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

683

∑ ̄ ∑ ̄

5

(2)

In this case, the dissipative function of the process has the following form (Novitskiy 1984): ̄ ̄ where ̄ is dislocation flow density; movement of dislocations; is material weakening; is number of dislocations per unit of deformed material. Imagining the process of surface wear, the dissipative power of the process can be expressed as follows (Sokolenko et al., 2003; Novitskiy 1984): ∑ ̄ (3) where і -is the rate of change of free surface area of oxides and non-oxidized: and - accordingly, the formation of unit of new free surface of oxides and the starting material. Taking into account the above mentioned expressions, we can write: ̄ ̄ ̄ ̄ (4) All external work performed on the friction system (gravity of the medium on the devise surface) is as follows: (5) / a А    is chemical affinity of the process of formation and wher е is constant characterizing the fate of dissipated energy during wear; is the rate of relative sliding of medium particles on the friction surface. 4. Investigation results and their discussion It was noted (Korniy et al., 2021) that durability and operational reliability of food production equipment is directly related to the corrosion intensity. Determining the actual corrosion rate is of great importance for the correct selection of protective inhibitor that can be used under conditions of corrosive wear, as well as to identify the nature of this process. Kinetics of sugaring in the device is largely determined by the rate of formation of surface films (boundary layer), which is especially noticeable at temperatures and fast circulation circuits. When the process parameters increase, the rate of surface renewal gradually starts to decrease due to the increase in energy dissipation (dissipative function). The formation of new surfaces takes place. The values of the specific load P and the speed V characterize the external action on the surface of the wearing device, and the change in potential depends on the characteristics of the environment and the device material. By changing the potential of the process using external source (inhibitor), it is possible to control the corrosion wear process within certain limits. At the same time, without changing the load conditions of the device. The method of applying protective coatings with inhibitors of the technological environment has been confirmed by many researches (Suhenko et al., 2014). The results of analytical and experimental investigations confirm the adequacy of the dissipative function in this method. They also indicate that the technological environment can change the intensity of material wear tenfold (Suhenko 2015; Karpenko 1986; Korniy et al., 2021). In our case of surface corrosion wear, we can partially consider these dependencies. After all, there is more complex process where electrochemical dissolution serves as the catalyst for secondary destruction. In all of these processes, the potential of the system plays the role, which is not easy to determine under the influence of the circulating flow of the medium. where Р is specific load; is sliding friction coefficient; - friction path on the device surface. Accordingly, the energy dissipation has the following form: (6)