Özet:

We carried out the study on properties of coatings made of powder materials, which have a high wear and corrosion resistance, to increase durability of parts of diffusion apparatus, which operate in aggressive technological media of sugar beet production. We studied electrochemical properties of the selected coatings and determined the influence of temperature, composition of a technological medium of beet sugar production and electrochemical characteristics of coatings on processes of corrosion and mechanical wear of equipment parts. When the temperature of acidic diffusion juice increases, the electrode potential of friction surfaces moves to the negative side, corrosion currents increase, which indicates an increase in the rate of corrosion. A rate of electrochemical processes on friction surfaces determines the intensity of corrosion and mechanical wear of metals and protective coatings. One of the reasons for slowing down the intensity of wear of materials is the presence of sucrose in the solution. An increase in the concentration of sucrose in diffusion juice leads to the passivation of surfaces of friction of parts, increases the carrying capacity of sliding bearings and reduces the intensity of corrosion and mechanical wear. PN55Т45 coating has the highest corrosion resistance according to the obtained values of electrochemical characteristics and corrosion rates under conditions of corrosion and mechanical wear. We established that the intensity of wear of all coatings reduces with the increase in the load on a friction contact at the selected range, and the intensity of wear of all investigated coatings remains approximately the same at the maximum sliding rate. The highest wear resistance at low loads and sliding rates has PN85U15 covering. We can recommend all investigated protective coatings for the protection of parts in neutral technological media with abrasive wear. In particular, PN55Т45 coating can be used to protect cases and screws, and PN85U15 coating - to strengthen sliding bearings of diffusion apparatus. The study carried out makes possible to substantiate and rationally choose materials for strengthening of surfaces of equipment parts of sugar factories, which operate under conditions of active liquid medium under the action of corrosion and mechanical wear. Author Biographies Yuriy Sukhenko, National University of Life and Environmental Sciences of Ukraine Heroiv Oborony str., 15, Kyiv, Ukraine, 03041 Doctor of Technical Sciences, Professor, Head of DepartmentDepartment of Processes and equipment for processing of agricultural production

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