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71.
The Anodic Behavior of Hydrogenated Copper in Sodium Hydroxide Solutions D. S. Sirota and A. P. Pchel’nikov Karpov Research Institute of Physical Chemistry (Russian State Scientific Center),
ul. Vorontsovo pole 10, Moscow, 103064 Russia e-mail:
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Received June 6, 2004 Abstract — The anodic behavior of cathodically hydrogenated copper in 1 N NaOH solution is investigated with the use of its free-corrosion chronopotentiometry (Ecor) and cyclic voltammetry (CVA). The former proves that while being cathodically hydrogenated, copper, unlike nickel, does not form hydride. An analysis of the CVAs shows that during anodic dissolution of hydrogenated copper, two forms of adsorbed hydrogen are ionized, while the ionization is limited by the diffusion in solid phase. Under the same hydrogenation conditions, copper sorbs ten times less hydrogen than nickel does.
30/09/2008 | 796 Посещения | Печать
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72.
Dissolution of Ni Zn Alloys in Sulfate Solutions V. V. Ekilik, A. G. Berezhnaya, and E. A. Tugolukova Rostov State University, ul. B. Sadovaya 105, Rostov-na-Donu, 344006 Russia e-mail:
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(8632) 22-59-47 Received February 2, 2004 Abstract — The anodic behavior of nickel, zinc, and their alloys with the zinc content from 30 to 90% in blank sulfate solutions and in the presence of quinolinium perchlorate derivatives is studied. For the mixed dissolution kinetics, the effect of additives in the stages of ionization and liquid- and solid-phase diffusion is elucidated. The inhibition coefficients of the process are shown to correlate with hydrophobicity constants of alkyl substituents in organic cations.
30/09/2008 | 906 Посещения | Печать
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73.
Effect of Viscosity on Lubricating and Protective Action of a Glassy Melt on Hot Rolling of 30    Steel O. R. Lazutkina1 , P. I. Buler2 , and N. V. Odegova1 1 Ural State Technical University, ul. Mira 19, Yekaterinburg, 620002 Russia 2 Erlangen–Nürnberg University Received April 30, 2004 Abstract — Variation of the viscosity of molten glasses xNa2O · yCaO · zB2O3 · nSiO2 in a temperature range of 1300–1700 K and the effect of the viscosity and Na2O content on the steel oxidation rate are considered.
30/09/2008 | 938 Посещения | Печать
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74.
Corrosion Damage to a Silver Coin  Sobol  I. G. Erusalimchik1 , M. N. Filippov2, and I. V. Murav’eva2 1 Moscow State Institute of Radio Engineering, Electronics, and Automatics (Technical University),
pr. Vernadskogo 78, Moscow, 117454 Russia e-mail:
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2 Moscow Institute of Steel and Alloys (Technological University), Leninskii pr. 4, Moscow, 117936 Russia e-mail:
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Received December 24, 2003 Abstract — The surface of a silver coin “Sobol’” is investigated by local x-ray fluorescence analysis and mea-suring the electrode potential. It is shown that the coin blackening is associated with the formation of silver sulfide Ag2S.
30/09/2008 | 923 Посещения | Печать
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75.
What is the Science? What Have People instead of, and Why Do We Need Corrosiology?1 V. M. Novakovskii Karpov Institute of Physical Chemistry, ul. Vorontsovo Pole 10, Moscow, 103064 Russia e-mail:
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Received November 18, 2003 Abstract — People need a science comprehending both their and its own destination, universal, far-seeing, harmonizing the whole biosphere, and preventing from mistakes. It was such a science, Ya.M. Kolotyrkin has dreamt about, and such was its own ancient trend. However,… Having substantially accelerated its development and pragmatized it, the industrial revolution split it into a handy set of narrow-seeing weakly bound branches, and thus deprived them of panoramic sight and ability to distinguish between the essence and illusion. At first sight, everything is OK (especially after the Scientific-technological revolution that has illusively conquered crises): the science finds mineral deposits, discovers the ways of and teaches how to make something of them, invents and develops everything that fills our everyday life, serves and substitutes for us in industry, joins the continents, and so on. But in essence… this is the shortest way to the hell for our children’s children. We do pave it ourselves by exhausting the mines and wells so as if the mineral resources, which were created by the Supreme Intelligence (by means of the numerous past biospheres for billions of years!), do not have a price that hundreds and thousands times exceeds the market cost of everything we produce of them. By means of a thorough analysis, unbreakable semantic definitions of the basic triad of scientific categories Life, Science, and Verity are clarified. As an example of the quality of theories that are still in use, absolutely feebleness of the S.Arrhenius concept of electrolytic dissociation (which has stopped the development of electrochemistry for more than a century) is shown. The reunion and closest cooperation between the science and Church is the last chance for the man to get the True Science and Life!
30/09/2008 | 1272 Посещения | Печать
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76.
