There has been an increasing demand for high-strength aluminum alloys (2xxx, 6XXX, and 7XXX) using Laser- based powder bed fusion (L-PBF), especially in the aerospace, automotive, and energy sector. However, these alloys have a large solidification range, which leads to hot tearing at columnar grains. Given this context, recent results have shown that adding alloy elements - such as Ti and Zr [1,2], and the Al5TiB grain[3] refiner - effectively provides heterogeneous nucleation sites for the primary aluminum phase, thus achieving the crack-free equiaxed refined grain microstructure in the L-PBF samples. In this work, AA 2017 powder was blended with 2wt% of Al5Nb0.5B inoculant, a newly developed grain refiner for Al alloys, to avoid the formation of hot tearing in L-PBF, to suppress the epitaxial growth, and to assess its role in improving corrosion resistance. The blending of 2 wt% Al5Nb0.5B inoculant into AA 2017 produced by L-PBF led to columnar to equiaxial transition and significant grain refinement. However, polarization tests carried out at 0.1M NaCl showed that neither Ecorr nor passivation plateau were affected, staying around 5.10-3µAcm-2, while icorr was slightly reduced. Although further long–term corrosion tests need to be conducted, the AlNbB inoculant did not show deleterious effects on alloy´s corrosion resistance.