ISSN 2305-6894

2012, Vol. 1, Issue 2 (pp. 80-153)

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Control of the inhibiting capability of a spiropyran in anodic dissolution of lead in water–acetonitrile environment by light flux

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Southern Federal University, ul. Zorge 7, Rostov-on-Don, 344090 Russian Federation

Abstract: It has been found that the inhibiting effect of a spiropyran is enhanced under illumination and that this enhancement increases with the spiropyran concentration. The anodic dissolution of lead and cathodic reduction of films in water–acetonitrile media has been studied as a function of electrolyte nature and water content. It has been determined that the passive state of lead starts before the corrosion potential and changes to local depassivation, while water has an activating effect.

Int. J. Corros. Scale Inhib., , 2, 80-85 PDF (677 K)
doi: 10.17675/2305-6894-2012-1-2-080-085

Regularities of the residual protective effect of the o-hydroxyazomethine reaction series toward aluminum corrosion in 1 M H2SO4

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1 Southern Federal University, ul. Zorge 7, Rostov-on-Don, 344090 Russian Federation
2 Research Institute of Physical and Organic Chemistry at Southern Federal University, pr. Stachki 94/3, 344104 Rostov-on-Don, Russian Federation

Abstract:

The regularities of changes in the residual protective effect of o-hydroxyazomethine derivatives on the acid corrosion of Al have been studied. The duration of the residual protective effect (τ) is a function of the polarity of substituents in o-hydroxyazomethine molecules, inverse temperature of the solution, and the additive concentration in the pre-adsorption solution. The identified regularities of the effect of these factors on τ is interpreted in terms of the Linear Free Energy Relationship approach. The changes in the near-electrode concentration of a desorbed inhibitor as a function of time and solution temperature are discussed. It is noted that the effects of various factors on the regularities of changes in the residual protective effect of o-hydroxyazomethine derivatives toward Al and Fe corrosion are similar.

Int. J. Corros. Scale Inhib., , 2, 86-98 PDF (1 088 K)
doi: 10.17675/2305-6894-2012-1-2-086-098

Volatile inhibitors of atmospheric corrosion of ferrous and nonferrous metals II. Prediction of the efficiency of volatile inhibitors of atmospheric corrosion of steel (with Schiff and Mannich bases as examples)

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All-Russia Research Institute of Petrochemical Processes, ul. Pulkovskaya 10, St. Petersburg, 192148 Russian Federation

Abstract: The relationship between the physicochemical properties of compounds and their inhibition factors g of the atmospheric corrosion of steel are discussed with Schiff and Mannich bases as examples. It is shown that the inhibitive efficiency of compounds can be predicted from correlations between g and calculated parameters such as saturated vapor pressure, total electron density on heteroatoms, and hydrophobicity constant. The predicted and experimental inhibition factors of new inhibitors agree to within ±10%.

Int. J. Corros. Scale Inhib., , 2, 99-106 PDF (564 K)
doi: 10.17675/2305-6894-2012-1-2-099-106

XPS study of 5-chloro-1,2,3-benzotriazole adsorption on nickel surface

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1 A. N. Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Leninskii pr. 31, Moscow, 119071 Russian Federation
2 . N. Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Leninskii pr. 31, Moscow, 119071 Russian Federation

Abstract: Surface layers formed by adsorption of 5-chloro-1,2,3-benzotriazole (5-chloroBTA) on nickel and influence of pH of borate buffer solution and electrode potential on formation multicomponent oxidized films on nickel were studied by XPS. It was found that at concentration of 10–4 mol/l in neutral borate solutions a 0.7 nm monomolecular layer of 5-chloroBTA is formed. Using peak intensity angular dependence of XPS spectra the orientation of 5-chloroBTA close to vertical on nickel hydroxide formed on the nickel surface was shown. 5-ChloroBTA forms a chemical bond by lone pair of nitrogen and surface nickel cations.

Int. J. Corros. Scale Inhib., , 2, 107-116 PDF (1 036 K)
doi: 10.17675/2305-6894-2012-1-2-107-116

Inhibition of hydrogen sulfide corrosion of steel by volatile amines

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1 GAZPROM VNIIGAZ, POB 130, Moscow, 115583 Russian Federation
2 A. N. Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Leninskii pr. 31, Moscow, 119071 Russian Federation

Abstract: The protective effect of amines on steel corrosion under simulated conditions of gas condensate fields are studied. It is shown that primary amines are less effective than secondary and tertiary ones in terms of steel protection, especially in vapor phase. The authors also studied the impact of CH2S, pH, temperature and presence of a hydrocarbon phase on protective effect of chemical compounds considered.

Int. J. Corros. Scale Inhib., , 2, 117-129 PDF (782 K)
doi: 10.17675/2305-6894-2012-1-2-117-129

Laboratory assessment of corrosion inhibitors efficiency at oilfield pipelines of West Siberia region II. Tests in a U-cell

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1 OJSC Transenergostroi, Derbenevskaya nab. 7, bldg. 10, Moscow, 115114 Russian Federation
2 A. N. Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Leninskii pr. 31, Moscow, 119071 Russian Federation

Abstract: This paper is a continuation of a series of publications related to laboratory assessment of the performance of carbon dioxide corrosion inhibitors for oilfield pipelines in the West Siberian region. The test results obtained in U-shaped glass cells are considered. The effects of temperature, carbon dioxide content, test duration, specimen surface condition, presence and volume of a hydrocarbon phase, and inhibitor concentration on the corrosion kinetics and protective properties of a wide range of industrial inhibitors are analyzed. Recommendations are given on specific inhibitor test conditions to be used for assessment of inhibitor suitability for the protection of water pipelines and oil pipelines with low watercut.

Int. J. Corros. Scale Inhib., , 2, 130-145 PDF (1 649 K)
doi: 10.17675/2305-6894-2012-1-2-130-145

Volatile inhibitors of metal corrosion II. Interaction of systems being protected with the environment and corrosion prevention conditions

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A. N. Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Leninskii pr. 31, Moscow, 119071 Russian Federation

Abstract: This paper is a continuation of a series of publications dealing with the protection of metals by volatile corrosion inhibitors (VCIs). It presents a review on the propagation of VCI vapors, VCI distribution in the volume being protected, and specifics of vapor-phase protection of isolated systems and systems interacting with the environment in various ways. The review is supplemented by the authors’ own theoretical materials.

Int. J. Corros. Scale Inhib., , 2, 146-153 PDF (692 K)
doi: 10.17675/2305-6894-2012-1-2-146-153

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