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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 11 - 17 of 17
11.

The Effect of Complexing on the Zinc Dissolution in Dichromic Acid with HF Additions

A. M. Shcherbakov

 

Zhitomir Pedagogical University, ul. B. Berdichevskaya 40, Zhitomir, 10008 Ukraine

Received December 17, 2003

 

Abstract — Two concentration ranges of activating hydrofluoric acid additions were distinguished when dis-solving zinc in a 2.5 M CrO3 solution. Zinc dissolves slowly in a range of 0.05 to 0.3 and quickly from 0.4 to  mol/l HF. The effect is explained by the involvement of F ions in the formation of Cr(III) fluoride complexes during the reduction of dichromic acid anions and ZnF+ cations during zinc ionization. Ionic equilibrium was calculated after long-term holding zinc in the CrO3 solutions with various HF contents. It was shown that com-plexing hinders the growth of passive oxide and salt films based on ZnF2 or basic Cr(III) chromate on zinc.

 

DOI: 10.1134/S0033173206030118
18/09/2008 | 843 Hits | Print

12.

Corrosion Resistance of Titanium with Diffusion Carboxide Coatings

S. V. Guryn, I. N. Pogrelyuk, V. N. Fedirko, and I. V. Dyug

 

Karpenko Physical and Mechanical Institute, Ukrainian National Academy of Sciences,
ul. Naukova 5, Lvov, 79601 Ukraine

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Received February 15, 2005

 

Abstract — Corrosion and electrochemical properties of diffusion coatings on titanium formed by saturating from the carbon–oxygen-containing medium in aqueous 80% sulfuric acid solutions are studied. It is found that morphology of diffusion coatings affects the protective properties of titanium. It is shown that in extra-corrosive sulfuric-acid media carboxide coatings provide titanium with high protective properties, which exceed the corrosion resistance of carbide and oxide coatings.

DOI: 10.1134/S003317320603012X
18/09/2008 | 1015 Hits | Print

13.

Electrodeposition and Physico-Mechanical Properties of Chromium Coatings Modified with Disperse Particles

E. G. Vinokurova, A. M. Arsenkinb, K. V. Grigorovichb, and V. V. Bondar’c

 

a Mendeleev University of Chemical Technology,
Miusskaya pl. 9, Moscow, 125047 Russia

b Baikov Institute of Metallurgy, Russian Academy of Sciences,
Leninskii pr. 49, Moscow, 117047 Russia

c All-Russian Institute of Scientific and Technical Information,
Russian Academy of Sciences, Moscow, Russia

Received June 25, 2004

 

Abstract — Chromium electroplates from Cr(III)-baths modified with disperse phases of CeO2 , Cr2O3 , graphite, and ultradisperse diamond are studied. Mechanical properties of the composite coatings are investigated. The Cr2O3-particles present in the bath are found to cause the destruction of the coatings already during the plating. When modifying with CeO2-particles, good coatings with enhanced microhardness can be obtained at their concentration in the bath of no more than 15 g/l. The deposition rate in such cases exceeds that in the blank baths. The optimum range of the CeO2-particle concentration, allowing to obtain the maximal microhardness, is 5–8 g/l. The self-lubricating chromium–graphite composite coatings can be deposited at a graphite concentration in the bath of up to 4 g/l. The microhardness of the chromium coatings is most strongly affected by ultradisperse diamond particles that increase the microhardness by a factor of 1.4; they also decrease the coatings’ brittleness. When the ultradisperse diamond concentration in the solution is as high as 30 g/l, the diamond content in the composite coating reaches its limiting value of 12–14 vol % (or 6.4–7.2 wt %). The optimum ultradisperse diamond concentration was found to be 17 g/l in the baths and 10.5 vol % (or 5.6 wt %) in the composite coating. At these concentrations, the coatings with the maximum microhardness and lowest brittle-ness are obtained.

 

DOI: 10.1134/S0033173206030131
18/09/2008 | 972 Hits | Print

14.

Solvent Activity and Its Vapor Pressure over a Nonvolatile Substance Solution

R. R. Salem

 

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Received March 16, 2005

DOI: 10.1134/S0033173206030143
18/09/2008 | 878 Hits | Print

15.

On the Asymptotic Growth of Evaporating Scale

I. G. Nakhutsrishvili and A. Z. Adamiya

 

Received April 4, 2005

DOI: 10.1134/S0033173206030155
18/09/2008 | 926 Hits | Print

16.

Corrosion Resistance of Zambian Silver Coin from the frame0African Wildlifeframe1 Series

I. G. Erusalimchika, M. N. Filippovb, and I. V. Murav’evab

 

a Moscow Institute of Radio Engineering, Electronics, and Automatic Control (Technical University),
pr. Vernadskogo 78, Moscow, 117454 Russia

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b Moscow State Institute of Steel and Alloys (Technological University),
Leninskii pr. 4, Moscow, 119049 Russia

Received September 11, 2005

 

Abstract — The surface of Zambian silver coin from the “African Wildlife” series is studied by local X-ray fluorescent analysis, mass-spectrometry, and electrode potential measurements. High purity of the coin metal is pointed out. Faint yellow tarnish at some spots on the surface is caused by local contamination during the coin production or storage.

DOI: 10.1134/S0033173206030167
18/09/2008 | 909 Hits | Print

17.

The Effect of Disinfecting Agents on the Contact Corrosion of Medical Instruments

E. K. Sevidova, I. D. Roi, and I. I. Stepanova

 

National Technical University “Kharkov Polytechnical Institute,”
ul. Frunze 21, Kharkov, 61002 Ukraine

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Received July 17, 2003

 

Abstract — The contacts of a tin–lead solder (frame0OC 61) with copper, brass and nickel in various types of disinfectants are investigated as galvanic couples where the solder always functions as the anode. The maximum relative increase in the corrosion rate is observed in a weakly alkaline hembar solution (guanidine-based biocidic polymer compound). The active oxidizers contained in delaxon and chlorantoin solutions can decompose due to their reduction at the cathodes of the couples.

 

DOI: 10.1134/S0033173206030179
18/09/2008 | 821 Hits | Print

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