ISSN 2305-6894

2013, Vol. 2, Issue 1 (pp. 1–81)

Antagonism of organic and inorganic activators in copper local depassivation in alkaline solutions

      • E.A. Skrypnikova,1 S.A. Kaluzhina,2 E.V. Orlova3 and L.N. Volkova2
1MESC Air Force Military Air Academy named after N. E. Zhukovsky and Yu. A. Gagarin, ul. Staryh bolshevikov 54a, Voronezh, 394000 Russian Federation
2Voronezh State University, Universitetskaya pl. 1, Voronezh, 394006 Russian Federation
3N. N. Burdenko Voronezh State Medical Academy, Studencheskaya ul. 10, Voronezh, 394036 Russian Federation

Abstract: The local depassivation of copper in alkaline medium (pH = 12) in the presence of organic activators (glycine, α-alanine, β-alanine) simultaneously with inorganic ones (NaCl) was studied. The studies were carried out in background electrolytes: 1·10–2 M NaOH + 5·10–3 M Gly, 1·10–2 M NaOH + 5·10–3 M α-Ala, and 1·10–2 M NaOH + 1·10–2 M β-Ala. The concentration of the additive (NaCl) in the working electrolyte was varied in a wide range from 1·10–6 to 1·10–1 M. It was found that NaCl can affect the intensity of copper local depassivation in two ways. At inorganic additive concentrations in the range of 1·10–6–1·10–4 M, significant suppression of the depassivation process occurs, which changes to acceleration in the NaCl concentration range of 1·10–4–1·10–1 M. An explanation of the observed effects was suggested from the viewpoint of competitive adsorption, nucleophilic substitution and complexing theories for particles present in the systems being studied.

Int. J. Corros. Scale Inhib., 2013, 2, 1-8 (PDF 1121 K)
doi: 10.17675/2305-6894-2013-2-1-001-008

 

Volatile inhibitors of atmospheric corrosion of ferrous
and nonferrous metals. III. VNKh-L-408 inhibitor: basics of production and application technology

      • A.I. Altsybeeva, V.V. Burlov, N.S. Fedorova, and T.M. Kuzinova
All-Russia Research Institute of Petrochemical Processes, ul. Pulkovskaya 10, St. Petersburg, 192148 Russian Federation

Abstract: Criteria for selection of inhibitors based on their metal corrosion inhibition factors in an environmental chamber have been proposed. It has been demonstrated that a wide range of ferrous and nonferrous metals are efficiently protected by 1-(morpholino)(phenyl)methylbenzotriazole conventionally named as VNKh-L-408. The basics of its production and application technology have been developed.

Int. J. Corros. Scale Inhib., 2013, 2, 9-16 (PDF 513 K)
doi: 10.17675/2305-6894-2013-2-1-009-016

 

Laboratory assessment of corrosion inhibitors effectiveness
at oilfield pipelines of West Siberian region. III. Bubble test

      • N. N. Andreev,1 N. G. Anufriev,1 and I. S. Sivokon2
1A. N. Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Leninskii pr. 31, Moscow, 119071 Russian Federation
2OJSC Transenergostroi, Derbenevskaya nab. 7, bldg. 10, Moscow, 115114 Russian Federation

Abstract: This article continues a series of publications dedicated to lab assessment of carbon dioxide corrosion inhibitors efficiency at the oilfield pipelines of West Siberian region. Results of the bubble test are reviewed. The effect of temperature, test duration, condition of the specimen surface, the presence of a hydrocarbon phase, and concentration of inhibitors on corrosion rate and protective properties of a wide range of commercial inhibitors are analyzed. Recommendations on specific test conditions to assess the applicability of inhibitors for protection of water lines and oil pipelines with low watercut are given.

Int. J. Corros. Scale Inhib., 2013, 2, 17-29 (PDF 867 K)
doi: 10.17675/2305-6894-2013-2-1-017-029

 

Inhibition of bismuth dissolution in 0.1 M sodium chloride solution

      • V. V. Ekilik, E. A. Korsakova and A. G. Berezhnaya
Southern Federal University, ul. Zorge 7, Rostov-on-Don, 344090 Russian Federation

Abstract: Some organic compounds were studied as inhibitors of bismuth dissolution in passive state and under depassivation conditions in 0.1 M sodium chloride solution. The relationship between the effects of the organic additive and the Cl ion was estimated. Information about the influence of additives on the rate-limiting step under potentiostatic polarization was obtained.

Int. J. Corros. Scale Inhib., 2013, 2, 30-38 (PDF 655 K)
doi: 10.17675/2305-6894-2013-2-1-030-038

 

Volatile inhibitors of atmospheric corrosion. III. Principles and methods of efficiency estimation

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

Abstract: This paper continues the analytical literature review on the theory and practice of metal protection by volatile corrosion inhibitors (VCI) supplemented by our own data. The principles and methods for fast estimation of VCI efficiency are reviewed.

Int. J. Corros. Scale Inhib., 2013, 2, 39-52 (PDF 748 K)
doi: 10.17675/2305-6894-2013-2-1-039-052

 

Effect of IFKhAN-92 inhibitor on electrode reactions and corrosion of mild steels in hydrochloric and sulfuric acid solutions

      • Ya. G. Avdeev and A. Yu. Luchkin
A. N. Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Leninskii pr. 31, Moscow, 119071 Russian Federation

Abstract: Studies on the effect of inhibitor formulations based on IFKhAN-92 on the electrode reactions of mild steel in hydrochloric and sulfuric acid solutions have shown that these formulations considerably hinder the cathodic and anodic reactions on the metal at temperatures at least up to 100°C. This result allowed us to assume that it is possible to slow down steel corrosion efficiently by formulations based on IFKhAN-92 not only below 100°C but also at higher temperatures, as confirmed by corrosion tests in hydrochloric acid (up to 160°C) and sulfuric acid (up to 200°C).

Int. J. Corros. Scale Inhib., 2013, 2, 53-66 (PDF 926 K)
doi: 10.17675/2305-6894-2013-2-1-053-066

 

Effect of molybdenum and tungsten polyoxometalates on the composition of surface layers and electrochemical behavior of stainless steel in sulfuric acid

      • L. P. Kazansky*, Yu. E. Pronin, E. M. Sokolova and S. S. Veselyi
A. N. Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Leninskii pr. 31, Moscow, 119071 Russian Federation

Abstract: The composition and thickness of the surface layers formed on ferrite steel at various applied potentials in pure 1 N H2SO4 and in the presence of polyoxometalate (POM) anions (PMo12O403-, Mo8O264- and PW12O403-) have been studied by XPS. Noticeable changes in cationic composition are observed near the passivation potential. At anodic potentials the surface oxide layer is enriched by chromium oxide. The thickness of this layer does not exceed 2–3 nm. If polymolybdate or polytungstate anions are added to sulfuric acid, they are located mostly in the uppermost oxide layer. The anodic currents decrease notably with an increase in POM concentration. At the passivation potential the oxide layer thickness exceeds 3–4 nm and it is substantially enriched by molybdenum. On the samples kept for 1 h in 1 N H2SO4, a protective layer is formed in the presence of POM and an after-affect is achieved. This layer remains stable upon transfer into pure 1 N H2SO4, especially in the case of PMo12O403-. The stronger protective properties of PMo12O403- are assumed to be due to its redox properties..

Int. J. Corros. Scale Inhib., 2013, 2, 67-81 (PDF 980 K)
doi: 10.17675/2305-6894-2013-2-1-067-081