Abstract
In this investigation, an iron-based powder mixed with tungsten carbide particles was applied by Plasma Transferred Arc welding (PTA) on the surface of the 20 G steel. The microstructure, chemical composition, hardness, wear resistance and corrosion resistance of the surfacing layer were analysed by means of optical microscope, scanning electron microscope, energy dispersive spectroscopy, x-ray diffraction, micro hardness tester, friction and wear tester and electrochemical workstation. The results show that the microstructure of the surfacing layer is mainly composed of dendrite, cellular crystal and inter dendritic eutectic structure. With the increase in Tungsten Carbide(WC) content, the hardness of the surfacing layer increases first and then decreases, and the hardness of 10% WC contents is the highest. The average friction coefficient of 10%WC surfacing layer is the lowest and the self-corrosion potential is the largest.
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