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101.
Equilibrium Adsorption of Fluorides from the Gaseous Phase on Tungsten Single Crystals Yu. V. Lakhotkin and V. L. Goncharov Frumkin Institute of Electrochemistry, Russian Academy of Sciences, Leninskii pr. 31, Moscow, 117071 Russia e-mail:
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Received January 25, 2007 Abstract — This paper is devoted to a theoretical analysis of equilibrium adsorption of the components of the W–F system on the basal planes of a tungsten single crystal. A complete data bank of thermochemical constants has been compiled for tungsten fluorides in the monomeric and oligomeric forms and for fluorine. Equilibrium pressures of gaseous components of the W–F system have been calculated in a wide temperature range; the gaseous phase has been shown to mainly contain WF6, WF3, WF4, and F. Equilibrium parameters of adsorption for all components on W (100) and (110) planes have been calculated to show that these planes are saturated mostly by tungsten pentafluoride and elementary fluorine. The degree of coverage depends only moderately on the temperature and the total pressure of the reaction mixture. There is a specific feature of the adsorbed layer in fluoride systems in the existence of very strong lateral interactions between the adsorbed fluorides and fluorine. DOI: 10.1134/S0033173208070011
24/11/2008 | 1327 Посещения | Печать
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102.
Atmospheric Corrosion of Metals in Regions of Cold and Extremely Cold Climate (a Review) A. A. Mikhailov*, P. V. Strekalov, and Yu. M. Panchenko Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Moscow, 119991 Russia
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, *e-mail:
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Received April 4, 2007 Abstract — The results of atmospheric corrosion tests on a series of metals and alloys in marine and industrial atmospheres of the Earth’s regions with cold and very cold climate (Antarctic, sub-Arctic, Russian Far East) are considered. The class of most dangerous corrosive damage includes special types such as pitting, exfoliation corrosion, crevice corrosion and corrosion-induced cracking. Long-term prognosis is made concerning the influence of global warming on the atmospheric corrosion in cold climate regions. DOI: 10.1134/S0033173208070023
24/11/2008 | 1192 Посещения | Печать
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103.
Effect of Cold Deformation on the Properties and Structure of Corrosion-Resistant Alloy KhN30MDB T. V. Svistunova Bardin Central Research Institute for the Iron and Steel Industry, Vtoraya Baumanskaya ul. 9/23, Moscow, 107005 Russia e-mail:
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Received July 18, 2007 Abstract — The effect of the degree of cold deformation on the structure and mechanical and corrosive properties of the corrosion-resistant alloy KhN30MDB have been studied in detail. Deformation regimes that provide for a high level of strength properties and satisfactory plasticity, combined with high corrosion resistance, including general and pitting corrosion and sulfide corrosion cracking in hydrogen sulfide, have been determined. DOI: 10.1134/S0033173208070035
24/11/2008 | 1196 Посещения | Печать
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104.
Increasing the Corrosion Resistance of Oil Production Equipment and Pipelines R. K. Vagapov PermNIPIneft' Company, Perm, Russia e-mail:
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Received April 5, 2007 Abstract — The protective properties of corrosion inhibitors have been studied in stratal waters of some oil fields located in the Perm region and the Timano-Pechorsk oil and gas bearing province, which are characterized by a high level of mineralization and contain corrosion- aggressive components. The ability of inhibitors to produce protective aftereffect is evaluated. The dependence of the anodic and cathodic processes on steel on the composition of medium, corrosive agents, temperature, and inhibitors has been studied by electrochemical techniques. DOI: 10.1134/S0033173208070047
24/11/2008 | 1193 Посещения | Печать
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105.
Protection of Carbon Steels against Atmospheric Corrosion in a Wet Tropical Climate Using Gas-Plasma Metallization with Aluminum R. A. Tupikova, Yu. G. Dragunova, I. L. Kharinab, and D. S. Zmienkob a FSUE OKB Gidropress, ul. Ordzhonikidze 21, Podol’sk, Moscow oblast, 142103 Russia b SRC RF NPO TsNIITMASh, ul. Sharikopodsipnikovskaya 4, Moscow, 115088 Russia e-mail:
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Received June 20, 2007 Abstract — Results of testing for resistance to atmospheric corrosion in a humid-tropical climate (in experimental chambers and under outdoor conditions) have been performed for templates of ribbed pipes made of a carbon steel with various types of anticorrosion (paint, diffusional, metallic) coatings. An optimum type of coating has been deter-mined, its properties have been investigated, and the optimum thickness was found that proved to be good at corrosion resistance in ribbed pipes and allowed for the specificity of structural and service features of the equipment to be protected. DOI: 10.1134/S0033173208070059
24/11/2008 | 1167 Посещения | Печать
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106.
