Metal Protection by Anticorrosion Papers in Humid Tropical Climate

V. N. Ivonin^a, Chin Kuok Khan’^a, T’y Min Tien^a, Yu. I. Kuznetsov^b, N. N. Andreev^b,
N. V. Lavrinova^b, and V. A. Karpov^c

^aJoint Russian and Vietnamese Tropical Research and Technology Center, Hanoi, Vietnam

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

^cSevertsov Institute of Ecology and Evolution, Russian Academy of Sciences, Moscow, Russia

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Received January 15, 2008

Abstract — Results of 3-year full-scale field climatic tests on application of five types of inhibiting papers for anticorrosion protection of ferrous and nonferrous metals during storage in a humid tropical climate have been carried out by the Joint Russian and Vietnamese Tropical Research and Technology Center and presented here. It has been shown that the inhibiting paper IPCAS-118 can be recommended for anticorrosion protection of equipment made of steel, copper, and aluminum during 3-year storage in sheds in humid tropical climate conditions

On the Use of Surfactants in the Production of Migrating Corrosion Inhibitors

E. V. Starovoitova, N. N. Andreev, I. A. Gedvillo, and A. S. Zhmakina

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

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Received April 8, 2008

Abstract — The effect of surfactants on the ability of an inhibitor to penetrate cast stone and protect the reinforcing steel is studied. With accelerated methods, the effectiveness of IFKhAN-80, IFKhAN-80M, MCI 2020, NaNO₂, NaNO₂ + “A”, and “A” surfactants as migrating inhibitors is estimated. An IFKhAN-80M composite is found to provide the effective protection of steel under conditions simulating the effect of migrating inhibitors.

Inhibition of Carbon Steels from Hydrogen-Sulfide Corrosion with Triazoles

L. V. Frolova, Yu. I. Kuznetsov, and O. O. Zel’

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

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Received July 2, 2008

Abstract — The protective effect of six organic triazole series compounds with respect to carbon steels in water chloride solutions with high concentration of H₂S (2 g/l) has been studied. Under these conditions, the most efficient inhibitor of hydrogen-sulfide corrosion is 3-N,N-dibenzoamino-1,2,4-triazole (DBAT) and the least efficient is 1,2,3-benzotriazole. DBAT can suppress or considerably slow down the hydrogen-sulfide corrosion of steels due to the inhibition of both electrode reactions on the surface.

Influence of Catamine AB on the Reaction of Hydrogen Discharge and Its Diffusion into Steel in Acidic Chloride Media

L. E. Tsygankova, A. S. Protasov, and D. B. Balybin

Tambov Derzhavin State University, Tambov, Russia

e-mail: vits21@mauju

Received February 19, 2008

Adsorption of 5-Phenyltetrazole on Iron and Its Inhibition of the Dissolution of Low-Carbon Steel in a Neutral Solution

N. P. Andreeva^a, L. P. Kazanskii^a, I. A. Selyaninov^a, Yu. I. Kuznetsov^a, and V. A. Ostrovskii^b

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

^b St. Petersburg State Technological University, St. Petersburg, Russia

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Received July 21, 2008

Abstract—The anodic behavior of St3 steel in a neutral borate buffer solution containing various concentrations of 5-phenyl (PTA) and aggressive sodium chloride additives and the adsorption PTA on the surface of pure iron are studied. Ellipsometry is used to show that the adsorption of PTA begins at concentrations of less than 10^–6 mol/l, which is three orders of magnitude lower than that for an inhibitor such as benzotriazole (BTA). It was shown by X-ray photoelectron spectroscopy that the PTA adsorption is reversible at low exposures of samples in a solution. PTA forms a layer more than 1 nm thick only upon the exposure of samples in the solution for more than 48 h. PTA can reduce the passivation current, though less effectively than BTA. PTA hampers the local depassivation of steel more effectively than BTA.

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.