Development and Research of Technology for Restoration and Strengthening of Worn Machine Parts by Composite Electroplating Coatings Using Micro - and Nanofractions Containing Tungsten-Containing Electroerosive Powders as the Strengthening Phase
The purpose. To develop and research a new technology for restoring and strengthening worn machine parts with composite electroplating coatings using micro - and nanofractionated tungsten-containing electroerosive powders as the strengthening phase. Methods. When setting up the experiments, a sample was used - a metal circle with a thickness of 5 mm and a diameter of 50 mm. The area of the side on which the coating was applied is 0.1963 . The composition of the electrolyte used in the experiments: iron sulfate 450 g / l; sodium chloride 250 g/l; temperature 100℃; current density 20 A/ ; current output 90-98%. Transformer steel plates were used as anodes. The plates have an easy-to-use shape, are accessible, and have a chemical composition close to pure iron. Hard-alloy powders of micro-and nanofractions were obtained on an electrodispersion unit (Patent for invention of the Russian Federation No. 2449859) from the waste of the T30K4 alloy in water. Results. When setting up the experiments, a coating was applied using a standard composition, and then a coating with the addition of an electroerosive powder obtained from a T30K4 hard alloy in an amount of 5 g/l of the solution. The structure and properties of the resulting composite electroplating coatings were investigated as a result of the research aimed at improving the technology of restoring automotive parts by the method of ironizing by introducing a strengthening additive based on electroerosive materials into the electrolyte. The results obtained in the course of the work make it possible to obtain composite electroplating coatings based on sulfuric acid electrolytes with the addition of a powder material obtained by the EED method from the T30K4 alloy. Conclusion. The study of composite electroplating is an important and relevant topic. This type of coating has many advantages over the classic, single-component coatings. The introduction of special additives in the electrolyte makes it possible to increase the strength of coatings, their resistance to high temperatures, increases their resistance to long-term operation in conditions of oil starvation, some types of composite electroplating coatings can also give the surface dirt-repellent properties.