Corrosion behavior of wire-arc additive manufactured and as-cast Ni-Al bronze in 3.5 wt% NaCl solution

The wire-arc additive manufacturing (WAAM) was used to develop Ni-Al bronze (NAB) alloys for naval application. Compared with as-cast NAB, the microstructure of as-fabricated NAB is finer, the precipitation of the kappa I is suppressed, more uniform distribution of elements, and most beta '-phase transformates to alpha + kappa(III) eutectic structures. Additively manufactured sample reveals a lower corrosion current (0.0149 +/- 0.0014 mA center dot cm(-2)) than the counterpart (0.0162 +/- 0.004 mA center dot cm(-2)). After immersion for 30 days, since the film formed on the additively manufactured NAB contains more Al2O3 and Ni, the mass loss of WAAM-produced NAB alloys decreased by 35.21% compared to the cast samples.

Automated summary

The wire-arc additive manufacturing (WAAM) was used to develop Ni-Al bronze (NAB) alloys for naval application. The as-fabricated NAB exhibited finer microstructure, suppressed precipitation of kappa I, more uniform distribution of elements, and transformation of beta ' to alpha + kappa(III) eutectic structures. The corrosion current of additively manufactured samples was lower than the cast samples, and the mass loss of WAAM-produced NAB alloys decreased by 35.21% after immersion for 30 days due to the formation of Al2O3 and Ni film on the surface.