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<article article-type="research-article" dtd-version="1.3" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xml:lang="ru"><front><journal-meta><journal-id journal-id-type="publisher-id">btps</journal-id><journal-title-group><journal-title xml:lang="ru">Безопасность техногенных и природных систем</journal-title><trans-title-group xml:lang="en"><trans-title>Safety of Technogenic and Natural Systems</trans-title></trans-title-group></journal-title-group><issn pub-type="epub">2541-9129</issn><publisher><publisher-name>Don State Technical University</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.23947/2541-9129-2024-8-4-47-53</article-id><article-id custom-type="edn" pub-id-type="custom">AFQAPG</article-id><article-id custom-type="elpub" pub-id-type="custom">btps-415</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>ХИМИЧЕСКИЕ ТЕХНОЛОГИИ, НАУКИ О МАТЕРИАЛАХ, МЕТАЛЛУРГИЯ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>CHEMICAL TECHNOLOGIES, MATERIALS  SCIENCES, METALLURGY</subject></subj-group></article-categories><title-group><article-title>Микродуговое молибденирование стали с использованием молибдата аммония</article-title><trans-title-group xml:lang="en"><trans-title>Microarc Molybdenum Steel Saturation Using Ammonium Molybdate</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-1537-9397</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Степанов</surname><given-names>М. С.</given-names></name><name name-style="western" xml:lang="en"><surname>Stepanov</surname><given-names>M. S.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Макар Степанович Степанов, доктор технических наук, профессор кафедры управления качеством</p><p>344003, г. Ростов-на-Дону, пл. Гагарина, 1</p><p>ScopusID, ResearcherID</p></bio><bio xml:lang="en"><p>Makar S. Stepanov, Dr.Sci. (Eng.), Professor of the Quality Management Department</p><p>1, Gagarin Sq., Rostov-on-Don, 344003</p><p>ScopusID, ResearcherID</p></bio><email xlink:type="simple">stepanovms@yandex.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-2937-8632</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Домбровский</surname><given-names>Ю. М.</given-names></name><name name-style="western" xml:lang="en"><surname>Dombrovskii</surname><given-names>Y. M.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Юрий Маркович Домбровский, доктор технических наук, профессор кафедры материаловедения и технологии металлов</p><p>344003, г. Ростов-на-Дону, пл. Гагарина, 1</p><p>ScopusID</p></bio><bio xml:lang="en"><p>Yuriy M. Dombrovskii, Dr.Sci. (Eng.), Professor of the Materials Science and Technologies of Metals Department</p><p>1, Gagarin Sq., Rostov-on-Don, 344003</p><p>ScopusID</p></bio><email xlink:type="simple">yurimd@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Донской государственный технический университет</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Don State Technical University</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2024</year></pub-date><pub-date pub-type="epub"><day>27</day><month>11</month><year>2024</year></pub-date><volume>0</volume><issue>4</issue><fpage>47</fpage><lpage>53</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Степанов М.С., Домбровский Ю.М., 2024</copyright-statement><copyright-year>2024</copyright-year><copyright-holder xml:lang="ru">Степанов М.С., Домбровский Ю.М.</copyright-holder><copyright-holder xml:lang="en">Stepanov M.S., Dombrovskii Y.M.</copyright-holder><license xml:lang="ru" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>Данная работа распространяется под лицензией Creative Commons Attribution 4.0.</license-p></license><license xml:lang="en" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>This work is licensed under a Creative Commons Attribution 4.0 License.</license-p></license></permissions><self-uri xlink:href="https://www.bps-journal.ru/jour/article/view/415">https://www.bps-journal.ru/jour/article/view/415</self-uri><abstract><p>Введение. Одной из актуальных проблем современного материаловедения является повышение надежности и долговечности инструмента и деталей машин. Для ее решения целесообразно создание высокотвердых покрытий с повышенными эксплуатационными характеристиками. Как правило, для этого используется высокоэнергетическое воздействие на материал. Однако оно требует использования сложного и дорогостоящего оборудования и не получило широкого распространения. Поэтому в настоящее время проблема создания таких покрытий остается актуальной. Эффективным и недорогим методом создания таких покрытий на стальных изделиях является микродуговое поверхностное легирование из обмазки, предварительно наносимой на поверхность упрочняемых изделий. Целью работы являлась оценка возможности создания таких покрытий с помощью диффузионного молибденирования с использованием молибдата аммония в качестве источника диффузанта.