<p>Ni625-xWC coatings were fabricated on 45 steel via laser cladding, and the effects of WC content on the microstructure, phase composition and hardnesswere analyzed using an ultra–depth field microscopy, x-ray diffraction, and hardness tester, respectively. The tribological performance and electrochemical behavior in 3.5% NaCl solution were systematically investigated, and the wear and corrosion mechanisms were also discussed in detail. The results indicate that the Ni625-xWC coatings are comprised of γ–(Fe,Ni), Ni-Cr-Co-Mo, WC, W₂C, Fe₃W₃C, Co₃W₃C and Fe₃Mo₃C phases, and their hardness is increased with the WC content, which is higher by 3-4 times than that of substrate. The average coefficients of friction of Ni625-0%WC, -15%WC, -30%WC and -45%WC coatings are 0.435, 0.525, 0.475, and 0.505, respectively, and the corresponding wear rates are 163.87, 86.03, 20.05, and 8.48 μm³·N⁻¹·s⁻¹, respectively, demonstrating that the Ni625-45%WC coating exhibits the highest wear resistance. The wear mechanism is transferred from abrasive wear + adhesive wear to abrasive wear + mild oxidation wear and finally to brittle spalling + oxidative wear, which is attributed to the improvement of coating hardness by the addition of WC. Furthermore, the corrosion resistance is deteriorated with the increase of WC content, and the Ni625-0%WC coating presents the best performance due to the WC–induced surface activation that accelerates the corrosion progress. This finding reveals the role of WC content in modulating the tribological and corrosion properties of Ni625 coatings, which fills the research gap regarding the balance between the wear resistance and the corrosion resistance.</p>