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1.
Efficiency, Kinetics, and Chemism of Triboconversions of Lubricating Materials V. G. Mel’nikov All-Russia Research Institute of Oil Processing,
ul. Aviamotornaya 6, Moscow, 111116 Russia e-mail:
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Received August 7, 2005 Abstract — The mechanism and kinetics of the tribochemical conversions of lubricating materials (oils and greases) in the zones of rolling and sliding friction and the major pathways of their consumption were subjected to a logical system analysis. The thermodynamic “grease–bearing” system was considered as an open nonequilibrium system with the time-dependent effective rate of tribochemical conversions of the dispersive medium of a grease, which complicates its mathematical description compared to the classical first-order kinetics. The derived kinetic equation for tribochemical grease degradation allows one to predict, with a practically accept-able accuracy, the service life of the friction unit and the advancement and chemism of tribochemical processes. It was demonstrated that the effective rate of the process is a function of the length of the kinetic sequence of tribochemical reactions. The effects of the composition of the lubricating material, the kinematics of the unit in the friction and reserve zones, the structural materials, the friction parameters, and the temperature on the major pathways and chemism of tribochemical processes were analyzed. PACS numbers: 46.55.+d, 81.40.Pq DOI: 10.1134/S0033173206050018
12/09/2008 | 1113 Посещения | Печать
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2.
Probing the Atmospheric Corrosion of Metals. Zinc A. P. Nazarov and D. Thierry Swedish Corrosion Institute, Stockholm, Sweden e-mail:
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Received July 12, 2005 Abstract — Scanning vibrating capacitor (Kelvin probe) and electrochemical impedance spectroscopy are used in electrochemical monitoring of the atmospheric corrosion of zinc. The effect of the corrosion product layer on the surface potential and capacitance is studied. Upon the local application of NaCl, the spatial separation of the cathodic and anodic reactions was noticed in the profiles of the electrode potential and chemical composition of the corrosion products (infrared microscopy). The effect of corrosion inhibitors and activators on the electrochemical atmospheric corrosion of zinc is studied. PACS numbers: 82.45.Bb DOI: 10.1134/S003317320605002X
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3.
Analysis of Corrosion Behavior of Steel 3 in Chloride Solutions by Using Neural Networks V. D. Kiselev, S. M. Ukhlovtsev, A. N. Podobaev, and I. I. Reformatskaya Federal State Unitary Enterprise “Karpov Research Institute of Physical Chemistry,”
ul. Vorontsovo Pole 10, Moscow, 103064 Russia e-mail:
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Received May 9, 2005 Abstract — The method of neural-network analysis of experimental data is applied to the corrosion system for the first time. The neural-network simulation enables one to predict adequately the response of steel 3-chloridecontaining solution system to the external effects: the variations in the pH value and in the concentration of chloride ions. Trained neural network uniquely determines the characteristic potentials of corrosion system (the free-corrosion, passivation, and repassivation potentials) from the data on the chemical composition of corrosive medium and, based on these potentials, predicts the type of corrosion: active dissolution, passivity, or passivity with probable pitting. PACS numbers: 81.65.Rv, 82.45.Bb DOI: 10.1134/S0033173206050031
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4.
Formation of Coatings on Rectifying Metals and Alloys by Microarc Oxidizing in Electrolytes with a Capacitive Energy Control P. S. Gordienkoa, O. S. Vasilenkoa, E. S. Panina, S. B. Bulanovaa, D. V. Dostovalovb,
A. D. Zhirnovc, and S. V. Korkoshd a Institute of Chemistry, Far East Division, Russian Academy of Sciences,
pr. Stoletiya Vladivostoka 159, Vladivostok, 690022 Russia e-mail:
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b Far East State Technical University, Vladivostok, Russia c All-Russian Research Institute of Aviation Materials d Central Research Institute of Construction Materials “Prometei” Received April 19, 2005 Abstract — Coating formation on titanium and aluminum samples in aqueous electrolytes at breakdown potentials (under conditions of microarc oxidizing) is described. The oxidizing was performed with either no current restriction during the oxide film breakdown or with an additional reactive resistance in the external circuit allowing to control the energy input intensity to the breakdown channels. It is shown that the external reactive resistance increases the coating formation potentials with no visible additional breakdown areas; the final coating formation currents decrease by order of magnitude; the energy evolved in the electrolyte decreases by a factor of 5 to 10. The variable external reactive resistance allows forming coatings with novel properties. PACS numbers: 81.65.Rv, 82.45.Bb DOI: 10.1134/S0033173206050043
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5.
