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"Corrosion: protection, materials", Appendix to the journal "Technology of Metals" №14'2025 |
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| Table of contents
General problems of corrosion
- Modeling of continuous corrosion to assess service life of vertical steel tank G. S. Ammosov; D. S. Ivanov; A. S. Krotov; O. V. Startsev (E-mail: ammosov.g@mail.ru)Federal Research Centre «Yakutsk Scientific Centre, RAS, Siberian Branch», V. P. Larionov Institute of Physical-Technical Problems of North, RAS, Siberian Branch, Yakutsk, 677980, Russian Federation., 1
The development of a mathematical model of continuous corrosion with the example of a vertical steel tank for storage of petroleum products, which is operated under conditions of low climatic temperatures, is discussed. The necessity of finding accurate values of the initial thickness of the tank wall, filling height and average annual temperature to determine the corrosion rate is emphasized. This model can be used to predict the service life of tanks.
Keywords: tank, continuous corrosion, thickness, liquid level, temperature, service life.
- Corrosive damages of main gas pipelines of Republic of Sakha (Yakutia) A. V. Burnashev; A. S. Syromyatnikova; A. R. Ivanov (E-mail: a.v.burnachev@mail.ru)Federal Research Centre «Yakutsk Scientific Centre, RAS, Siberian Branch», V. P. Larionov Institute of Physical-Technical Problems of North, RAS, Siberian Branch, Yakutsk, 677980, Russian Federation., 7
A review of corrosion damages of long-term operated gas pipelines in the Republic of Sakha (Yakutia) is presented, causes, mechanisms and scenarios for the development of corrosion damages in cryolithozone conditions are discussed. Analysis of accidents that occurred due to corrosive wear allows us to conclude that the possibility of corrosion damages and losses of performance of long-term operating main gas pipelines increases.
Keywords: corrosion, gas pipeline, long-term operation, damage, destruction, cryolithozone, steel.
- Features of stability of passive state and depassivation of easily passivated metals and alloys N. L. Bogdashkina; M. V. Gerasimov (E-mail: bogdnat45@yandex.ru)A. N. Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Moscow, 119071, Russian Federation., 12
Titanium and its alloys are widely used due to their high corrosion resistance in acids and other aggressive environments. However, in a number of particularly aggressive environments, including at elevated temperatures, additional corrosion protection is required. For this purpose, various methods of surface modification of titanium and its alloys, as well as bulk alloying, can be used. The features of selective dissolution and stability of the passive state of easily passivated metals and alloys (titanium, chromium-containing steels) in highly aggressive acids are considered. As previously established, the accumulation of the cathode component on the surface of alloys as a result of selective dissolution of the base, for example titanium, contributes to the transition of dissolution from the active region to the passive one. However, the stability of the passive state for a long time is not secured and can be disrupted as a result of a number of processes caused by the aggressiveness of the solution, temperature, and surface condition of the alloy. This feature requires constant monitoring of the alloy condition in order to avoid emergencies.
Keywords: corrosion, passivation, depassivation, cathode additive, titanium.
- Effect of alkali metals on corrosion-electrochemical behavior of lead babbits B (PbSb15Sn10) in NaCl solution medium Kh. M. Khodzhanazarov (E-mail: khayrullo.khodzhanazarov@bk.ru)M. S. Osimi Tajik Technical University, Dushanbe, 734042, Republic of Tajikistan., 17
The study results of the effect of lithium, sodium and potassium additives (0.01—1.0% (wt.)) as structure modifiers on the anodic behavior of lead babbitts B (PbSb15Sn10) in a NaCl solution are presented. The studies were carried out potentiostatically in the potentiodynamic mode with a potential scan rate of 2 mV / s. The studies have shown that over time, the free corrosion potential of the alloys shifts to the positive side and acquires a positive value with an increase in the modifier concentration (lithium, sodium and potassium) in lead babbitts. Addition of lithium to lead babbitt B (PbSb15Sn10) — 8—14% in number, sodium B (PbSb15Sn10) — 10—16% in number, and potassium B (PbSb15Sn10) — 12—20% in number increases its corrosion resistance. An increase in the corrosion rate of alloys was noted concerning the concentration of NaCl in the solution, regardless of alloys’ composition. It is shown that an increase in the concentration of chloride ion in the NaCl solution leads to a decrease in the potentials of free corrosion, repassivation and pitting of alloys.
Keywords: lead babbitts B (PbSb15Sn10), lithium, sodium, potassium, potentiostatic method, electrochemical behavior, NaCl solution, free corrosion potential, corrosion rate.
Methods of study and corrosion monitoring
- Experience in precipitation analysis when solving applied problems in monitoring of corrosion processes during gas transportation and processing R. K. Vagapov1; A. V. Kattasheva2 (E-mail: R_Vagapov@vniigaz.gazprom.ru)1«Gazprom VNIIGAZ» LLC, Razvilka, 142717, Moscow District, Russian Federation.2«Gazprom Dobycha Noyabrsk» LLC, Noyabrsk, Yamal-Nenets Autonomous Okrug, 629806, Russian Federation., 25
One of the ways to determine the mechanisms and dangers of corrosion processes is to analyze the precipitations that are being formed. The experience of conducting such analyzes in gas fields is described. The chemical nature of precipitations can be organic or inorganic, and in accordance with this, certain methods of analysis are selected. In our work we used the X-ray diffraction method, the infrared spectroscopy method and the electron microscopy method. The study identified the reasons for the detection of sulfur deposits and analyzed the potential impact of sulfur compounds occurring in petroleum gas on their formation. A complex of precipitations formed on the internal and external (at the site of a defect in the pipe) surfaces of a water pipeline has been identified. The potential impact of operational factors and operating modes of gas field facilities on the formation and composition of the studied precipitations was assessed. Identification of the causes of corrosion processes allows timely development and implementation of a set of measures for anti-corrosion protection of gas field facilities.
Keywords: precipitations, gas field, corrosion destruction, operating environments, methods of analysis.
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