A cobalt-free dual-phase FeCrNiMoSi high-entropy alloy coating with high wear and corrosion resistance compared with FeCoCrNi

FeCoCrNi-based high-entropy alloys (HEA) are utilized in offshore equipment, their inadequate balance of wear and corrosion resistance, coupled with the high proportion of precious metal elements (such as cobalt), restricts their applicability in corrosive and friction-wear multitasking environments. Here, a cobalt-free FeCrNiMoSi_x dual-phase coating was designed and prepared, and the investigation focused on the systematic examination of the coating's phase transition and characteristics in relation to silicon content. The FeCrNiMoSi_0.5 coating was determined to have optimum corrosion resistance, a phenomenon attributed to the synergistic effect of the dual phase structures. And, the hardness increased with the addition of Si, but the anti-wear properties displayed a pattern of initially rising and then falling, because variations in the concentrations of the different phases modify the wear mechanism.