Protection of Carbon Steels against Atmospheric Corrosion in a Wet Tropical Climate Using Gas-Plasma Metallization with Aluminum R. A. Tupikova, Yu. G. Dragunova, I. L. Kharinab, and D. S. Zmienkob a FSUE OKB Gidropress, ul. Ordzhonikidze 21, Podol’sk, Moscow oblast, 142103 Russia b SRC RF NPO TsNIITMASh, ul. Sharikopodsipnikovskaya 4, Moscow, 115088 Russia e-mail:
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Received June 20, 2007 Abstract — Results of testing for resistance to atmospheric corrosion in a humid-tropical climate (in experimental chambers and under outdoor conditions) have been performed for templates of ribbed pipes made of a carbon steel with various types of anticorrosion (paint, diffusional, metallic) coatings. An optimum type of coating has been deter-mined, its properties have been investigated, and the optimum thickness was found that proved to be good at corrosion resistance in ribbed pipes and allowed for the specificity of structural and service features of the equipment to be protected. DOI: 10.1134/S0033173208070059
24/11/2008 | 1159 Посещения | Печать
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107.
Corrosion and Degradation of Platinum-Based Electrocatalysts in Concentrated Phosphoric Acid M. R. Tarasevich, E. N. Lubnin, N. M. Zagudaeva, and E. A. Maleeva* Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Moscow, 119991 Russia *e-mail:
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Received June 5, 2007 Abstract — The degradation of nanodimensional platinum catalysts in concentrated phosphoric acid and the related changes in the kinetics of cathodic oxygen reduction have been studied in the course of accelerated corrosion tests. The results of structural and electrochemical investigations showed that the stability of such electrocatalytical systems substantially depends on the type of supporting carbon and the metal phase composition. DOI: 10.1134/S0033173208070060
24/11/2008 | 1246 Посещения | Печать
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108.
Steel Corrosion Inhibition by Benzoic Acid Salts in Calcium Hydroxide Solutions N. N. Andreev, E. V. Starovoitova, and N. A. Lebedeva Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Moscow, Russia e-mail:
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Received January 25, 2007 Abstract — The influence of salts of substituted benzoic acids on steel behavior in chloride–containing solutions Ca(OH)2 was studied. It was shown that the studied compounds inhibit local metal depassivation, elevating its potential and extending its induction period. The efficiency of inhibiting protection decreases when both hydrophilic and hydrophobic substituents are introduced in the aromatic nucleus of benzoic acid. The possible mechanism of the influence of substituent nature on protective properties of the studied compounds was considered DOI: 10.1134/S0033173208070072
24/11/2008 | 1314 Посещения | Печать
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109.
Inhibition of Hydrogen Sulfide Corrosion of Steel by Catamin AB L. V. Frolova, E. V. Tomina, L. P. Kazanskii, and Yu. I. Kuznetsov Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Moscow, Russia e-mail:
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Received March 16, 2007 Abstract — The protective properties of a quaternary ammonium salt (dimethyl alkyl benzyl ammonium chloride, or catamin AB) have been studied in wide intervals of concentrations of H2S (from 10 to 2000 mg/l) and of the inhibitor (from 25 to 500 mg/l). It is shown that catamin AB, which effectively slows down the corrosion of steels and preserves their plastic properties in aqueous solutions saturated by hydrogen sulfide to approximately  = 2000 mg/l, does not possess high protective properties in the same solutions at  = 0.0–50.0 mg/l. According to the results of XPS studies, this fact is connected to the weak adsorption of this inhibitor on the surface of steel in the absence of a film of iron sulfides on it. Based on the XPS data, it has been shown that, in media containing high concentrations of H2S, a thin (a few nanometers thick) film of iron sulfides is formed on steel. This film is covered with a monomolecular layer of catamin AB, impeding the dissolution of the steel and further growth of the sulfide film. DOI: 10.1134/S0033173208070084
24/11/2008 | 1311 Посещения | Печать
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110.
Corrosion Inhibitors for Small-Scale Heat-Supply Systems Yu. V. Balaban-Irmenin and N. G. Fokina* All-Russia Thermal Engineering Institute, Moscow, 109280 Russia *e-mail:
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Received March 29, 2007 Abstract — Stationary oxygen concentration in a closed heat-supply system, which is filled and replenished with nondeaerated water at a temperature of 20°C, has been calculated. The calculation takes into account the system surfaceto- volume ratio and the relative added makeup water volume fraction. In the case of a system using corrosion inhibitors, the stable oxygen concentration at a preset makeup rate falls within 400–800  g/dm3. Experiments performed in a special setup for polarization measurements showed that, at an oxygen concentration of 600 g/dm3, a decrease in the general internal corrosion rate can be achieved using IOMS-1 and PAF-13A inhibitors at a concentration of 4 5mg/dm3, or a zinc complex of oxyethylidenediphosphonic acid at 25 mg/dm3. DOI: 10.1134/S0033173208070096
24/11/2008 | 1284 Посещения | Печать
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