Abstract:A duplex stainless steel coating containing Nb element was cladded on the 45# steel substrate by laser cladding technology. The scanning electron microscope (SEM) and energy dispersive spectrometer (EDS) were used to characterize the microstructure and elemental composition of the coating. The microhardness of the coating along the depth was tested. UMT friction and abrasion test was performed at 20℃ . The electrochemical test in 3.5 wt.% NaCl aqueous solution were conducted. The results show that the Nb element is added to the duplex stainless steel alloy powder for laser cladding. The carbides in the cladded layer are composed of Cr and Nb, and the Cr content is significantly reduced. With the addition of Nb, both hardness and abrasion resistance of the cladded layer are significantly improved compared with the layer without Nb. The cladded layer exhibited the best performance when Nb content is 1.4%. As the Nb content increases, the self-corrosion potential gradually increases, while the self-corrosion current density gradually decreases, indicating that the higher Nb content, the better the corrosion resistance of the cladded layer. In summary, when Nb content in the cladded layer is 1.4%, the cladded layer exhibited the best wear resistance and corrosion resistance performance.