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Документ Investigation of heat resistance of metal oxide coatings on AISI 304 stainless steel(2021) Shtefan, V. V.; Balamut, Nataliia; Kanunnikova, Nadiia; Kuznietsova, Anastasiia; Zuyok, Valeriy; Rostova, HannaSynthesized cathode Cr·CrOx and anodic FeOx metal oxide coatings on AISI 304 stainless steel. Their morphology and elemental composition have been studied. It was found that chromium-based oxide coatings increase the heat resistance of steel by 2-8 times and are resistant to temperatures of 1000 °C.Документ Corrosion resistance of AISI 304 steel from compositional oxide coatings(Фізико-механічний інститут ім. Г. В. Карпенка Національної академії наук України, 2020) Shtefan, V. V.; Kanunnikova, Nadiia; Smyrnov, A.; Shepil, T.Документ Корозійна тривкість сталі 08Х18Н10 із композиційними оксидними покриттями(Фізико-механічний інститут ім. Г. В. Карпенка НАН України, 2020) Штефан, Вікторія Володимирівна; Кануннікова, Надія Олександрівна; Смирнов, Олександр Олександрович; Шепіль, Тетяна ЕнверівнаObtaining materials with high corrosion properties is one of the priorities of the modern world. The modification of the oxide coatings of the steel surface will significantly reduce material costs for repair and downtime. The purpose of this work is the electrochemical study of the resistance of stainless steel with Cr·CrOx; Cr·CrOx·TiOy; Cr·CrOx·AlxOy in chloride medium. The corrosion resistance of composite oxide coatings on steel in a solution of 3,5% NaCl was determined by an electrochemical method, which consisted in the measurement of the free corrosion potentials, the potentiodynamic polarization of the samples, followed by the determination of the pitting potential and the calculation of the pitting resistance. Direct polarization of the working electrode was carried out at a velocity sweep of the potential of 1 mV / s to a value of current density jmax = 1,5 mA / cm2, then the scan was reversed to fully determine the electrochemical parameters of the resistance. Studies on the surface morphology of the samples after polarization were performed using a ZEISSAxio metallographic microscope. The obtained polarization dependences of the forward and backward motion allowed us to determine the potentials of pitting, the potentials of repassation. Calculated bases of pitting resistance ΔEb, ΔErp indicate that oxidized steel has good protective properties in chloride environment. It is revealed that on the surface of AISI 304 steel there are pits and results of fracture at grain boundaries after polarization by surface micrograph. Obtaining composite oxide coatings prevents the formation of pits on materials, which also confirm the obtained electrochemical parameters of pitting.Документ Електрохімічне формування молібденвмісних анодних оксидних покриттів на сталі 08Х18Н10(Київський національний університет технологій та дизайну, 2019) Штефан, Вікторія Володимирівна; Кануннікова, Надія ОлександрівнаThe kinetics of the anodic formation of oxide layers on steel in the potentiodynamic mode with a potential sweep rate of 2 mV·с-1 in acidic sulfate electrolytes was studied using the linear voltammetry method. It has been established that an increase in the concentration of molybdenum oxoanions leads to an increase in anodic currents and an expansion of the active dissolution region, to a shift of the stationary potential to an electropositive region, which indicates that oxoanions passivated the steel surface. Studies of the morphology and structures of the obtained coatings revealed that an increase in the concentration of molybdenum oxoanions leads to a decrease in the size of the globules, and at a certain concentration the association of the globules is observed.Документ Anodic dissolution of stainless steel in acid solutions(Таврійський національний університет ім. В. І. Вернадського, 2019) Shtefan, V. V.; Kanunnikova, Nadiia; Leshchenko, S. A.; Balamut, NataliiaIn this work, the kinetics of anodic dissolution of stainless steel was studied using linear voltammetry. It is shown that an increase in the concentration of molybdates leads to an increase in anodic currents and an expansion in the region of active dissolution, which indicates that the oxoanions of the steel surface are passivated. The influence of electrolyte composition on the formation of a passive film was investigated. It has been established that at high potential sweep rates, dense layers of stoichiometric oxide do not have time to form and the passive film has a defective structure. Molybdenum-, zirconium-, aluminum-, titanium-containing compounds have been shown to increase the passivity area, which is the basis for the formation of protective oxide films on stainless steel.Документ Корозійна стійкість оксидованої сталі 08Х18Н10 у хлоридних розчинах(Національний технічний університет "Харківський політехнічний інститут", 2019) Кануннікова, Надія Олександрівна; Штефан, Вікторія Володимирівна; Підреза, Віктор ПавловичДокумент Противокоррозионные и изоляционные свойства оксидных покрытий на стали 08Х18Н10(Харківський національний університет ім. В. Н. Каразіна, 2019) Канунникова, Надежда Александровна; Штефан, Виктория Владимировна; Бофанова, Мария Владимировна