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Results 91 - 100 of 101
91.

Physicochemical Properties of Electrodeposits Based on Tungsten Carbide and Zirconium Diboride on Steels

V. V. Malyshev and A. I. Gab

 

National Technical University of Ukraine “Kiev Polytechnical Institute,” pl. Pobedy 37,
korp. 4, komn. 039, Kiev-56, 03056 Ukraine

Open International University of Human Development “Ukraine,” ul. Khorevaya 1g, Kiev-71, 04071 Ukraine

Received October 20, 2005

 

Abstract — The electrodeposition of coatings based on tungsten carbide and zirconium diboride on steel materials and their physicochemical and mechanical properties are studied. The coatings enhance the wear resistance of steel samples by a factor of 6–11 and the abrasive stability by a factor of 7–10.

 

PACS numbers: 81.15 Pq; 81.65.Kn

DOI: 10.1134/S0033173207010055
12/09/2008 | 1319 Hits | Print

92.

On the Mechanism of the Effect of Plastic Deformation on the Corrosion Resistance of High-Strength Cast Iron

D. A. Baranov

 

Donetsk National Engneering University, ul. Artema 58, Donetsk, 83000 Ukraine

Received September 14, 2005

 

Abstract — The mechanism of the effect of preliminary plastic deformation on the corrosion resistance of highstrength cast iron is analyzed. Based on the experimental results, a scheme of the mechanism considering the contribution of the variation in the number and shape of graphite inclusions to the anisotropy of corrosion rate of strained cast iron is proposed.

 

PACS numbers: 81.40.-z; 68.55.Gk

DOI: 10.1134/S0033173207010067
12/09/2008 | 1256 Hits | Print

93.

Anodic Dissolution of Iron Silicides in Alkaline Electrolyte

A. B. Sheina, I. L. Rakityanskayaa, and S. F. Lomaevab

 

a Perm’ State University, ul. Bukireva 15, Perm, 614600 Russia

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b Physicotechnical Research Institute, Russian Academy of Sciences, Ural Branch, Izhevsk, Russia

Received November 11, 2005

 

Abstract — Anodic dissolution of iron and its silicides (FeSi, FeSi2, as well as the eutectic alloy FeSi2–Si) and pure Si, in 0.1 to 5.0 N NaOH solutions is studied by cyclic voltammetry and x-ray photoelectron spectroscopy. Principal characteristic features of the silicide anodic dissolution are revealed and the composition of surface films investigated. It is shown that, despite an increase in Si solubility at higher pHs, the iron silicides are highly resistant to anodic dissolution due to especial protective properties of the complex oxide surface film.

 

PACS numbers: 81.65.Rv; 82.45.Bb

DOI: 10.1134/S0033173207010079
12/09/2008 | 1239 Hits | Print

94.

The Effect of Medium on the Corrosion and Electrochemical Behavior of Nickel

V. V. Parshutina, N. L. Bogdashkinab, and G. P. Chernovab

 

aInstitute of Applied Physics, Academy of Sciences of Moldova, ul. Akademicheskaya 5, Chisinau, MD-2028 Moldova

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

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Received January 13, 2006

 

Abstract — Electrochemical and corrosion properties of nickel in neutral, alkaline, and acidic solutions are studied. Chemical and phase composition of surface films and surface morphology are examined. The effect of electrolyte composition and concentration on the metal removal rate in the course of broaching is determined. Optical, electrochemical, and gravimetrical methods, x-ray diffraction analysis, and thermogravimetry were used in the work.

 

PACS numbers: 82.42.Bb; 82.45.Kr

DOI: 10.1134/S0033173207010080
12/09/2008 | 1178 Hits | Print

95.

Steady-State Anodic Dissolution of Iron in Neutral and Close-to-Neutral Media

A. Yu. Aleksanyan, A. N. Podobaev, and I. I. Reformatskaya

 

*FGUP GNTs RF Karpov Research Institute of Physical Chemistry, ul. Vorontsovo pole 10, Moscow, 103064 Russia

Received May 6, 2006

 

Abstract—In neutral and close-to-neutral solutions, which contain no surface-active substances, iron dissolves via a two-step scheme. The transfer of the first electron across the interface involves water molecules that dissociate during the adsorption; the transfer of the second electron limits the process under steady-state condi-tions. In parallel, a passivator, namely, adsorbed oxygen is formed via a similar scheme. The passivator is removed from the surface due to its chemical reaction with hydroxonium ions, water molecules, or hydroxide ions. The process is adequately described by a mathematical model based on an assumption that the metal dissolves from an energy-uniform surface free from passivating species.

 

PACS numbers: 82.85.Bb

DOI: 10.1134/S0033173207010092
12/09/2008 | 1092 Hits | Print

96.

