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2018/2
Study of acoustic emisiion signals, generated by corrodible carbon steel
Technical sciences

Authors: Daniel A. ALEKSEEV completed Master Degree Program of Gubkin Russian State University of Oil and Gas (National Research University) in 2017. He is engineer of the Department of Physical Metallurgy and Non-metallic Materials.
E-mail: fim@gubkin.ru
Marina L. MEDVEDEVA graduated from Gubkin Moscow Institute of Petrochemical and Gas Industry in 1973. She has been working as professor of the Department of Physical Metallurgy and Non-metallic Materials of Gubkin Russian State University of Oil and Gas (National Research University) since 2008. She is specialist in the field of materials scien- ce, electrochemistry and corrosion protection of oil and gas equipment. She is author of 10 textbooks (2 in the English language) and more than 70 scientific papers.
E-mail: fim@gubkin.ru
Alexander K. PRYGAEV graduated from the Moscow Institute of Petrochemical and Gas Industry by Gubkin in 1971. He has been Head of the Department of Physical Metallurgy and Non-metallic Materials since 2001 and Dean of the Faculty of Mechanical Engineering since 1995 of Gubkin Russian State University of Oil and Gas (National Research University). He is specialist in the field of materials science, welding of oil and gas equipment. He is author of more than 60 scientific works and a number of textbooks.
E-mail: fim@gubkin.ru

Abstract: The results of research conducted to determine the possibility of application of acoustic-emissive method for the exposure of corrosion of carbon steel are pre-sented. The developed methodology allowed steady separation of acoustic sig-nals, characteristic for dissolution of metal, from those characteristic for the selection of hydrogen. It is determined that basic identification parameter of the signals characteristic for dissolution of metal is their frequency of the basic maximum of energy equal to 50 khz. The results can be used to improve the systems of acoustic-emissive corrosive monitoring

Index UDK: 620.193:620.179.17

Keywords: acoustic-emissive method, corrosion, monitoring, dissolution of metal, oil and gas industry

Bibliography:
1. Monakhov A.N., Trofimov P.N., Alyakritskii A.L., Elizarov S.V. System of complex corrosion monitoring of primary oil processing facility. STA, 2006, no. 2, p. 38–42 (in Russian).
2. Medvedeva M.L., Prygaev A.K., Markov E.A., Popkov Yu.S., Chernykh M.V. Study of the possibilities of acoustic emission control in relation to problems of corrosion monitoring of equipment for primary oil refineries. C.I. Registration of general corrosion. Corrosion: materials, protection, 2012, no. 12, pp. 36–41 (in Russian).
3. Medvedeva M.L., Ratanova M.D. Identifying main source of acoustic emission under general corrosion of carbon steel. Proceedings of the Gubkin Russian State University of Oil and Gas, 2014, no. 2, p. 94–102 (in Russian).
4. Kuznetsov D.M., Gaponov V.L., Korobkov M.S., Kozachenko P.N. Acoustic method monitoring electrochemical proctsses. Engineering journal of Don, 2014, no. 2, p. 39–46 (in Russian).
5. Miguel A. Correlation of Acoustic Emission with the Corrosion of Aluminium 6063 alloy in 5 % NaCl. 5th Pan American Conference for NDT, 2–6 October 2011, Cancun, Mexico.
6. Kharebov V.G., Zhukov A.V., Kuzmin A.N., Shitov D.V. Acoustic emission in the case of corrosion damage to pipelines. In the world of non-destructive testing, 2014, no. 4, p. 14–32 (in Russian).
7. Adrian A. Pollock. Acoustic Emission Capabilities and Applications in Monitoring Corrosion. Nondestructive Testing and Electrochemical Methods, 1986, p. 30–41.

2014/3
Possibilities of applying acoustic emission sensors for monitoring general corrosion of carbon steel with nitrogen bubbling through working environment
Industrial and environmental safety, occupational safety and health

Authors: Marina L. MEDVEDEVAgraduated from Gubkin Moscow Institute of Petrochemical and Gas Industry in 1973. She is Doctor of Technical Sciences, full professor of the Department Metal Science and Non-Metallic Materials at Gubkin Russian State University of Oil and Gas. She is a specialist in the field of corrosion and protection of equipment of oil and gas industry. She is author of more than 80 scientific papers. E-mail: marmed04@mail.ru
Margarita D. RATANOVAis graduate student of Gubkin Russian State University of Oil and Gas at the Faculty of Mechanical Engineering. Since 2012 she has been a researcher of the Department of Metal Science and Non-Metal Materials. E-mail: rita-ratanova@rambler.ru

