danДоклады Национальной академии наук БеларусиDoklady of the National Academy of Sciences of Belarus1561-83232524-2431The Republican Unitary Enterprise Publishing House "Belaruskaya Navuka"10.29235/1561-8323-2026-70-2-126-134dan-1302Research ArticleХИМИЯCHEMISTRYПрименение метода динамической импедансной спектроскопии для построения изотерм адсорбции молибдат-ионов на поверхности сплава магнияAplication of dynamic impedance spectroscopy for construction of adsorption isotherms of molybdate ions on magnesium alloyОсипенкоМ. А.OsipenkoM. A.

Осипенко Мария Александровна – инженер

ул. Свердлова, 13а, 220006, Минск

Osipenko Maria A. – Engineer

13a, Sverdlov Str., 220006, Minsk

osipenko@belstu.byКурилоИ. И.KuriloI. I.

Курило Ирина Иосифовна – канд. хим. наук, доцент, заведующий кафедрой

ул. Свердлова, 13а, 220006, Минск

Kurilo Irina I. – Ph. D. (Chemistry), Associate Professor,Head of the Department

13a, Sverdlov Str., 220006, Minsk

kurilo@belstu.byЦыгановА. Р.TsyhanauA. R.

Цыганов Александр Риммович – академик, д-р с.-х. наук, канд. хим. наук, профессор, ректор

ул. Славинского, 1/3, 220086, Минск

Tsyhanau Aliaksandr R. – Academician, D. Sc. (Agrarian), Ph. D. (Chemistry), Professor, Rector

1/3, Slavinsky Str., 220086, Minsk 

imb@imb.byБелорусский государственный технологический университетBelarusian State Technological UniversityМеждународный институт управления и предпринимательстваInternational Institute of Management and Entrepreneurship202604052026702126134Copyright © Осипенко М.А., Курило И.И., Цыганов А.Р., 20262026Осипенко М.А., Курило И.И., Цыганов А.Р.Osipenko M.A., Kurilo I.I., Tsyhanau A.R.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://doklady.belnauka.by/jour/article/view/1302

Методом динамической электрохимической импедансной спектроскопии изучено коррозионное поведение сплава магния AZ31 в 0,05 моль/дм3 растворе хлорида натрия в присутствии молибдата натрия, который вводили в коррозионную среду постепенно с постоянной скоростью до итоговой концентрации 50 ммоль/дм3. Полученные в данных условиях параметры многосинусоидального импедансного мониторинга соответствовали мгновенной концентрации ингибитора в конкретный момент времени, что позволило установить зависимость рассчитанных значений защитного эффекта от концентрации молибдат-ионов в растворе. На основе предположения, что полное заполнение поверхности ингибитором дает 100 %-ное снижение скорости коррозии, а, следовательно, значения степени заполнения поверхности соответствуют защитному эффекту ингибитора, построены кривые адсорбции молибдат-ионов на поверхности сплава магния AZ31 в разных феноменологических моделях адсорбции: Ленгмюра, Темкина, Флори–Хаггинса и Фрумкина. 

Dynamic electrochemical impedance spectroscopy was used to examine the corrosion behavior of AZ31 magnesium alloy in 0.05 mol/dm3 sodium chloride solution containing Na2MoO4 inhibitor, which was gradually added to the solution up to the concentration of 50 mmol/dm3. The parameters of multisinusoidal impedance monitoring obtained under these conditions corresponded to the instantaneous concentration of the inhibitor at a specific point in time. This made it possible to establish the dependence of the calculated values of the protective effect on the concentration of molybdate ions in the solution. Based on the assumption that complete coverage of the surface by the inhibitor provides 100 % reduction of the corrosion rate and the surface degree coverage corresponds to the protective effect of the inhibitor, the adsorption curves of molybdate ions on the surface of AZ31 magnesium alloy were constructed utilizing Langmuir, Temkin, Flory–Huggins, and Frumkin adsorption models.

сплавы магниямолибдат натрияингибитор коррозиидинамическая электрохимическая импедансная спектроскопиязащитный эффектизотерма адсорбцииmagnesium alloysodium molybdatecorrosion inhibitordynamic electrochemical impedance spectroscopyinhibition efficiencyadsorption isothermИсследования выполнены при финансовой поддержке Белорусского республиканского фонда фундаментальных исследований (проект Х24МВ-008), а также ГПНИ «Химические процессы и технологии», задание 3.This work was supported by the Belarusian Republican Foundation for Fundamental Research (grant no. Х24МВ-008), and State Program of Scientific Investigations “Chemical processes and technologies”, task 3.ReferencesSolomon, M. M. Carboxymethyl cellulose/silver nanoparticles composite: synthesis, characterization and application as a benign corrosion inhibitor for St37 steel in 15 % H2SO4 medium / M. M. Solomon, H. Gerengi, S. A. 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The authors declare that there are no conflicts of interest present.