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Information × Registration Number 0226U000580, (0125U000029) , R & D reports Title Development of Methods for Applying Protective Coatings to Nuclear Power Plant Equipment popup.stage_title Дослідження кінетики електрохімічних процесів одержання металоксидних покриттів Head Kanunnikova Nadiia O., Доктор філософії Registration Date 12-01-2026 Organization National Technical University "Kharkiv Polytechnic Institute" popup.description1 The goal of the project is to determine the optimal parameters for the processes of forming protective coatings on AISI 304 steel, which will exhibit enhanced resistance to high-temperature corrosion in the coolant environment of the primary and secondary circuits of VVER-1000 reactors, as well as to define their composition and structure. popup.description2 Protective metal-oxide coatings for nuclear power plant equipment have been developed and studied to enhance the corrosion and high-temperature resistance of stainless steels. The coatings were formed electrochemically based on black chromium, modified with titanium and aluminum oxides. The composition of the electrolytes and the coating formation parameters were optimized, enabling the production of uniform metal-oxide layers with a thickness of 12 ± 1.2 µm. Scanning electron microscopy and energy-dispersive analysis revealed that modification with Al2O3 and TiO2 oxides leads to a reduction in the width and number of cracks in the coatings, as well as the formation of a denser microstructure. X-ray phase analysis confirmed the presence of Cr, TiO1.04, and Al2O3 phases. Coatings modified with aluminum oxide exhibited increased crystallinity and reduced defectiveness. Electrochemical studies in 3.5 wt.% NaCl showed a decrease in corrosion current density from (1.26·10-6 A·cm-2) for uncoated steel to (1.8–3.9)·10-7 A·cm-2 for coated steel. Impedance spectroscopy revealed an increase in the impedance modulus by 3–4 times for black chromium and up to 11 times for coatings modified with Al2O3. Under galvanic coupling conditions in 6 wt.% NaCl, the corrosion current density was reduced by 6–7.5 times when paired with zinc. High-temperature tests in water vapor at 800 °C demonstrated a decrease in mass gain of coated samples to 8.8–13.0 mg·dm-2, compared to 220 mg·dm-2 for uncoated steel. Product Description popup.authors Andriі I. Dobrozhan Albert D. Dzhamirzoiev Valentyna V. Voloshchuk Yehor S. Lehenkyi Antonina O. Sakun Alona S. Bosiuk Anastasiia S. Shcholokova Artur V. Havryk Danylo A. Tykhenko popup.nrat_date 2026-01-12 Close