Study on Wear Resistance of Polyurea Coating on Metal Structures of Lifting Machinery

In view of the problem that the metal structures of lifting machinery are easy to be aged and worn in harsh environment， the effects of coating thickness and load on the wear resistance of the coating on the surface of metal structure of crane were studied by using the newly formulated polyurea as spray material， and the wear mechanism of the coating was also discussed. Results showed that under certain conditions，when the coating thickness increased from 0 to 0.6mm，the wear amount and wear rate of the substrate were significantly reduced，and the polyurea coating significantly improved the wear resistance of the metal structure. When other conditions were unchanged and the load was lower than 100 N， the wear resistance of polyurea coating was good. But when the load increased to 150 N， the wear resistance of polyurea coating decreased gradually and the wear amount was large. Under low load， the main wear pattern of the coating was abrasive wear， and with the increase of load， the wear pattern was changed into adhesive wear.