Optimization of the Process of Electrodeposition of Composite Coatings from Electrolytes-Suspensions

Purpose. Optimization of the process of electrodeposition of composite coatings from electrolytes-suspensions by the microhardness of coatings.

Methods. The wear-resistant powder for the electrolyte-suspension was obtained by electrodispersing waste of highspeed steel grade P6M5 in a liquid working medium. Electrodeposition of composite coatings from electrolytes-suspensions with the addition of electroerosive powders obtained from waste of high-speed steel grade P6M5 was carried out at the galvanic installation L1 DIGIT (Italy). Optimization of the process of electrodeposition of the electroerosion charge by microhardness was carried out by setting up a complete factor experiment and the method of steep ascent of Box and Wilson. The adequacy of the equations was checked using the Fisher criterion. Regression equations were checked for adequacy. The resulting equations were used to calculate the steep ascent along the response surface. Results. Based on the conducted experimental studies aimed at optimizing the process of electrodeposition of composite coatings from electrolytes-suspensions, the high efficiency of the use of electroerosive powders obtained from waste high-speed steel grade P6M5 as a hardening phase, which provides at low energy costs the production of wearresistant coatings suitable for practical use.

The limiting values of the optimization parameter y (microhardness) of 0.726 GPa at a current density of 20 A/dm², a deposition time of 60 minutes and a concentration of 5 g/l were experimentally determined for the ironification process. Conclusion. The conducted research will solve the problem of restoration and hardening of parts operating under conditions of intense wear by electrodeposition of composite coatings from electrolytes-suspensions. Practical examples of the implementation of the developed technology of electrodeposition of composite coatings from electrolytessuspensions with powders obtained by electroerosive dispersion of metal waste have shown that coatings with a dispersed phase have unique properties and can be used to solve a variety of tasks.

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