Материалы и методы. Для достижения цели исследования использовали термодинамический анализ химических реакций, протекание которых возможно в температурном диапазоне процесса микродугового нагрева. Для каждой реакции рассчитывали изменение стандартной энергии Гиббса, что позволило определить возможность и диапазон их протекания. Экспериментальное исследование процесса микродугового молибденирования с использованием молибдата аммония выполнено с использованием лабораторной установки на образцах из стали 20; поверхностная плотность тока составляла 0,53 А/см2; продолжительность процесса — 6 минут.Результаты исследования. Рассчитаны зависимости изменения свободной энергии Гиббса для химических реакций, протекание которых возможно при термическом разложении молибдата аммония. Экспериментально установлено формирование молибденированного покрытия и определена концентрация молибдена в диффузионном слое. На поверхности образцов обнаружены карбиды Mo2C и Fe3Mo3C. Определена зависимость глубины покрытия от содержания диффузанта в обмазке и от ее толщины.Обсуждение и заключение. Анализ полученных уравнений показал возможность образования атомарного молибдена прямым восстановлением или через промежуточное образование диоксида. Результаты экспериментальных исследований подтвердили образование диффузионного покрытия на стали после микродугового насыщения молибденом. Глубина такого покрытия зависит от содержания диффузанта в обмазке и от ее толщины. Полученные результаты могут быть использованы при разработке технологических процессов микродугового молибденирования стальных изделий</p></abstract><trans-abstract xml:lang="en"><p>Introduction. One of the most significant challenges in modern materials science is increasing the reliability and durability of tools and machine parts. To address this issue, it is essential to develop high-hardness coatings with enhanced properties. Typically, high-energy techniques are employed for this purpose, but they require complex and costly equipment, limiting their widespread use. Therefore, problem of creating such coatings remains a significant challenge. An effective and affordable approach to creating these coatings on steel products is microarc surface alloying from a coating pre-applied to the surface of the hardened products. The aim of the work was to assess the potential of diffusion molybdenum saturation for creating such coatings. Ammonium molybdate was used as the diffusant agent.Materials and Methods. To achieve the aim of this study, we used thermodynamic analysis of chemical reactions that can occur within the temperature range of the microarc heating process. For each reaction, we calculated the change in standard Gibbs energy, which allowed us to determine the feasibility and range of occurrence. An experimental study of the microarc molybdenum saturation process was conducted using ammonium molybdate on steel 20 samples using a laboratory setup. The surface current density was set at 0.53 A/cm², and the duration of the process was 6 minutes.Results. The Gibbs free energy changes for chemical reactions that can occur during the thermal decomposition of ammonium molybdate have been calculated. An experimental study has shown the formation of a molybdenum coating, and the concentration of molybdenum in the diffusion layer has been determined. On the surface of the samples, carbides Mo2C and Fe3Mo3C have been found. The dependence of the coating depth on the content of diffusant in the coating and its thickness has been determined.Discussion and Conclusion. Thermodynamic analysis has shown that atomic molybdenum can be formed through direct reduction or with the intermediate formation of molybdenum dioxide. The research has confirmed the formation of a diffusion coating on steel after microarc saturation with molybdenum, and the depth of this coating depends on the amount of diffusant in the coating and its thickness. These findings will be used to develop technological processes for microarc molybdenum plating of steel products.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>микродуговое поверхностное легирование</kwd><kwd>диффузионное насыщение молибденом</kwd><kwd>формирование высокотвердого покрытия</kwd></kwd-group><kwd-group xml:lang="en"><kwd>microarc surface alloying</kwd><kwd>diffusion molybdenum saturation</kwd><kwd>formation of a high-hardness coating</kwd></kwd-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Mittemeijer EJ, Somers MAJ. (eds). Thermochemical Surface Engineering of Steels. 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