Abstract: Possibility of acoustic emission (AE) monitoring of carbon steel general corrosion during nitrogen barbotage through environment was investigated. The source of noise was similar to the main source of AE-signal during corrosion (cathodic hydrogen), i.e. nitrogen barbotage through environment. Corrosion of Steel 20 was investigated in electrolyte-solutions with pH 1,05,5 with and without nitrogen barbotage. Corrosion rate was determined by the gravimetric method. Parameters of AE signals were registered from GT200sensors using A-Line 32D (PCI-8) 4.98. multichannel system It was shown that there is a principal possibility of AE-corrosion monitoring even while bubbling nitrogen through an environment. It is possible to register the change in corrosion mechanism by means of AE-monitoring. These results can be used at refineries in corrosion monitoring systems

Index UDK: УДК 669.018.8.001; 534.8.081.7

Keywords: corrosion, acoustic emission, signal, corrosion environments

Bibliography:
1. Online resource — http://protectcor.narod.ru/
2. Investigation of possibilities of acoustic emission monitoring in relation to the problems of corrosion monitoring equipment crude oil distillation plants. Ch. I. Registration the general corrosion. M.L. Medvedevа, A.K. Prygaev, E.A. Markov, Y.S. Popkov, M.V. Chernyh. Corrosion: Materials, protection, 2012, no. 12, p. 36.
3. Medvedeva M.L., Ratanova M.D. Identifying main source of acoustic emission under general corrosion of carbon steel. Proceedings of the State University of Oil and Gas named after I.M. Gubkin, 2014, no. 2, p. 94–102.
4.
GOST 9.908-85 4. Unified system of corrosion and ageing protection. Metals and alloys. Methods for determination of corrosion and corrosion resistance indices.
5. Medvedevа M.L. Corrosion and protection equipment in the processing of oil and gas. M.: Federal State Unitary Enterprise Moscow, Oil and Gas State University of Oil and Gas. I.M. Gubkin, 2005, p. 312.

2014/2
Identifying main source of acoustic emission under general corrosion of carbon steel
Industrial and environmental safety, occupational safety and health

Authors: Marina L. MEDVEDEVA graduated from Gubkin Moscow Institute of Petrochemical and Gas Industry in 1973. She is Doctor of Technical Sciences, full professor of the Department Metal Science and Non-Metallic Materials at Gubkin Russian State University of Oil and Gas. She is a specialist in the field of corrosion and protection of equipment of oil and gas industry. She is author of more than 80 scientific papers. E-mail: marmed04@mail.ru
Margarita D. RATANOVA is a student of Gubkin Russian State University of Oil and Gas of the Faculty of Mechanical Engineering. Since 2012 she has been a member of the Department Metal Science and Non-Metallic Materials.E-mail: rita-ratanova@rambler.ru

Abstract: The need to develop and improve corrosion monitoring systems requires consi- dering the possibility of using acoustic emission monitoring systems to control general corrosion of crude oil distillation plants. The aim of the work was to iden-tify the source of acoustic emission during corrosion of carbon steel at rates close to those in operating conditions of these facilities. It was found that under carbon steel corrosion the main source of acoustic emission is hydrogen generated during cathodic reaction. The AE method can be considered as the basis for the creation of corrosion monitoring systems designed to control on-line the corrosion of the equipment and piping lines of the heads of the crude distillation unit

Index UDK: УДК 669.018.8.001; 534.8.081.7

Keywords: corrosion, acoustic emission, signals, corrosion media

Bibliography:
1. Alyakritsky A.L., Popkov Y.S., Sorokin E.Y., Terent’ev D.A. Determination of the pitting corrosion’ depth and Acoustic emission control of corrosion development. Himicheskaja tehnika, 2008, no. 8, p. 8-10 (in Russian).
2. Spravochnik himika. T. 3. Himicheskoe ravnovesie i kinetika. Svojstva rastvorov. Jelektrodnye process [Handbook for chemist. V.3. Chemical equilibrium and kinetics. Properties of fluids. Electrode processes]. Chemistry, M., Leningrad, 1964, 1008 
р.
3.Pollock A.A. Acoustic Emission Capabilities and Applications in Monitoring Corrosion. Corrosion Monitoring in Industrial Plants Using Nondestructive Testing and Electrochemical Methods. ASTM STP 908, G.C. Moran and Р. Labine, Eds., American Society for Testing and Materials, Philadelphia, 1986, p. 30
-42.
4. Baranov V.M., Gubin
а T.V. Primenenie akusticheskoj jemissii dlja issledovanija i kontrolja korrozionnyh processov [Application of acoustic emission for research and monitoring of corrosion processes]: Textbook. MEPI, 1990, 72 p.
5. Lublinsky E.Y. Elektrohimicheskaja zashhita ot korrozii [Electrochemical corrosion protection]. Moscow
: Metallurgy, 1987, 97 p.