S2070205109070090
24/12/2009 | 674 Посещения | Печать

10.

Adsorption of 5-Phenyltetrazole on Iron and Its Inhibition of the Dissolution of Low-Carbon Steel in a Neutral Solution

N. P. Andreevaa, L. P. Kazanskiia, I. A. Selyaninova, Yu. I. Kuznetsova, and V. A. Ostrovskiib

 

a Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Moscow, 119991 Russia

b St. Petersburg State Technological University, St. Petersburg, Russia

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Received July 21, 2008

 

Abstract—The anodic behavior of St3 steel in a neutral borate buffer solution containing various concentrations of 5-phenyl (PTA) and aggressive sodium chloride additives and the adsorption PTA on the surface of pure iron are studied. Ellipsometry is used to show that the adsorption of PTA begins at concentrations of less than 10–6 mol/l, which is three orders of magnitude lower than that for an inhibitor such as benzotriazole (BTA). It was shown by X-ray photoelectron spectroscopy that the PTA adsorption is reversible at low exposures of samples in a solution. PTA forms a layer more than 1 nm thick only upon the exposure of samples in the solution for more than 48 h. PTA can reduce the passivation current, though less effectively than BTA. PTA hampers the local depassivation of steel more effectively than BTA.

DOI: 10.1134/S2070205109070107
24/12/2009 | 702 Посещения | Печать

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