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(11/10) Ученые из ИФХЭ РАН и МГУ под руководством Ольги Виноградовой поняли, как «полосатая» гидрофобность..
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Results 91 - 100 of 118
91.

Formation of Metal (Iron)-Oxide Nanostructures and Nanocomposites by Reactive Sputtering and Low-Temperature Reoxidation

V. A. Kotenev, D. N. Tyurin, A. Yu. Tsivadze, M. A. Petrunin, L. B. Maksaeva, and T. P. Puryaeva

 

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

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Received February 5, 2008

 

Abstract — Morphology and composition of nanostructured metal-oxide coating prepared by iron reactive sputtering and subsequent low-temperature oxidation in air at 50°C were studied by atomic-force microscopy (with digital processing of images), X-ray diffraction, and resistance measurements. The growth kinetics of metaloxide nanoparticles constituting the sputtered metal-oxide composite was evaluated by the direct processing of surface AMF-images. According to the results of morphological studies after the low-temperature oxidation, the surface layer has complicated structure: the metal nanoparticles surrounded by the frame0Fe2O3 oxide phase merge to extended rod-like structures (globules) sized, on the average, 100–200 nm lengthwise, 20–30 nm in diameter. This structure allows explaining the coatings' functional properties important for their applications.

 

PACS numbers: 81.07.Bc

DOI: 10.1134/S003317320806009X
24/11/2008 | 1225 Hits | Print

92.

The Effect of Silicon on Hyperfine Structure and Corrosionframe0Electrochemical Behavior of Feframe1Cr Alloys

O. V. Kasparova,* Yu. V. Baldokhin,** and M. O. Anosova***

 

* Karpov Institute of Physical Chemistry, ul. Vorontsovo Pole 10, Moscow, 105064 Russia

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** Semenov Institute of Chemical Physics, Russian Academy of Sciences, ul. Kosygina 4, Moscow, 119991 Russia

*** Moscow State Institute of Steel and Alloys, Leninskii pr. 4, Moscow, 119049 Russia

Received September 15, 2007

 

Abstract — The effect of silicon on the corrosion–electrochemical behavior of iron alloys containing 15, 20, and 25% chromium in a 1 N H2SO4 solution at room temperature is investigated. With the use of Mössbauer spectroscopy, the hyperfine magnetic and electronic structure of the alloys is studied. With the Normos program package for processing spectra, the distribution function of hyperfine magnetic fields P(Hef), mean intensity of the effective magnetic field Hef, isomeric shift , electric quadrupole splitting eq, and other parameters are calculated. Spectroscopic data are compared to the results of polarization measurements. A correlation between the hyperfine structure and electrochemical behavior of the alloys in various potential ranges is found.

PACS numbers: 76.80.+y; 82.45.Bb

 

DOI: 10.1134/S0033173208060106
24/11/2008 | 1191 Hits | Print

93.

Peculiarities of Deposition of Amorphous Phosphate Coatings on MA-2 Magnesium Alloys

V. Burokas, A. Martushene, A. Ruchinskene, G. Bikul’chus, and R. Ramanauskas

 

Institute of Chemistry, ul. A. Goshtauto 9, Vilnius, 08018 Lithuania

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Received May 18, 2007

 

Abstract — Peculiarities of the amorphous phosphating process and the properties of obtained coatings are studied for magnesium alloys MA-2.

 

PACS numbers: 82.45.Bb

DOI: 10.1134/S0033173208060118
24/11/2008 | 799 Hits | Print

94.

Physicochemical Properties of Steel Surfaces with Titanium Nitride Ion-Plasma Sprayed Coating

A. I. Kostrzhitskii, T. V. Cheban, and R. A. Podolyan

 

Odessa National Academy of Food Technologies, ul. Kanatnaya 112, Odessa, 65039 Ukraine

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Received November 14, 2006

 

Abstract — In nutral media, the regularities of the electrochemical corrosion of a steel, that had been sprayed by ionic plasma with titanium nitride, are studied. It is shown that the coating porosity is the principal factor determining its protective properties. Quantitative data on the effect of operation conditions on the coating porosity and corrosion-electrochemical behavior in liquids are given. Empirical formulas describing the kinetics of increasing the number of corrosion craters are obtained. Guidelines concerning the using of the ionplasma coatings in the protecting of lean alloy steels against corrosion are formulated.

