The Radiation Oxidation of Aluminum in Contact with Water

N. N. Gadzhieva

Institute of Radiation Problems, Azerbaijan National Academy of Sciences,
pr. G. Dzhavida 31a, Baku, AZ 1143 Azerbaijan;
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Received October 10, 2005

Abstract — The aluminum oxidation in the aluminum–water system under the action of radiation is studied using the radiothermoluminescence and IR-reflection absorption spectroscopy methods. The specific features of the radiothermoluminescence peaks observed in a 100–250 K temperature range (the activation energy E_a = 0.38–0.65 eV) corroborate the significance role of superficial oxygen hole-type centers and chemisorbed oxygen in the oxide film formation. Based on the dose dependence of the chemisorbed oxygen thermal quenching, the kinetics of aluminum radiative oxidation and its chemisorptive passivation are revealed. The oxide film formation and the heterogeneity of its structure are traced using the IR-reflection spectra. A possible scheme of the radiation oxidation of aluminum in the aluminum–water system is suggested.

PACS numbers: 81.45.Bb

DOI: 10.1134/S003317320704011X

Electrodeposition of NickelFullerene C₆₀ Composition Coatings

V. N. Tseluikin, N. D. Solov’eva, and I. F. Gun’kin

Engel’s Technological Institute (Branch) of Saratov State Technical University,
pl. Svobody 17, Engel’s, Saratov oblast, 413100 Russia

Received March 28, 2006

Abstract — A method of preparing composition electrodeposits (CED) nickel–fullerene C₆₀ is proposed. The kinetics of electrodeposition of CED under potentiostatic conditions and the deposit structure are studied. It is shown that fullerene species are hydrogenated during the deposition. The corrosion and electrochemical behavior of CED in 0.5 M H₂SO₄ is studied.

PACS numbers: 73.61.Wp, 81.15.Pq, 82.45.Yz

DOI: 10.1134/S0033173207040121

Corrosion Inhibitors in Conversion Coatings. IV

S. V. Oleinik and Yu. I. Kuznetsov

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

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Received July 31, 2006

Abstract — This review covers main approaches to development of inhibited conversion formulations for chemical oxidation of aluminum alloys. A mechanism explaining the formation of conversion coatings on aluminum alloys from chromate conversion baths is proposed; the protective properties of the resulting coatings are characterized. It is demonstrated that various modified methods for the preparation of chromate conversion coatings on aluminum enhance their protective properties, however, without solving ecological problems. Among alternative corrosion inhibitors used in chemical oxidation of aluminum alloys, molybdate-containing formulations are worth noting and have been much investigated. The most promising approach is to develop corrosion inhibitors for use during both the formation of a conversion coating and its subsequent filling with compounds chemisorbable at the modified oxide.

PACS numbers: 82.45.Bb

DOI: 10.1134/S0033173207040133

Applying a Theory of Generalized Variables to Electrochemical Kinetics: Interpreting the Results of Studying Chromium Deposition from Cr(III) Baths

V. S. Protsenko, T. E. Butyrina, and F. I. Danilov

Ukrainian State Chemicotechnological University, pr. Gagarina 8, Dnepropetrovsk, 320640, Ukraine

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Received April 23, 2005

Abstract — By using the theory of generalized variables (the similarity theory and dimensional analysis), universal system of dimensionless complexes (the similarity criteria) is derived, which allows describing the kinetics of multistage reaction (metal electrodeposition at rotating disc electrode). The proposed mathematical apparatus can be flexibly adapted to describing the kinetics of virtually any complicated electrochemical system. The dimensionless complexes derived are used in interpreting the results of our studies on the chromium electrodeposition from Cr(III) oxalate and formate salt solutions at a rotating disc electrode. Possible mechanism of the electrodeposition from the oxalate and formate electrolytes is offered.

PACS numbers: 81.15.Pq; 82.20.Le

DOI: 10.1134/S0033173207040145

An Improved Grey Model for Corrosion Prediction of Tank Bottom¹

S. M. Liu and G. Y. Zhang

Institute of Soil Science, Chinese Academy of Sciences, Nanjing, 210008 China

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Received December 17, 2006

Abstract — Leakage of a storage tank caused by the corrosion of its bottom contaminates soils and underground waters. The tank operators must monitor and control the underground corrosion of the tank bottom. Though it is difficult to observe the underground corrosion of a tank bottom, the corrosion depth progress can be predicted by forecasting models. An improved first-order one-variable grey prediction model (IGM (1, 1) model) was proposed for the corrosion prediction of the tank bottom. The IGM model used the synthesizing grey correlation degree as weights to modify the results from GM (1, 1) models based on long and short son data sequence from the identical original data. The IGM model was applied to simulate the corrosion depth progress of a tank bottom from 1994 to 1999. Results showed the IGM dynamic model be more precise than the existing GM (1, 1) one. It is an effective tool to predicting the tank bottom corrosion. The corrosion depth values of tank bottom from 2000 to 2001 were well predicted.

PACS numbers: 81.15.-z

DOI: 10.1134/S0033173207040157