Study on wear and corrosion of the HVAF sprayed NICr-Cr3C2 coating after annealing
This paper presents the study of the microstructure, element distribution, and phase composition of the NiCr-Cr3C2 coating with the help of an X-ray spectrometer (EDS), X-ray diffractometer (XRD), MH-5LD microhardness tester, XMTD-7000 pin friction and wear tester, and CHI604C electrochemical analyzer. The wear resistance of the layer was analyzed. The results show that the strength of the adhesive NiCr coating layer annealed at 500 °C is higher than that of the non-adhesive layer due to the elimination of the residual stress. Due to the presence of a large amount of the hard ceramic phase of Cr3C2 in the coating, the melting point becomes high, resulting in a higher hardness of the entire NiCr-Cr3C2 coating. The adhesive layer NiCr is characterized with a more stable coefficient of friction after 500 °C annealing due to elimination of the residual stress within the coating. Combined with a higher strength, it suggests better wear resistance. According to the electrochemical test, the coating annealed at 500 °C tends to be less aggressive and exhibits better corrosion resistance.
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