Experimental investigation of slurry erosion characteristics of laser treated nickel aluminum bronze

A review of the corrosion behavior of conventional and additively manufactured nickel–aluminum bronze (NAB) alloys: current status and future challenges

“…This observation was further supported by the improved erosion-corrosion resistance of laser surface treated NABs. 126 It was also found that there exists a linear relationship between the cavitation erosion mass loss and mechanical properties of NABs (i.e., hardness, yield strength, and ultimate tensile strength), where higher mechanical characteristics cause less cavitation erosion damage. 129 Thus, FSPed NAB alloys 94,96,97,[127][128][129][130]135 have exhibited superior cavitation erosion resistance compared to the as-cast counterpart.…”

“…This observation was further supported by the improved erosion–corrosion resistance of laser surface treated NABs. 126…”

“…Nonetheless, the laser surface treated NAB alloy with a Widmanstatten microstructure and higher hardness exhibited improved slurry erosion properties. 126 The acidity of the corrosive environment was also identified as a contributing factor to erosion–corrosion, and it was delineated that the pH value for the medium beneath the corrosion product film accumulating on the Cu-rich α phase (anode) within the eutectoid microstructure (α + κ III ) might drop below 4. In this case, the α phase no longer acted as an anode and κ III was selectively attacked, thereby aggravating the corrosion.…”

“…125 Another study aimed to investigate the beneficial effect of surface treatment using a pulsed Nd-YAG laser on the erosioncorrosion behavior of NAB. 126 In the untreated alloy, selective phase attack initiated weak points where micro-cutting dominated the erosion-corrosion mechanism. Nonetheless, the laser surface treated NAB alloy with a Widmanstatten microstructure and higher hardness exhibited improved slurry erosion properties.…”

“…This suggests that the material's vulnerability and level of stress can be controlled by varying the mechanical properties of the alloy that govern localized types of corrosion. Previous reports imply that improving the mechanical characteristics of NAB originating from alloy hardening (through grain refinement, 103,125 higher phase fraction of hard phases (b 0 and k phases 89 as well as Widmanstatten microstructure 126 ), and composite reinforcement material 100 ) can boost the corrosion resistance of NAB.…”