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

674

3

following parameters also affect temperature interval of effectiveness and hydrodynamic conditions of the contour flow movement (Stadnyk et al., 2021; Leshchak et al. 2020). Natural plant products, industrial waste, and their extracts can be used as the components of inhibited systems (Shypyhuzov et al., 2016). In order to reduce the rate of acid corrosion, prickly pear extract, orange or avocado peel, tobacco, black pepper, castor seeds, Arabian gum, lignin, coriander, hibiscus, anise, black cumin, honey, onion, garlic, bitter gourd, etc. are used. These products have been widely investigateed as corrosion inhibitors and components of mixtures extracted from natural sources (Abdel-Gaber et al., 2011; Korniy et al., 2021). Extracts can be obtained in a simple way without additional purification. They contain natural products: essential oils, tannins, pigments, steroids, terpenes, flavones, and flavonoids. The selection of plant-based inhibitors is associated with the presence of S-, O-, P-, and N-containing compounds that are able to form complexes with iron atoms and oxides and create conditions for the formation of the metal surface passive state. The authors of papers (Korniy et al., 2021; Ledovs’kykh et al. , 2017) noted the anti-corrosive effect of the following substances: aldehydes, ketones, amines, phosphates, nitrates, alkaloids, glucosides, tannins, etc., which preserved the protection of St3 steel in food production operation conditions. It is known (Khaburskyi et al., 2015; Hart, 2014; Iasnii et al., 2019) that the application of individual additives is not effective in comparison with synergistic inhibitory compositions. HS-2 inhibitor on the basis of HS-1 and MH-CDTU inhibitors (4:1), i.e., modified vegetable oil is developed. The composition of the given inhibitor provides high anti-corrosion protection of steels in neutral and acidic environments (Z = 93.0-99.8 %) and has biocidal and bactericidal properties. The authors of paper (Sukhenko et al., 2013) recommend to use disinfectant in the solution in order to protect equipment at food processing plants. Data analysis makes it possible to determine the influence of water extracts on the inhibition of steel corrosion in water. Adsorption of the inhibitor sets the level of changes in the steel potential during the first minutes of the process. The sorption activity is determined by the ability of tannins to connect due to hydrogen bonds. The authors of paper (Dovhal et al., 2016) have found that in most cases single-component inhibitors are not effective. The search of synergistic inhibitory compositions, based on non-toxic components and additives of industrial wastesuch as: agrimus, sodium hydroxide, sodium nitrites, beer grains and others was carried out. The investigators established (Korniy et al., 2021; Ledovs’kykh et al. , 2017) that the effectiveness of carbon steel protection in technological environment is ensured by the following composition (in %): in water - 0.2 protein sediment and 0.4 gelatin; in 2% citric acid solution - 0.3 beer grain and 0.4 dextrin; in 5% sodium chloride solution - 0.3 dextrin and 0.2 gelatin. The combination of inhibitors, inhibited protective systems with other types of protective coatings, for example, with plasma coatings, is of great practical importance. Such protection can be applied to increase the durability of transport systems of diffusion devices of sugar factories. In paper (Slobodyan et al., 2021), a mixture of oxyethylenediphosphonic acid diethylene glycol and ammonium containing resin was used as the inhibitor. The authors of paper (Kityk et al., 2021) proposed to use the product of interaction of hexylenediamine with phosphoric acid and urea in the presence of glycerol as the inhibitor. The resulting inhibitor provides 83-99% protection against sediment deposits in neutral water with total salt content 200 mg/ dm 3 . The application of magnesium methylphosphite as steel corrosion inhibitor is given in papers (Dovhal et al., 2016; Kityk et al., 2021). It was shown that the efficiency of steel protection was 89-99% as the result of this inhibitor application. The inhibitor was also the solution stabilizer for sediment deposits. The objective of the paper is to develop effective non-toxic corrosion inhibitors based on food enterprises waste for the protection of technological and auxiliary equipment of food enterprises, as well as to determine the mechanism of their protective action. 2. Objectives and methods Non-toxic and environmentally friendly substances were investigated as corrosion inhibitors for equipment. We investigated anti-corrosion activity of the inhibitors developed by us on the basis of waste plant material - extracts prepared by the method of cabbage head maceration (infusion) (In-1) (Brassicaoleracea L. convar. capitata (L.) Alef. var. alba DC). The choice is related to the availability of raw materials and the availability of sulfur- and nitrogen containing compounds, as well as meeting the sanitary and hygienic requirements for inhibitors used in food industry. The authors of paper (Khoma et al., 2022) note that the leaves and seeds of Snow White white cabbage variety have the lowest content of sulfur-containing compounds. Raw materials were harvested in the fields of the