In order to study the influence of different substrate materials on the tribological properties of CrN/CrCN multilayer coatings in seawater environments,multiarc ion plating technology was used to deposit CrN and CrN/CrCN multilayer composite coatings on H65 copper alloy,TC4 titanium alloy and 316L stainless steel substrates.The structure of the coating was characterized by XRD,SEM.Hardness and friction tests were performed to test the mechanical and tribological properties of the coatings.The results show that the internal stress of the CrN/CrCN multilayer coating is obviously reduced compared with the CrN coating,and its hardness is higher than that of CrN coating.The coating with TC4 titanium alloy as substrate has good adhesion and high hardness.The friction coefficient of the coating is lower in seawater environment than that in atmosphere environment,and the friction coefficient of the coatings based on TC4 titanium alloy and 316L stainless steel substrates is smaller.The wear rate of CrN and CrN/CrCN coatings based on H65 copper alloy is higher in seawater than that in atmosphere,while the wear rate of CrN/CrCN multilayer coating based on TC4 alloy and 316L stainless steel substrates is lower in seawater than that in atmosphere.The multilayer coating on the TC4 titanium alloy substrate has the lowest wear rate in the seawater environment,which incidates that TC4 titanium alloy is more suitable as a wearresistant base material for CrN/CrCN multilayer coatings in seawater environment.