The　cemented　carbides　have　been　gradually　applied　for　marine　equipment　due　to　their　high　wear　resistance,　while　the　corrosive　impact　of　seawater　has　a　considerable　effect　on　its　wear　performance.　In　this　paper,　the　effect　of　Ni　concentration　on　the　resistance　to　corrosion,　tribological　properties,　and　microstructure　of　the　cemented　carbides　based　on　tungsten　carbide　(WC)　with　metal　binders　sliding　against　silicon　carbide　(SiC)　in　seawater　was　investigated.　The　results　showed　that　Ni　element　has　a　positive　effect　on　the　resistance　to　corrosion　of　cermet　WC,　and　the　resistance　to　corrosion　is　the　best　when　the　concentration　of　Ni　element　is　9%　(WC-9Ni).　In　addition,　the　coefficient　of　friction　(COF)　of　the　WC-hNi/SiC　tribopair　first　decreased　and　then　increased　with　the　increase　of　Ni　concentration,　and　the　quite　low　steady　COF　of　WC-9Ni　is　observed.　The　wear　mechanism　of　the　WC-hNi　balls　is　mainly　abrasive　wear,　and　the　corrosion　wear　is　mild.　Furthermore,　the　wear　rate　of　WC-9Ni　is　the　lowest　at　different　rotational　speeds,　which　has　great　application　potential　in　seawater　hydraulic　components.