Cadmium Electrodeposition from Waterframe0Acetone Perchlorate Baths

V. V. Kuznetsov, L. M. Skibina, and R. R. Khalikov

 

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

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Received October 20, 2005

 

Abstract — It is the composition of the bath that determines a) the nature of species adsorbed and reduced at the cathode (such as molecules of a nonaqueous solvent, perchlorate anions, metal ions, or their complexes with organic ligands) and b) the electrode reaction rate. The process is best inhibited in a range of water structure stabilization under conditions of the predominant adsorption of acetone molecules, when the discharge of electroactive species is preceded by their “constrained” dissociation during the penetration through the layer adsorbed at the cathode. The highest reduction rate was observed in the acetone structuration range, when the adsorption of perchlorate anions reaches a maximum because of the desalting effect of the mixed solvent and the selective solvation ('-effect).

 

PACS numbers: 81.15.Pk; 82.45 Cj

DOI: 10.1134/S0033173207010109
12/09/2008 | 1101 Hits | Print

97.

On Inhibiting the Iron Anodic Dissolution in Acid Sulfate Electrolyte by Tetrabutylammonium Cations

A. I. Marshakov, T. A. Nenasheva, A. A. Rybkina, and M. A. Maleeva

 

Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences,
Leninskii pr. 31, Moscow, 119991 Russia
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Received November 8, 2005

 

Abstract — The surface coverage with atomic hydrogen (frame0) is calculated for iron electrode as a function of the number of adsorbed tetrabutylammonium cations and hydrogen concentration in the metal phase (Cframe1). It is shown that the effect of the organic inhibitor of acid corrosion on the rate of iron potentiostatic dissolution is due to the increase in the frame2/Cframe3

ratio.

PACS numbers: 81.65.Kn; 81.65.Rv; 82.45.Bb

DOI: 10.1134/S0033173207010110
12/09/2008 | 850 Hits | Print

98.

Comparative Tests of Corrosion Inhibitors in Simulated Media of the Samaraneftegaz Oil Fields

L. S. Moiseevaa and A. E. Aisinb

 

a OOO Tsentr Issledovanii i Razrabotok, Russia

b Tsiolkovskii Russian State Technical University “MATI,” Leninskii pr. 55/1, building 2, Moscow, 119333 Russia

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Received June 24, 2005

 

Abstract — Corrosion inhibitors were tested in model media simulating the oil fields of the OAO Samaranefte-gaz (mineralized water and water separated from a water–hydrocarbon emulsion by settling). Their protective effects were estimated for different concentrations. The test inhibitors were found to be promising for use in the system protecting oil-field pipelines of the OAO Samaraneftegaz to ensure their safe operation.

 

PACS numbers: 81.65.Kn; 82.45.Bb

DOI: 10.1134/S0033173207010122
12/09/2008 | 951 Hits | Print

99.

Corrosion Inhibitors of the SNPKh Brand.
2. The P,N-Containing Corrosion Inhibitor for Protection of Oil-Field Equipment

 O. V. Ugryumova, O. A. Varnavskayaa, V. N. Khlebnikova, V. A. Ivanova, S. I. Vasyukova, G. V. Romanova, Ya. V. Ivshinb, R. A. Kaidrikovb, Kh. E. Kharlampidib, and F. Sh. Shakirovc

 

aOAO Research Institute of Oil-Field Chemistry (NIIneftepromkhim), ul. N. Ershova 29, Kazan, 420045 Russia

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bKazan State Technological University, ul. Karla Marksa 68, Kazan, 420015 Tatarstan, Russia

c TatNIPIneft’, Bugulma, Russia

Received September 6, 2005

 

Abstract — Series of functionalized pyridinium alkyl[poly(oxyethylene)] phosphites, isoquinolinium alkyl[poly(oxyethylene)] phosphites, pyridinium aryl[poly(oxyethylene)] phosphites, and isoquinolinium aryl[poly(oxyethylene)] phosphites were obtained and their properties were studied systematically. Some of them were found to be effective corrosion inhibitors in aqueous CO2- and H2S-containing media. Isoquinolinium dodecyl- and dodecylphenyl[dodeca(oxyethylene)] phosphites proved to be the best inhibitors. The iso-quinolinium aryl[poly(oxyethylene)] phosphites obtained were used to create a new corrosion inhibitor.

 

PACS numbers: 81.65.Kn; 82.45.Bb; 89.60.Ec

DOI: 10.1134/S0033173207010134
12/09/2008 | 931 Hits | Print

100.

Suppressing Sulfate-Reducing Bacteria, as well as Hydrogen Diffusion through Steel, by Inhibitors of AMDOR IC Type

V. I. Vigdorovichb, M. V. Vigdorovicha, A. V. Ryazanovb, and A. N. Zavershinskiib

 

a Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences,
Leninskii pr. 31, Moscow, 119071 Russia

b Derzhavin State University, Tambov, ul. Internatsional’naya 33, 392622 Russia
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Received May 20, 2004

 

Abstract — Suppressing both the vital activity of sulfate-reducing bacteria and hydrogen diffusion through a steel membrane by AMDOR IC inhibitors is studied at a free-corrosion potential, as well as cathodic and anodic polarization, of the membrane working surface.

 

PACS numbers: 81.65.Kn

DOI: 10.1134/S0033173207010146
12/09/2008 | 907 Hits | Print

  

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