Enhancing the erosion-corrosion resistance of cupronickel alloy through grain boundary engineering

The grain boundary engineering (GBE) effect on the erosion-corrosion resistance of 90/10 cupronickel alloys was studied using a self-made erosion-corrosion device. A 90/10 cupronickel alloy with abundant low-sigma coincidence site lattice grain boundaries and random grain boundary disconnectivity was fabricated through GBE. The average corrosion rate of the self-prepared alloy was reduced by 34 % to 0.0414 mm/a after the ero-sion-corrosion test. The corrosion product films of both samples included Cu, Cu2O, Ni(OH)2, NiO, FeO, FeOOH, and trace amounts of Cu2(OH)3Cl. A schematic diagram of the intergranular corrosion mechanism during the erosion-corrosion test was prepared.

Automated summary

The study investigated the effect of grain boundary engineering (GBE) on the erosion-corrosion resistance of 90/10 cupronickel alloys using a self-made erosion-corrosion device. A 90/10 cupronickel alloy with abundant low-sigma coincidence site lattice grain boundaries and random grain boundary disconnectivity was fabricated through GBE. The average corrosion rate of the self-prepared alloy was reduced by 34% to 0.0414 mm/a after the erosion-corrosion test. The corrosion product films of both samples included Cu, Cu2O, Ni(OH)2, NiO, FeO, FeOOH, and trace amounts of Cu2(OH)3Cl. A schematic diagram of the intergranular corrosion mechanism during the erosion-corrosion test was prepared.