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81.
Chemically Deposited Ni W B Coatings: Composition, Structure, and Properties1 A. B. Drovosekov, M. V. Ivanov, V. M. Krutskikh, E. N. Lubnin, and Yu. M. Polukarov Institute of Physical Chemistry, Russian Academy of Sciences,
Leninskii pr. 31, Moscow, 119991 Russia e-mail:
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Received December 26, 2003 Abstract - The effect of temperature and solution components of the chemical catalytic reduction on the composition of Ni–W–B alloy coatings is studied. The x-ray photoelectron spectroscopy in combination with the layer-by-layer profile analysis is used to determine the chemical state of elements and the composition of surface and bulk layers of the coatings containing 28 and 1.8 wt % (10 and 12 at. %) tungsten and boron, respectively. The surface of such coatings is shown to contain up to 90 and 80 at. % reduced nickel and boron, respectively. The deposits have amorphous structure. The effect of thermal treatment conditions on the structure and microhardness of the coatings is investigated. The coatings with a tungsten content of 10 at. % are shown to be nonmagnetic.
30/09/2008 | 1370 Hits | Print
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82.
Corrosion Inhibitors of the SNPKh Type. 1. Development and Study of the Protective Effects of Corrosion Inhibitors Based on Heterocyclic Nitrogen-Containing Compounds O. V. Ugryumov*, O. A. Varnavskaya*, V. N. Khlebnikov*, Yu. N. Kamzina*, D. N. Lebedev*, G. V. Romanov*, Ya. V. Ivshin**, R. A. Kaidrikov**, F. Sh. Shakirov***, and F. I. Dautov*** * JSC “Research Institute of Oil-Field Chemistry” (NIIneftepromkhim),
ul. N. Ershova 29, Kazan, 420045 Tatarstan, Russia e-mail:
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** Kazan State Technological University, ul. Karla Marksa 68, Kazan, 420015 Tatarstan, Russia *** TatNIPIneft’, Bugulma, Tatarstan, Russia Received October 14, 2003 Abstract — Protective effects of aryloxycarbonylmethylisoquinolinium chlorides on the iron surface were studied. The best results were obtained with decylphenoxycarbonylmethylisoquinolinium chloride (DPCMIQC)containing the alkyl C10 in the aryl fragment. This salt was used as an active component in an SNPKh-type corrosion inhibitor. Experimental data for this inhibitor were compared with the results obtained in bench and commercial field tests in West Siberia and the Ural–Volga region.
30/09/2008 | 1497 Hits | Print
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83.
A Role of Manganese in the Corrosion and Electrochemical Behavior of Stainless Steels A. G. Tyurin Chelyabinsk State University, ul. Brat’ev Kashirinykh 129, Chelyabinsk, 454021 Russia e-mail:
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Received June 8, 1999; in final form, December 15, 2003 Abstract — Sections of phase diagrams for the Fe–Mn–O system and potential–pH diagrams for the systems Fe–Mn–H2O,  -phase (austenite of 12 18 10 or 10 14 14 4 steels)–H2O, and MnS–H2O at 25°C are plotted. Thermodynamic aspects of the effect of manganese on the corrosion and electrochemical behavior of stainless steels are discussed.
30/09/2008 | 1613 Hits | Print
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84.
Carbon Dioxide Corrosion of Oil and Gas Field Equipment L. S. Moiseeva Scientific and Engineering Center, Oil Company “LUKOIL,” ul. Usacheva 11, Moscow, 119048 Russia e-mail:
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Received August 6, 1999; in final form, December 3, 2003 Abstract — Conditions for carbon dioxide corrosion in oil, gas, and gas-condensate fields are discussed. Corrosion mechanisms in oil, gas, and gas-condensate fields and gas and oil pipelines are compared. Various factors are shown to affect the CO2 corrosion rate of steel in oil and gas field media.
30/09/2008 | 1516 Hits | Print
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85.
To the Theory of Electrocapillarity R. R. Salem Higher College of Chemistry, Russian Academy of Sciences, Miusskaya pl. 9, Moscow, 125047 Russia e-mail:
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Received October 6, 2003 Abstract — The possibility of constructing molecular thermodynamics of surface phenomena is demonstrated. It is already 125 years since the main work of J.W. Gibbs “On the Equilibrium of Heterogeneous Substances” [1], where a fundamental theory of capillarity was developed, has been published. Up to now, this theory forms the basis of thermodynamics of almost all the surface phenomena and for exploring novel directions in the surface science.
30/09/2008 | 1345 Hits | Print
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86.
Types and Peculiarities of the Corrosion Damage to Metal Equipment of Primary Oil Processing Plants V. V. Burlov and I. V. Parputs All-Russia Research Institute of Oil Treatment Processes,
Zheleznodorozhnyi pr. 40, St. Petersburg, 192148 Russia
e-mail:
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Received May 28, 2001; in final form, March 4, 2004 Abstract — Structural materials and typical corrosion damage to the equipment of primary oil processing plants are considered. The damage and, primarily, the corrosion cracking of austenitic welds is provoked by the steam-ing operations, as well as idle times due to repairs and other cases when corrosive condensates and deposits collected in the equipment. Additional investigations are required to develop protective measures for the equipment against corrosion.
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