Electrodynamics of the Metal Solution Interface Boundary as a Natural Basis of Theoretical Electrochemistry R. R. Salem e-mail:
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Received May 8, 2005 PACS numbers: 82.45.Qr, 81.15.Pq DOI: 10.1134/S0033173206050055
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6.
Effect of Some Compounds on the Sensitivity of the Inhibitive Properties of o-Hydroxyazomethine Derivatives to Variation in the Polarity of Their Electrophilic Substituents V. P. Grigor’ev and V. V. Boginskaya Rostov State University, ul. Zorge 7, Rostov-on-Don, 344090 Russia e-mail:
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Received July 19, 2005 Abstract — The sensitivity of the protective effect of an inhibitor from a reaction series to the variation of the polarities of electrophilic substituents in its molecule depends on the nature and concentrations of salt additives. The correlations obtained for iron corrosion were interpreted in terms of the Linear Gibbs Energy Relation (LGER) and the Principle of Hard and Soft Acids and Bases (HSAB). PACS numbers: 82.45.Qr, 81.15.Pq DOI: 10.1134/S0033173206050067
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7.
Electrodeposition of Yellow Bronze from Acidic Sulfate Baths Containing Polyether Laprol and Micromolar Additives of Halides Z. Mockus, S. Kanapeckaité, V. Jasulaitiené, and A. Survila Institute of Chemistry, Göstauto 9, Vilnius, LT01108 Lithuania e-mail:
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Received April 23, 2005 Abstract — The composition of yellow bronze coatings deposited from acidic sulfate solutions added with polyether laprol and the electrodeposition conditions are studied by voltammetry and XPS. It is found that halides in rather low (micromolar) concentrations affect significantly the partial electrodeposition processes. Chlorides increases cathodic polarization, widen the current window of the yellow bronze electrodeposition, and favor the increase in tin content of the coatings. Bromides narrow the current window, lower the tin content in the coatings, and hinder the yellow bronze surface oxidation. Iodides inhibit the copper electroreduction markedly, which makes the yellow bronze deposition practically impossible. PACS numbers: 81.15.Pq, 82.45.Qr DOI: 10.1134/S0033173206050079 Keywords: copper, tin, deposition, polyether laprol, halides
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8.
Kinetics of Inhibition of Aluminum Corrosion in Hydrogen Chloride Electrolytes with Binary Salt Mixtures O. I. Bartenevaa and V. V. Bartenevb a Research Institute of Physical and Organic Chemistry,
pr. Stachki 194/2, Rostov-on-Don, 344090 Russia b Rostov State University, ul. Bol’shaya Sadovaya 105, Rostov-on-Don, 344007 Russia e-mail:
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Received May 19, 2005 Abstract — The kinetics of inhibition of aluminum corrosion with SnCl2 , CdCl2 , PbCl2 , and their equimolar binary mixtures was studied under contact exchange conditions. Prerequisites for synergism in these mixtures were determined. The parameter  of mutual influence of the components in the mixture was formally separated into the constituents associated with changes in the aluminum surface coverage with the contact deposit, s, and in the free corrosion potential of aluminum,   . In the mixtures studied, s > 1, while  < 1; however, the overall effect is synergism because s > 1/ . PACS numbers: 82.45.Qr, 81.15.Pq DOI: 10.1134/S0033173206050080
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9.
The Effect of Static Magnetic Field on the Propertiesof Acrylic Paints G. Bikul’chyus, R. Butkene, and A. Ruchinskene Institute of Chemistry, ul. Goshtauto 9, Vilna, 01018 Lithuania e-mail:
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Received June 17, 2005 Abstract — The effect of magnetic field on the protective properties of acrylic paints is studied using the methods of electrochemical impedance and infrared Fourier spectroscopy. It is found that pretreatment of paints with magnetic field deteriorates their decorative properties, whereas drying of acrylic paints in the field impairs their protective properties. PACS numbers: 81.65.Kn DOI: 10.1134/S0033173206050092
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10.
Anodic Dissolution of Ferrite Phases from Iron Carbon Ferrite Cementite Alloys with Different Forms of Cementite S. N. Saltykov and N. V. Tarasova Lipetsk State Technical University, ul. Moskovskaya 30, Lipetsk, 39800 Russia e-mail:
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Received September 1, 2005 Abstract — Methods of electrochemical analysis, metallography and mathematical statistics are applied to calculate the ferrite anodic dissolution rate from both the independent structural constituent and the subconstituent in lamellar or granular pearlite. The higher dissolution rate of the former compared to the latter is caused by the structure peculiarities. PACS numbers: 82.45.Qr, 81.15.Pq DOI: 10.1134/S0033173206050109
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