Revealing the Nature and Number of Active Centers on Metal Surfaces with Electrochemical Scanning Tunnel Microscope1 E. V. Kasatkin State Scientific Center of the Russian Federation “Karpov Institute of Physical Chemistry,”
ul. Vorontsovo Pole 10, Moscow, 103064 Russia e-mail:
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Received February 9, 2004 Abstract — Measurements with scanning tunnel microscope are analyzed, as regards the relative number and properties of tunnel-active centers at metal surfaces (Pt single crystals, polycrystalline Rh, Pd, and Cu, highly oriented pyrolytic graphite, etc.), in particular, at controlled potential. The relative number and local properties of the tunnel-active sites, their tunnel conductance, and donor–acceptor properties are calculated. A tunnel exchange current observed, similar to the exchange current of electrochemical reactions, reflects reversible charge transfer across the interface showing equal rates of the forward and backward processes. A possible correlation between the tunnel and electrochemical stages of the charge transfer is discussed.
30/09/2008 | 1171 Посещения | Печать
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77.
Kinetics and Mechanism of the Gold Corrosion Dissolution in Hypochlorite Solutions L. F. Kozin*, V. A. Prokopenko**, and A. K. Bogdanova* * Vernadskii Institute of General and Inorganic Chemistry, National Academy of Sciences of Ukraine,
pr. Palladina 32-34, Kiev, 252142 Ukraine ** Ovcharenko Institute of Biocolloid Chemistry, National Academy of Sciences of Ukraine, Kiev, Ukraine Received April 23, 2001; in final form, July 1, 2004 Abstract — Kinetics and mechanism of the gold metal dissolution by means of corrosion in chloride–hypochlorite solutions are studied. The dependences of the dissolution rate on the solution pH, sodium hypochlorite concentration, and temperature are determined. Conditions of the gold passivation surface during its corrosion in the studied solutions are discussed. The first-order rate constants of the gold dissolution (ki = 0.079–0.4030 s–1) at temperatures from 277 to 304 K and others are calculated. The equilibrium constants of the dissolution reac-tions in acid and alkaline chloride–hypochlorite solutions are different: 1.2  106 and 2.39 102, respectively. The activation energy calculated from the temperature dependence of the rate constants (53.43 kJ/mol) evidences a kinetic control of the gold dissolution. Quantitative data on the composition of surface adsorption films, formed by oxidation gold dissolution products, are obtained using the Auger spectroscopy.
30/09/2008 | 1140 Посещения | Печать
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78.
Theory of Dissolution of Binary Alloys and the Tamman Rule A. I. Shcherbakov Institute of Physical Chemistry, Russian Academy of Sciences, Leninskii pr. 31, Moscow, 117071 Russia e-mail:
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Received March 17, 2003 Abstract — A model of the dissolution of binary alloys, taking into account the component interaction energy, is suggested. The partial rate constants, as well as the dissolution rate depend on the concentration stepwise, according to the formula n/Z where Z is the lattice’ coordination number. Using these dependences, transitive and steady-state equations of the alloys selective dissolution are derived.
30/09/2008 | 1159 Посещения | Печать
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79.
Exfoliation Corrosion of Aluminum Alloys and Their Protection by Coatings with Metal-filled Primers
V. S. Sinyavskii, V. D. Kalinin, V. M. Gladyshev, and T. Ya. Yakimova OAO All-Russian Institute of Light Alloys, ul. Gorbunova 2, Moscow, 121596 Russia e-mail:
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Received March 21, 2003 Abstract — Exfoliation corrosion (EC) is shown to represent a special type of stress corrosion which develops under the surface of aluminum high-alloyed alloys like  16 and  95  1. Protection against EC by using common paint coatings (PCs) is ineffective. Indoor tests demonstrate that EC can be almost completely suppressed by using PCs with zinc-filled primers (ZFPs). After 2-year tests in sea tropics, common PCs do not prevent the appearance and development of EC. At the same time, samples protected by PCs that involve ZFP EP 057 demonstrate the total absence of EC including bare surface areas up to 5 and even 10 mm wide where the coating has failed. Similar results are obtained in 6-year tests in north sea atmosphere. Potentiodynamic studies of different protection schemes confirm the electrochemical protection mechanism of aluminum alloys against EC by using ZFPs. It is shown that ZFPs can also be used during maintenance works. The advantages of metal-filled primers based on polyurethane over those based on epoxy resin are shown.
30/09/2008 | 1223 Посещения | Печать
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80.
The Effect of Sorbed Hydrogen on the Corrosion Potential of Iron in Acidic Sulfate Solutions T. A. Nenasheva and A. I. Marshakov Institute of Physical Chemistry, Russian Academy of Sciences, Leninskii pr. 31, Moscow, 117071 Russia e-mail:
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Received June 26, 2003 Abstract — By using a bipolar electrode, i.e., a membrane, it is shown that hydrogen absorbed by a metal does not virtually affect the cathodic evolution of hydrogen. The change in the iron corrosion potential is determined by the effect of sorbed hydrogen on the anodic process.
30/09/2008 | 1211 Посещения | Печать
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