 

PACS numbers: 81.65.Kn

DOI: 10.1134/S003317320806012X
24/11/2008 | 912 Hits | Print

95.

Mutual Influence of Portions of Simple and Binary Inhibitors in the Acid Corrosion of Iron

V. V. Ekilik, G. N. Ekilik, A. G. Berezhnaya, and E. N. Balakshina

 

Southern Federal University, ul. Zorge 7, Rostov-on-Don, 344090 Russia

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Received October 22, 2007

 

Abstract — The effects of inhibitors as power functions of their concentrations were examined analytically and graphically. The mutual influence of their portions of the was estimated. The behavior of the inhibitors in solutions of H2SO4 and HClO4 was compared. The mechanism of the corrosion inhibition was proposed. It was found that the additives influence each other in the inhibition of iron dissolution and hydrogen depolarization.

 

PACS numbers: 82.45.Qr

DOI: 10.1134/S0033173208060131
24/11/2008 | 906 Hits | Print

96.

Acid Corrosion of Aluminum under Conditions of Contact Plating of Antimony

V. V. Bartenev* and O. I. Barteneva**

 

*South Federal University, ul. Zorge 7, Rostov-on-Don, 344090 Russia

**Research Institute of Physical and Organic Chemistry, pr. Stachki 194/3, Rostov-on-Don, 344104 Russia
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Received April 13, 2007

 

Abstract — Specific features of the corrosion behavior of aluminum is studied in NaCl solutions with addition of antimony iodide under contact exchange conditions. It was found that the corrosion rate depends non-monotonously on the additive concentration. By varying the exposure time, the conditions for the inhibitive action of the additive are found. The analysis of the time dependences of the inhibition coefficient and partial inhibition coefficients that characterize the changes in the free corrosion potential of aluminum and the blocking of its surface with the antimony deposit demonstrates the dominating effect of the latter factor.

 

PACS numbers: 82.45. Bb; 81.65.Kn

DOI: 10.1134/S0033173208060143
24/11/2008 | 847 Hits | Print

97.

Corrosion Protection Study of Nanocrystalline Plasma-Electrolytic Carbonitriding Process for CP-Ti

M. Kh. Alieva, A. Saboura, and P. Taherib

 

a Department of Materials Engineering, Faculty of Engineering, Tarbiat Modares University, Tehran, Iran

b Department of Materials Science, Faculty of Engineering, Tehran University, Tehran, Iran
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Received May 19, 2007

Abstract — The effect of various nanocrystalline plasma-electrolytic carbonitriding of a commercially pure titanium in a glycerol bath with various additives, such as carbamide, sodium nitrate, and triethanolamine, was studied. Effects of the bath composition on chemical composition and corrosion resistance of the PEC/N films were examined by means of X-ray diffraction (XRD), scanning electron microscopy (SEM), potentiodynamic polarization, and electrochemical impedance spectroscopy (EIS) in Ringer solution. The results showed that the films obtained in solutions with triethanolamine (T-film) had better corrosion resistance. A design of experiment (DOE) technique according to the Taguchi method, was used to optimize the process. The design was constituted of four factors, namely, triethanolamine concentration, electric conductivity of the bath, applied voltage, and duration of the process), each containing three levels. An analysis of the mean of signal-to-noise (S/N) ratio indicated that the corrosion resistance of plasma-electrolytically carbonitrided (commercially pure) Titanium was influenced significantly by the levels in the Taguchiorthogonal array. The optimized coating parameters for corrosion resistance are 1060 g/l for triethanolamine concentration, 360 mS/Cm for electric conductivity of the electrolyte, 260 Volts for applied voltage, and 9 minutes for treatment time. The percentage of contribution for each factor was determined by the analysis of vari-ance (ANOVA). The results showed that the applied voltage is the most significant factor affecting the corrosion resistance of the coatings.

