Erosion-corrosion behaviour of shot peening treated nickel-aluminium bronze in simulated sand-containing seawater

The effect of shot peening on the erosion-corrosion property of nickel-aluminium bronze was investigated. The results show that erosion-corrosion has a shot peening-like effect and thus increases the hardness and compressive residual stress. Shot peening alters the erosion-corrosion mechanism. With peening intensity increasing, the predominant reason for causing materials removal shifts progressively from ductile deformation coupled with selective phase corrosion to brittle cleavage-like fracture, highlighting the overriding role of strain-hardening capacity over hardness, compressive residual stress, and surface roughness in erosion-corrosion performance. However, the mass loss rate can be reduced by up to 30% by implementing appropriate peening intensity.