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(11/10) Ученые из ИФХЭ РАН и МГУ под руководством Ольги Виноградовой поняли, как «полосатая» гидрофобность..
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(11/10) Ученые обнаружили пути проникновения вирусов гриппа и ВИЧ в организм
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(17/04) Курс “Анализ геномных данных”, Москва, 2 – 11 июля 2012
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(12/03) Впервые получено изображение атомов, движущихся в молекуле
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Results 21 - 27 of 27
21.

Some Features of the Local Depassivation of Binary Alloys

Yu. I. Kuznetsov* and M. V. Rylkina**

 

* Institute of Physical Chemistry, Russian Academy of Sciences, Leninskii pr. 31, Moscow, 119991 Russia

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** Udmurt State University, Universitetskaya ul. 1, Izhevsk, 426034 Russia

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Received December 19, 2003

 

Abstract — Pitting resistances of Fe–Cr, Fe–Ni, Fe–B, Cu–Ni, and Cu–Zn binary alloys were studied. The effects of the composition and protective properties of a passive film, the phase composition of the alloy, and the nature and concentration of an activating anion were analyzed. It was demonstrated that the basic concepts of complexation are applicable to the depassivation of binary alloys in aqueous solutions.
15/12/2008 | 1248 Hits | Print

22.

Cooperative Effects in the Problem of Acid Corrosion of Metals

M. A. Pletnev and S. M. Reshetnikov

 

Udmurt State University, Universitetskaya ul. 1, Izhevsk, 426034 Russia

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Received December 11, 2003

 

Abstract — The phenomenon of acid corrosion of metals is analyzed with consideration of the cooperative nature of the proton subsystem of aqueous acid electrolytes and the electronic subsystem of a metal. The necessity of studying the cathodic evolution of hydrogen in terms of solvent reorganization is justified. The concepts of the anodic dissolution of iron metals are reviewed retrospectively. An important role of the solvation of dissolved metal ions in the anodic dissolution is shown. The limiting currents of the kinetic nature at high anodic overpotentials are discussed in terms of the dynamics of atomic steps and the motion of dissolution solitons.
15/12/2008 | 1239 Hits | Print

23.

Peculiarities of the Corrosion Protection of Steel Underground Pipelines

N. P. Glazov

Scientific-Research Institute on Construction and Operation of Heat-power Objects Ltd VNIIST,
Okruzhnoi pr. 19, Moscow, 105187 Russia

e-mail: cpkz@ mail.ru

Received March 1, 2004

 

Abstract — The topics of enhancing the corrosion protection efficiency of pipelines are examined. Improuving the quality of the protective coatings enables one to preclude corrosion under the disbonded insulation, as well as the stress corrosion cracking, but causes the increase in the stray-current corrosion and other undesirable effects that are easily removed with the aid of electrochemical protection. Checking the insulation of pipelines upon completed construction by cathodic polarization ensures the reproducibility of the design parameters of the cathodic protection. The topics of the influence of insulating components, as well as protective and anodic groundings, on the effectiveness of corrosion protection are considered.
15/12/2008 | 1404 Hits | Print

24.

Estimation of Pitting Resistance of Stainless Steels in Chloride-Containing Media of Pharmacochemical Industry

K. R. Tarantseva* and V. S. Pakhomov**

 

* Penza State Engineering Academy, pr. Baidukova 1-a, Penza, 440605 Russia

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** Moscow State University of Engineering Ecology, Moscow, Russia

Received March 5, 2004
15/12/2008 | 1532 Hits | Print

25.

On the Mechanism of Intergranular Corrosion of Aluminum Alloys

V. S. Sinyavskii, V. V. Ulanova, and V. D. Kalinin

 

OAO All-Russian Institute of Light Alloys, ul. Gorbunova 2, Moscow, 121596 Russia

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Received November 28, 2003

 

Abstract — It is found that intergranular corrosion can proceed on aluminum alloys in either of two forms. The first is characteristic of low-alloy or pure aluminum; it is called crystallographic and is controlled by recrystallization process. High-angle boundaries of growing recrystallized grains accumulate numerous vacancies which partly coagulate. This causes thermodynamical instability of the boundaries, and their electrode potential approaches the potential of active corrosion. The second form characteristic of medium- or high-alloy alumi-num is called structure-decomposition and is controlled by peculiarities of the decomposition of supersaturated solid solutions.
15/12/2008 | 1403 Hits | Print

26.

Post-Service Electrochemical Testing of Alloy Structure

V. Yu. Vasil’ev, V. S. Shapkin, and Yu. A. Pustov

 

Moscow State Institute of Steel and Alloys (Engineering University),
Leninskii pr. 4, Moscow, 119991 Russia

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Received March 19, 2004

 

Abstract — Alloy of a frame016frame1frame2 type is electrochemically studied after a service or laboratory loading simulating conditions of airplane flight. The effect of loading on the polarization current was revealed. The change in the electrochemical behavior was related to structure transformations and segregation in the alloy. Diagnostic electrochemical criteria of the precriticality state of titanium alloys and steel articles were determined.
15/12/2008 | 1562 Hits | Print

27.

High-Temperature Corrosion of Nickel Alloy TsNK7P with a Protective Aluminide Coating

A. M. Smyslov*, R. R. Nev’yantseva*, A. A. Bybin**, and E. V. Parfenov*

 

* Ufa State Aviation Technical University, Ufa, Bashkortostan, Russia

** Federal State Unitary Enterprise NPP Motor, ul. Sel’skaya Bogorodskaya 2, Ufa, 450039 Russia

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Received September 24, 2003

 

Abstract—Comprehensive studies aimed at developing a procedure for accelerated corrosion tests and investigating the high-temperature gas corrosion of a nickel alloy TsNK7P with an aluminosilicide coating were carried out. The kinetics and peculiar properties of the corrosion process were studied.
15/12/2008 | 1489 Hits | Print

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