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11.
To the Electric Conductivity of Solutions R. R. Salem The Higher Chemical College, Russian Academy of Sciences, Miusskaya pl. 1, Moscow, Russia e-mail:
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Received January 25, 2005 Abstract — A semiphenomenological theory of the electrolyte conductivity based on the polarization interactions between the solution components is proposed.
20/09/2008 | 859 Hits | Print
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12.
Initial Stages of Nickel Passivation and Dissolution in Acidic Sulfate Solutions A. N. Podobaev and I. I. Reformatskaya Russian Federation Scientific Center “Karpov Research Institute of Physical Chemistry,”
ul. Vorontsovo pole 10, Moscow, 103064 Russia e-mail:
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Received May 18, 2005 Abstract—Regularities of the electrochemical dissolution of freshly formed surface (FFS) of iron and nickel are similar as a whole, but exhibit a number of distinctions. At an oxidation stage Me0–Me+, a water molecule chemisorbs to form a surface complex with charge transfer; however, a mean fraction of transferred charge in the complex of nickel (0.8) is significantly higher than that of iron (0.5). In weakly acid sulfate solutions (pH1.7–3.2), the iron FFS dissolution is predominantly inhibited by hydrogen atoms formed by the discharge of hydroxonium ions and adsorbed at the dissolution centers. On nickel at pH > 2.7, the inhibition is caused by the formation of adsorbed oxygen corresponding to more positive potentials in a range of active nickel dissolution.
20/09/2008 | 904 Hits | Print
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13.
Inhibition of Copper and Zinc Dissolution with 5(6)-Nitrobenzoimidazoles in Phosphate Electrolytes Yu. I. Kuznetsov and L. P. Podgornova Institute of Physical Chemistry, Russian Academy of Sciences,
Leninskii pr. 31, Moscow, 119991 Russia e-mail:
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Received December 9, 2004 Abstract — Effects of the concentration and chemical structures of 2-substituted 5(6)-nitrobenzoimidazoles (5(6)-NO2-2-R-BIs) on the dissolution of copper and zinc in phosphate electrolytes were studied. Introduction of the nitro group into benzoimidazole derivatives was found to make them more effective for copper but less effective for zinc; this is due to an increased degree of dissociation of the nitro derivatives and the possibility of ionic bonding in their complexes. The protective effects of 5(6)-NO2-2-R-BIs on copper and zinc depend on their chemical structures and are accurately described by the equation  = a     I. The sign and magnitude of indicate that electron-withdrawing substituents in 5(6)-NO2-2-R-BIs enhance the protection of copper, while electron-donating ones enhance the protection of zinc; this is due to different abilities of these metals to form - and  -bonds in their complexes.
20/09/2008 | 864 Hits | Print
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14.
Effect of Crown Ether on the Electrodeposition of a Copper Cadmium Alloy from Aqueous Ethanol Perchlorate Baths V. V. Kuznetsov, L. M. Skibina, and S. V. Geshel’ Rostov State University, ul. Zorge 7, Rostov-on-Don, 344090 Russia e-mail:
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, tel. 297-51-47 Received November 23, 2004 Abstract — A correlation between the effect of crown ether on the electrodeposition of a Cu–Cd alloy from perchlorate aqueous–ethanol baths and the liquid phase composition was found. The best inhibition by crown ether was found to occur in a range of the water structure stabilization by ethanol molecules (where the desalting effect of the mixed solvent ensures the maximum adsorption of additive molecules). An increase in the surface concentration of  anions, as well as in the size of discharging metal complexes (because of their selectivesolvation in ranges of partially loosened structure of the mixture and the ethanol structure stabilized by mono-mer water molecules), usually reduces the effectiveness of crown ether. Varying the composition of aqueousethanol solvent makes it possible to regulate the content of the electrochemically negative component in thealloy, thus affecting the tribotechnical characteristics of the resulting coatings.
20/09/2008 | 881 Hits | Print
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15.
Formation, Retention, and Waste of Products of the Atmospheric Corrosion of Metals. 3. Corrosion Losses and the Weight of Retained Products Yu. M. Panchenko and P. V. Strekalov Institute of Physical Chemistry, Russian Academy of Sciences, Leninskii pr. 31, Moscow, 119991 Russia e-mail:
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Received July 9, 2004 Abstract — The dependence m/K = f (K) (m is the weight of retained products per the unit weight of corrosion losses) on the integral weight of corrosion losses K, which is observed for zinc, carbon steel, copper, brass, aluminum, as well as  16 and   alloys, in cold, temperate, and tropical climates, is analyzed. Two groups of empirical equations are proposed to express the functional dependence m/K = f(K). The weight of retained products of outdoor corrosion on zinc, steel, aluminum, and copper, which was calculated from these equations, adequately agree with the experimental weights of products after 1-year outdoor tests of these metals carried out since the late 50s of the past century in Russia and China.
20/09/2008 | 883 Hits | Print
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16.
Comparative Analysis of Requirements to Insulating Coatings of Pipelines N. P. Glazov, K. L. Shamshetdinov, and N. N. Glazov Research Institute of Building and Service of TEK Objects “Institute VNIIST” e-mail:
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Received April 2, 2004 Abstract — Requirements to insulating coatings of pipelines, according to Russian and foreign standards are analyzed. It is shown that estimating the insulation quality by a degree of its damage does not meet the modern requirements to insulating coatings and causes significant overexpenditures for the cathodic protection.
20/09/2008 | 874 Hits | Print
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17.
Linear Regressions and Structural Correlations for Models of Stray-Current Circuits A. M. Kerimov, P. A. Spirin, and R. A. Kerimov Azerbaijani State Petroleum Academy, Azerbaijan Received April 23, 2005
20/09/2008 | 853 Hits | Print
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