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  • Ескіз
    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 Енверівна
    Obtaining 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.
  • Ескіз
    Документ
    Електрохімічне формування молібденвмісних анодних оксидних покриттів на сталі 08Х18Н10
    (Київський національний університет технологій та дизайну, 2019) Штефан, Вікторія Володимирівна; Кануннікова, Надія Олександрівна
    The 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.
  • Ескіз
    Документ
    Корозійна стійкість оксидованої сталі 08Х18Н10 у хлоридних розчинах
    (Національний технічний університет "Харківський політехнічний інститут", 2019) Кануннікова, Надія Олександрівна; Штефан, Вікторія Володимирівна; Підреза, Віктор Павлович