Research of corrosion durability of porous materials with protective coatings

DOI: 10.62564/M4-OP1350

Oleksandr Povstianoi, Nataliia Imbirovych

Lutsk National Technical University, Ukraine


Problem statement and objective. The modern stage of the development of materials science is accompanied by the emergence of new ideas for the creation and improvement of the technology of obtaining porous materials on LH15 steel powder, which, above all, are aimed at achieving high operational characteristics and reducing their cost. To apply a corrosion-resistant protective coating on porous materials, you can use the method of plasma-electrolytic oxidation (PEO), which is one of the most modern and promising methods of obtaining protective layers on the surface of metals and alloys. The properties of the obtained coatings are determined by the composition of the electrolyte and the modes of the PEO process [1]. Methods. To oxidize porous materials, salt solutions (NaCl, NaClO 3 , NaI, NaNO 3 ), acid solutions (HCl, phosphoric, citric, tartaric, and adipic) are used. The most common and simple electrolytes based on KOH solution. Electrolytes based on KOH solution and liquid glass were chosen for research. The synthesis of OKP on a zirconium alloy in an electrolyte of 10 g/l of KOH and 15 g/l of liquid glass and a ratio of Ia/Ic = 20/20 ensured the formation of an already pink coating with a fairly high microhardness (16 GPa). Main results and Conclusions. Coatings synthesized by the method of plasma-electrolytic oxidation have low porosity. This is explained by the fact that the coating is synthesized at high temperatures, as a result of which the pores melt. Therefore, to increase the porosity, we performed the synthesis at lower temperatures [2]. The use of porous materials for for tribotechnical purpose made it possible due to their improved properties (high chemical resistance, required mechanical strength) to increase the service life of the porous material by 1.5-2.0 times. According to the developed technological regimes, anti-friction products with a significantly lower cost and a higher coefficient of material utilization compared to traditional materials were obtained from a composite based on LH15 steel powder.

Keywords
plasma-electrolytic oxidation, porous materials, corrosion

Acknowledgments
Not provided

References
[1] Nataliia Imbirovych, Krzystof Jan Kurdzydlowski, Oleksandr Povstyanoy, Valentyna Tkachuk. Features of the formation of ceramic coatings on titanium alloys by plasma-electrolytic treatment with the addition of hydroxyapatite and diatomite. HighMatTech-2023, 2-6 October 2023, Kyiv, Ukraine [2] Nataliia Imbirovych, Inna Boyarska, Oleksandr Povstyanoy, Krzysztof Kurdzydlowski, Sviatoslav Homon, Leonid Kulakovskyi Modification of oxide coatings synthesized on zirconium alloy by the method of plasma electrolytic oxidation / International scientific session on Аpplied Мechanics XI (17 Аugust 2023). V.2949 (1). P.https://doi.org/10.1063/5.0165655