PSI - Issue 59

Igor Stadnyk et al. / Procedia Structural Integrity 59 (2024) 672–678 Igor Stadnyk et al./ Structural Integrity Procedia 00 (2023) 000 – 000

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Fig. 3. Microfractogram of steel 20 samples in fresh (a) and inhibited (b) water at the stage of spontaneous sample fracture.

Thus, according to the rate of protective film formation, the investigated samples show the results of high reagents concentration (over 40 g/l), and within the consumption range of 30-40 g/l, sample No. 1 is more effective. So, at the consumption rate of 35 g/l, the corrosion rate is 0.023 mm/year for sample No. 1, and 0.038 mm/year for sample No. 2, respectively. The following should be noted regarding the effectiveness of the protective effect of the investigated inhibitors: • the samples meet the technical requirements for corrosion inhibitors (Z not less than 90% at the consumption of 50 mg/l). The value of Z at this inhibitor consumption is 92.3%; • the investigated inhibitors show the same results in the area of high concentrations: 92.3 and 94% at consumptions of 50 and 70 g/l. In the area of concentrations up to 40 mg/l, sample No. 1 exceeds sample No. 2 in terms of protective effectiveness. Thus, at the consumption of 35 mg/l, Z indicator is 82% against 70% in the presence of inhibitor No 2. 4. Conclusions The prospect of using plant raw materials as corrosion inhibitors is because the proposed raw materials are processed annually by thousands of tons and generate a huge amount of cheap waste. Natural substances are often used to inhibit the corrosion of metals and alloys in solutions with low acid content (1-2 mol/l). Application of “Brassicaoleracea L. convar. capitata (L.) Alef. var. alba DC” makes it possible to eliminate or significantly reduce the ecological impact on the environment. The properties of new, environmentally safe, anti-corrosion biological inhibitors based on cabbage waste have been developed and investigated. Accordingly, mathematical models of protective effect of inhibitor compositions are created in order to predict anti-corrosion effect while they are used in industry technological environments. References Abdel-Gaber, A.M., Abd-El-Nabej, B.A., Khamis, E., Abd-El-Khalek, D.E., 2011. The natural extract as scale and corrosion inhibitor for steel surface in brine solution. Desalination 278, 337-342. Dovhal, E., Gur'eva, I., Kyslychenko, V., Zhuravel, I. O., 2016. Study of volatile fractions of the raw materials of narrow-leaved cattail (Typhaangustifolia L.). Science Rise: Pharmaceutical Science 2(2), 46-50. Hart, K., 2014. The inhibitive effect of aloe vera barbadensis gel on copper in hydrochloric acid medium. Journal of Emerging Trends in Engineering and Applied Sciences 5(1), 24-29. Iasnii, V., Nykyforchyn, H., Tsyrul ’ nyk, O., Student, O., 2019. Specific features of deformation of the nitinol alloy after electrolytic hydrogenation. Material Science 54, 582-588. Iasnii, V., Student, O., Nykyforchyn, H., 2019. Influence of hydrogenation on the character of fracture of nitinol alloy in tension. Material Science 55, 386 – 391. Khaburskyi, Ya.M., 2015. Corrosion-Resistant Properties of the Extracts of Plant Raw Materials in Solutions of Hydrochloric. Material Science 51, 131 137. Khoma, M., Vasyliv, Kh., Chuchman, M., 2022. The influence of hydrogen sulfide concentration on corrosion and hydrogenation of pipe steels (a survey). Material Science 57, 308- 318. Khoma, M.S., 2010. Problems of fracture of metals in hydrogen-sulphide media. Material Science 46(2), 190-200. Kityk, A., Protsenko, V., Danilov, F., Pavlik, V., Hnatko, M., Soltys, J., 2021. Enhancement of the surface characteristics of Tibased biomedical alloy by electropolishing in environmentally friendly deep eutectic solvent (Ethaline). Colloids and Surfaces A 613(36), 126125. Korniy, S.А., Zin, I.М., Тymus, M.B., Khlopyk, O. P., Danyliak, M. - O. М., 2021. Corrosion protection of carbon steel by a composition based on natural polysaccharide. Material Science 56(5), 602-607. Ledovs ’ kykh, V., Vyshnevs ’ ka, Yu., Brazhnyk , І., Levchenko, S., 2017. Development and Optimization of Synergistic Compositions for the Corrosion