PSI - Issue 59

Igor Stadnyk et al. / Procedia Structural Integrity 59 (2024) 679–686 Igor Stadnyk et al./ Structural Integrity Procedia 00 (2023) 000 – 000

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rate. The nature of the films will be determined by the chemical properties of the environment, its composition, and the presence of dissolved oxygen and other gases. The intensity of corrosion processes is determined by the density, adhesion of the films relative to the metal, and wear resistance (Khaburskyi 2015; Karpenko 1986). Hydrodynamic operating conditions of circulation circuit systems in devices contribute not only to corrosion and salt deposition, but also to corrosion-fatigue failure (Slobodian et al., 2015). In practice, protection against corrosion and salt deposition in such systems is successfully solved by applying inhibitors. However, not all inhibitors of these processes are effective in the presence of cyclic loads. In addition, sometimes, their protective effect is obvious only at much higher concentrations than those commonly used in corrosion and salt deposition conditions. One of the ways to reduce the corrosion resistance of coatings is their thickness reduction. Thin coatings have strength without exhibiting brittle properties but have short durability. Applying the principle of multilayer protective coatings requires compliance with the necessary thickness to prevent the surface layer brittleness. Based on this, 2 approaches to coating are currently being considered. The first one is multi-layer, where each layer performs its own function to ensure the physical and mechanical properties of the coating. The second one is the creation of multi-component layers of mixed composition along the coating thickness, decreasing its reliability level. However, negative consequences should also be programmed, for example, according to the values of osmotic pressures, double and triple effects of factors, deterioration of product quality indicators, etc. Evaluating the effects of factor compositions is even more difficult. While the effect of temperature can be carefully monitored, there is no complete point of view regarding physical pressure (Karpenko 1986; Slobodian et al., 2015; Striletskyi et al., 2010). However, the provisions of thermodynamics closely connect the parameters of pressure and temperature, in the gas laws, Mendeleev-Clayperon equation, Henry's law, etc. During corrosive-mechanical wear, aggressive environment can intensify the destruction process of metal friction surfaces due to the decrease of their surface energy caused by physical and chemical adsorption of various chemical and surface-active substances in the environment, i. e., due to the implementation of Rebinder effect (Dzyub et al., 2014). Mechanism of material corrosion-mechanical wear in aggressive environments- food industry electrolytes can be described based on thermodynamic systems analysis. They make it possible to relate the macroscopic parameters of the device surface with electrochemical characteristics of interaction and destruction in a technological environment. Compatible quantitative analysis of the medium flow on corrosion wear mechanism can be determined using universal energy criteria applying methods of thermodynamics of irreversible processes. Such processes are described by means of dissipative function (Novitskiy 1984). ∑ ̄ (1) where is the dissipative function (rate of energy dissipation in the system) is assigned to the unit of contact surface ; Т is system temperature; ̄ is system entropy change; ̄ is the rate of energy dissipation for the i-process implemented in the system; ̄ is chemical reaction power; is chemical reaction rate; is chemical affinity of the reaction. It can be seen from this equation that the rate of corrosive-mechanical wear depends linearly on the load and sliding speed and parabolically on the material weakening by corrosive-active environment. The objective of the paper is to investigate the corrosion effect on the metal (copper plate) of the inhibitor and to calculate the change in the energy dissipation potential during heating of the environment using the methods of irreversible processes thermodynamics. 3. Objects and methods of investigation Non-toxic The influence of the inhibitor on corrosion - hydroerosion wear of the device surface in starch-containing environment was studied according to the well-known method (Dzyub et al., 2014). The inhibitor concentration was 0.2; 0.4; 0.8 and 2 g/l. Non-toxic corrosion inhibitor IGH -3 was used, wt.%: 0.2 protein sediment + 0.13 calcium hydroxide with the degree of carbon steel protection in tap water of 99.1%. It creates the film on the surface not only on anode, but also on cathode areas and is mixed-action inhibitor (Suhenko 2015). Determination of the corrosion effect on the copper plate was carried out in accordance with ASTM D 130-10 k S