To improve the service performance of metal parts in harsh marine environment, the effects of SiC on the corrosion and wear resistance of the Ni-W Alloys were investigated by scanning electron microscopy (SEM), energy spectrum analysis (EDS) and X ray diffraction (XRD). The influences of SiC nanoparticles on Ni-W composite electrodeposition process and the electrochemical corrosion properties of Ni-W/SiC composite coatings were studied by EIS and Tafel methods. The results show that SiC which pretreated were uniformly dispersed in compact Ni-W/SiC coating which can effectively improve the hardness and wear resistance at the same time. The addition of W6+ refine the grain size of the Ni coating, reduce the porosity, transform some structure to amorphous and improve the corrosion resistance. SiC nano particles can promote the nucleation and growth of Ni-W alloy and improve the hardness of the alloys. Compared with Ni-W alloys, with the wear resistance increased and porosity decreased, Ni-W/SiC alloys have excellent corrosion resistance and wear resistance. Ni-W/SiC alloys also have better abrasion and corrosion resistance than Ni-W alloy, and can provide comprehensive service performance for marine parts under the influence of multifactor interaction in seawater environment. It has a good application prospect in the field of marine engineering protection.