Substantiating Restoration of Bearings Mounting Area in Transport Transmission Shafts with Iron-Chrome Coatings

Introduction. During the operation of cars and other vehicles, the process of changing technical condition of parts and units takes place. With increased operation time and mileage, the failure rate increases, which leads to the problem of maintaining equipment in working condition through high-quality maintenance and repair. Parts repair has been a way to extend the service life of equipment by replacing or restoring the worn parts. Due to the problems of quality supply, the urgency of restoration becomes obvious. Numerous problems with high-quality spare parts cause the restoration as a way to overcome the above-mentioned problems. However, the restoration method should meet certain requirements, in particular, repair costs should not exceed 50% of the cost of a new part and durability should be at the level of 80-100% of the new part. Therefore, this article presents the results of research on a new method of restoring parts with iron-chromium coatings in order to maintain equipment in good condition.

Materials and methods. The investigation was based on literature analysis to study the restoration methods according to various criteria, such as durability, cost of use, wear resistance and other indicators. Also, based on a preliminary analysis, one of the promising methods was selected – iron-chromium coating. Preliminary research into the effect of acidity on the performance and quality of the coating has been carried out.

Results. The study of iron-chromium coating obtained from the composition of an electrolyte with 0.4-0.6 acidity has made it possible to obtain a coating with a sufficiently high microhardness (up to 8,500 MPa), current output (up to 40%) and deposition rate (up to 200 microns/hour). The resulting coating also has demonstrated a small number of microcracks, which made it possible to delay lubrication and provide increase in wear resistance.

Discussion and conclusion. As a result, the coating obtained has shown good physical and mechanical properties. Therefore, it will be possible to use this method to restore the mounting area of bearings in transmission shafts operating under abrasive wear.

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