Multilayer Protective Polymeric Coatings: Providing for Their Continuity

V. A. Golovin

Frumkin Institute of Physical Chemistry, Russian Academy of Sciences, Leninskii pr. 31, Moscow, 119991 Russia
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Received October 11, 2005

Abstract - It has been shown that, owing to the application of a multilayer design (construction) and the correct choice of technology and materials, the following results on enhancement of the continuity of polymeric protective coatings (PCs) may be achieved: (1) a reduction in the technological defectiveness to a preassigned level due to overlapping of flaws, even at a high specific defectiveness of the materials used in the PC layers; (2) an increase in the resistance to cracking of rigid PC layers and hard substrates because of the redistribution of internal stresses in the substrate–multilayer PC system; and (3) an enhancement in PC resistance to cracking on the opening-up of a crack in the substrate under tension or bending.

Comparative Study of the Corrosion Behavior of Platinum-Based Nanosized Cathodic Catalysts for Fuel Cells

M. R. Tarasevich, V. A. Bogdanovskaya, E. N. Loubnin, and L. A. Reznikova

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

Received May 10, 2006

Abstract — The corrosion behavior of nanosized catalysts, in particular, of the commercial platinum catalyst and of PtCo synthesized on a XC72 carbon black carrier, are compared. Using electrochemical and structural research methods, it is shown that, under comparable conditions of the corrosion treatment, the PtCo/C system is less liable to degradation caused by the dissolution or aggregation of the catalyst particles.

Chemical Processes during the Heat Treatment of Basalt Fibers

A. V. Knot’ko^{a, b}, A. V. Garshev^b, I. V. Davydova^b, V. I. Putlyaev^b,
V. K. Ivanov^a, and Yu. D. Tret’yakov^{a, b}

^a Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences,
Leninskii pr. 31, Moscow, 117907 Russia

^b Moscow State University, Department of Chemistry, Vorob’evy gory, Moscow, 119899 Russia

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Received November 21, 2006

Abstract — It has been established that, during the heat treatment of an unsubmixed (unsub-blended) glass (with the contents of Ca and Mg, corresponding to the natural basalt) at the first stage of the oxidation process, magnetic nanoparticles (>20 nm according to the transmission electron microscopy data) of (Mg, Fe)₃O₄ are formed in a nonmagnetic glassy matrix (that is, the oxidation proceeds as internal reaction), followed by the crystallization of alumosilicate phases. In the glasses enriched in CaO, such a crystallization occurs simultaneously with the evolution of the spinel phase. An analysis of the distribution of cations over the fiber cross section has demonstrated that annealing under oxidative conditions is conducive to an increase at the surface of fibers in the concentration of Ca in the case of utilizing an unsubmixed material and that of Na in the case of the glass with a higher content of CaO. The long-term annealing of the nanocomposite at the temperatures of its production results (according to the measurement data of magnetic properties) in the interaction of a part of the formed (Mg, Fe)₃O₄ with the alumosilicate matrix.

Composite Nonmetallic Reinforcement for Construction Structures

V. F. Stepanova^a, G. M. Krasovskaya^a, S. V. Shakhov^b, and V. V. Belenchuk^c

^a Research Institute of Reinforced Concrete, Moscow, Russia

^b OOO ASP, Perm’, Russia

^c OOO MBA-Proekt, Perm’, Russia
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Received January 10, 2006

Abstract — Advances in the use of fiberglass and basalt-plastic reinforcement are reviewed. Physical engineering and corrosion properties of basalt-plastic reinforcement produced according to different technologies are studied. Prospects for the use of composite nonmetallic reinforcement are outlined.

Microbiological Corrosion and Measures to Protect Against Such Corrosion Part VI. Corrosion of Copper in the Marine Atmosphere: A Technique¹

A. A. Gerasimenko, G. V. Matyusha, and L. M. Petrova

Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Moscow, Russia
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Received October 19, 2006

Abstract — A technique is developed to enable one to study in a sufficiently objective way the processes of the microbiological corrosion of copper and its alloys in the marine atmosphere. This technique is recommended for diagnosing and forecasting corrosion processes in real conditions for the storage and transportation of products.

Methods and Setups for Corrosion Testing in Moving Media and under Heat Exchange Conditions: 4. Crevice Corrosion¹

V. S. Pakhomov

Moscow State University of Engineering Ecology, Moscow, Russia

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Received March 28, 2006

Abstract — The possibilities offered by various setups for the investigation of crevice corrosion are considered. It is pointed out that the setups with rotating electrodes, despite their ability to create controlled hydrodynamic and heat exchange conditions, are not suited for studying crevice corrosion because of the forced removal of a medium from the crevice under the action of centrifugal forces. The design of a setup free of this disadvantage is proposed, which employs a combination of rotating and immobile disks.