Estimate of Contributions of Polysulfide Film and Inhibitor to the Protection of Steel from Hydrogen-Sulfide Corrosion

V. I. Vigdorovich^a and S. A. Zakurnaev^b

^a Tambov State Technical University, Tambov, Russia

^b Tambov State University, Tambov, Russia

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Received October 28, 2008

Abstract — A method for estimating the contributions of film formed on a corrosive surface in aggressive medium favoring its formation and INKORGAS-T30 inhibitor at the inhibition of corrosion in steel has been proposed. Experimental results obtained by studying the behavior of the St3 carbon steel in mineralized chloride medium (5 wt % NaCl) containing 50–400 mg/l H₂S and the addition of an inhibitor have been presented. Using the polarization resistance method, the protective efficacy of oxide and polysulfide surface films and an inhibitor has been estimated as a function of the duration of the action of the aggressive medium, hydrogen sulfide concentration, and the corrosion inhibitor.

Protective Nonchromate Conversion Coatings on AD-31-Type Alloy

S. V. Oleinik and Yu. M. Zimina

Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Moscow, Russia

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Received April 21, 2008

Abstract — It is shown that the repeated use of the conversion solution IFKhANAL-1 allows one to obtain protective conversion coatings (CCs) on the alloy AD-31 with protective properties that are no worse than those of chromate coatings. The influence of preliminary thermal treatment on the protective properties of CCs is studied. The possibility to considerably increase the corrosion stability of CCs by filling them in the inhibitor IFKhAN-25 solution is shown.

The Influence of Zinc Cations on Steel Oxidation in Nitrate Solutions

D. B. Vershok, D. S. Bulgakov, Yu. I. Kuznetsov, T. V. Rybkina, and R. Kh. Zalavutdinov

Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Moscow, 119991 Russia

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Abstract — The influence of zinc nitrate additives on the protective properties of the magnetite coating (MC) obtained by the oxidation of low-carbon steel in the nitrate solution at temperatures of 96–98°C has been studied by physical, electrochemical, and corrosion methods. It has been shown that, under these conditions, iron zinc spinel ZnFeO₄, which is introduced into an MC, can be formed. Low concentrations ( = 25150mg/l) of it increase the corrosion stability of steel with MC in water containing chlorides and sulfates and also at the periodic moisture condensation of the sample surface. At > 500 mg/l, MC formation stops.

Cyclic Durability of D16T Alloy Covered with Anodic and Microplasmous Coatings

E. N. Kutyreva, A. V. Dub, and A. G. Rakoch

Moscow State Institute of Steel and Alloys, Leninskii pr. 4, Moscow, 119991 Russia

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Received November 6, 2008

Abstract — Corrosion-protective properties of the anodic and microplasmous D16T alloy coatings obtained according to the previously developed techniques in two variants, namely, with and without the addition of polyurethane filler, which was saturated with a metallic powder, are studied. The effect of the coatings on the cyclic durability of the alloy is estimated. Microplasmous coatings with or without the filler are found to be effective on items made of D16T alloy because they increase the cyclic durability and the corrosion resistance of the alloy.

Hard Corrosion-Resistant Coatings for Constructional Applications

Yu. V. Lakhotkin, V. P. Kuzmin, and V. L. Goncharov

Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Moscow, Russia

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Abstract—This is an overview of modern methods used to harden metal products. Capabilities and drawbacks of each method are analyzed with respect to requirements imposed on coatings intended for use in precision engineering. A fundamentally new approach to the creation of nanostructured hardening layers at low temperatures has been proposed. Three classes of tungsten carbide coatings that mutually differ by the combination of their microhardness, viscosity, and thickness have been described. Some physicochemical features of the synthesis of tungsten carbide compounds, their structure, and their mechanical properties have been established. According to tribological tests, the abrasive resistance of tungsten semicarbide is almost twice as high as the abrasive resistance of the VK-6 hard alloy. The absolute abrasive wear resistance of the carbide coating in the presence of a lubricant is ten times higher than that of the hard alloy. Particular applications of the tungsten carbide coatings and their advantages over commercially available materials and coatings have been described.

Simultaneous Phosphatizing of Steel, Galvanized Steel, and Aluminum

D. V. Mazurova^a, N. S. Grigoryan^a, E. F. Akimova^b, A. A. Abrashov^a,  T. A. Vagramyan^a, and V. I. Kharlamov^a

^a Mendeleev University of Chemical Technology, Miusskaya pl. 9, Moscow, 125190 Russia

^b Scientific Research Institute of Paint Coatings with Pilot Victoria Machine-Building Plant,
Khot’kovo, Moscow Region, Russia

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Received November 17, 2008

Abstract — A phosphatizing solution is developed for the joint treatment of steel, galvanized steel, and aluminum that allows one to obtain adhesion crystalline phosphate layers (with masses of 2.5–2.8 g/m²) that are suitable for further cataphoretic staining at a temperature of 45–55°C.

Removal of Hydrocarbon Films from the Surface of Metal Materials in Air Glow Discharge

A. E. Gorodetskii, V. L. Bukhovets, R. Kh. Zalavutdinov, and A. P. Zakharov

Frumkin Institute for Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Moscow, Russia

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Received March 27, 2008

Abstract — Selective oxidation of amorphous hydrocarbon (a-C:H) films deposited on tungsten, molybdenum, and stainless steel by chemically active oxygen (with a source of glow discharge in air) has been studied. Film oxidation was carried out both directly in the discharge and in the area of afterglow. It has been shown that plasmolysis products of a-C:H films in air are CO, CO₂, H₂O, and H₂. The rate of film oxidation depended on the position in relation to plasma and decreased in the hollow cathode–positive column–afterglow series. The coefficients of carbon erosion in afterglow increased from 10^–3 to 10^–2 at. C/at. O at a temperature increase from room temperature to 130°C.

Biological Corrosion of Construction Materials at Nuclear Power Engineering Enterprises

G. V. Zhdanova^a and Yu. L. Kovalchuk^b

^a Institute of Nuclear Energy and Industry, Moscow, Russia

^b Severtsov Institute of Ecological and Evolutionary Problems, Russian Academy of Sciences, Moscow, Russia

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Received on September 08, 2008.

Abstract — The research data concerning the biological corrosion of construction materials for nuclear power plants (NPPs) are submitted in this article. The corrosion kinetic features of 08Kh18N10T and 20 steels in industrial neutral electrolyte are analyzed before and after the above steel types are contaminated with microorganisms. The effects of microorganisms and the products of their metabolism on the corrosion of biocide component-protected steels are evaluated.

Cyclic Voltammetry as a Method for Simulating the Operation of a MetalPolymer Coating System

A. M. Lyakhovich^a, A. V. Syugaev^a, N. V. Lyalina^a, and S. M. Reshetnikov^b

^a Physicotechnical Institute, Ural Branch, Russian Academy of Sciences, Izhevsk, Russia

^b Udmurt State University, Izhevsk, Russia

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Received March 22, 2008