PACS numbers: 82.45.Bb

 

DOI: 10.1134/S0033173208060155
24/11/2008 | 850 Hits | Print

98.

Study of Fractal Characteristics and Structure of the Filler Aggregates in Polymer Dispersions

O. V. Gorshkova, A. E. Chalych, and V. K. Gerasimov

 

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

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Received February 29, 2008

 

Abstract — Phase structure and morphology of nanosized-particle films, based on the monodisperse polystyrene filled with technically pure carbon KhM-72, are studied. To reveal the filler particles distribution in the polymer samples, their surface was etched in microwave plasma of oxygen discharge. The etched surface was analyzed by TEM, using an EM-301 microscope (Philips) with one-step carbon–platinum replicas. The system morphology was studied by determining the fractal dimension. The dependence of the fractal dimension on the number of the disperse phase particles was investigated. It is shown that at different filler concentrations the aggregates form by different mechanisms: the primary associates form by the cluster–particle mechanism; the secondary ones, by the cluster–cluster mechanism. At the filler concentration >15%, extensive networks with differently sized defects form in the system.

PACS numbers: 81. 05.Ni; 81.05.Qk; 82.35. Lr

DOI: 10.1134/S0033173208060167
24/11/2008 | 939 Hits | Print

99.

Determining the Integral Dissolution Rate of Two-Phase Alloys in Cryoliteframe0Alumina Melts

A. Yu. Filatov,* E. V. Antipov,* M. I. Borzenko,* S. Yu. Vasil’ev,* V. M. Denisov,*** V. V. Ivanov,** S. M. Kazakov,* Z. V. Kuz’minova,* V. K. Laurinavichyute,* V. V. Lunin,*  D. A. Simakov,** and V. I. Shtanov*

 

* Chemistry Department, M.V. Lomonosov Moscow State University, Moscow, 119991 Russia

** RUS-Engineering Ltd., ul. Pogranichnikov 37, Krasnoyarsk, 660111 Russia

*** Krasnoyarsk State University, pr. Svobodnyi 79, Krasnoyarsk, 660041 Russia

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Received November 20, 2007

 

Abstract — Electron microscopy and x-ray diffraction analysis are used in studying Cu–Fe and Ni–Fe–Al alloys upon their anodic polarization in a cryolite–alumina melt, thus, clarifying the regularities of their dissolution and the formation of oxide coatings. Based on the results obtained, a technique of determining the integral corrosion rate of the alloys is proposed.

PACS numbers: 82.45.Bb

DOI: 10.1134/S0033173208060179
24/11/2008 | 891 Hits | Print

100.
Inhibiting the Anodic Dissolution of a Steel with Polydiallyldimethylammonium Chloride and Acrylamide Copolymers with Trimethylammoniumethylacrylate Chloride and Sodium Acrylate

 

M. V. Boiko,* E. E, Akimova,** S. B. Bulgarevich,** and V. A. Fevraleva**

 

* Southern Scientific Center, Russian Academy of Sciences, ul. Chekhova 41, Rostov-on-Don, 344006 Russia

** Rostov State Transport University, pl. Rostovskogo strelkovogo polka narodnogo opolcheniya 2,
Rostov-on-Don, 344038 Russia

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Received March 3, 2007

 

Abstract — Polydiallyldimethylammonium chloride, as well as acrylamide copolymers with trimethylammoni-umethylacrylate, which are industrial flocculants, are tested as corrosion inhibitors on St45 steel. The inhibitor properties are manifested by polydiallyldimethylammonium chloride and acrylamide copolymer with trimethylammoniumethylacrylate chloride. These are determined by the adsorption of polymer molecules on the metal surface. The protective effect of inhibitors is estimated. A mechanism of the adsorption of the surface-active substances on an iron electrode surface is proposed.

 

PACS numbers: 82. 45. Bd

DOI: 10.1134/S0033173208060180
24/11/2008 | 822 Hits | Print

  

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