Development of new erosion-corrosion resistant cupronickel alloys

Two series of erosion-corrosion resistant cupronickel alloys, 16Ni and 30Ni series, were developed. Erosion-corrosion resistant cupronickel alloys of 30Ni series was based on 70Cu-30Ni alloy and added Cr, Al and trace amount of boron. Erosion-corrosion resistant cupronickel alloys of 16Ni series was composed of about 16% Ni, 5% Mn and small amount of Fe, Cr, Al elements. Compared with 70Cu-30Ni and 90CulONi alloys, these new cupronickel alloys have high strength, hardness and corrosion resistance, their corrosive wear and erosion-corrosion resistance were greatly improved without affecting its corrosion resistance and mechanical formability. The effect and optimum content of alloying elements were discussed.