Abstract: Ni-Al alloy and Ni-Cu alloy coatings were prepared on the surface of Q235 steel substrate by arc spraying technology. The phase, element composition and surface morphology, as well as the friction and wear behavior and corrosion behavior in simulated seawater medium of the two Ni based alloy coatings were characterized and compared. The results show that Ni-Al alloy and Ni-Cu alloy coatings are mainly composed of Ni based solid solution phase, the surface of the coatings has micropore, and the grain is relatively coarse. Ni-Al alloy coating has a small amount of continuous distribution of oxide phase, while Ni-Cu alloy coating contains a small amount of dispersive distribution of Cu_0.85Si_0.17second phase, and no obvious oxidation occurs. The hardness of Ni-Al alloy coating is slightly higher than that of Ni-Cu alloy coating, and its wear resistance is slightly better than that of Ni-Cu alloy coating. However, the anti-corrosion performance is poor during the friction process. The corrosion process of arc sprayed Ni-Al coating is continuous due to the existence of micropores, which is not conducive to the comprehensive improvement of corrosion resistance. The corrosion productions in the Ni-Cu alloy coating can form a protective layer on the coating surface and hinder its corrosion process, which achieve comprehensive improvement of corrosion resistance.