Additive manufacturing (AM) technology of near-net shape parts is gaining even more importance in industry because it saves time, costs, and has very few limits in terms of geometries, with new design freedom and less scrap production compared with traditional processes.

In the present work, the corrosion resistance of aluminum alloys with 7 and 10% in chloride solutions obtained by the AM process known as Laser Powder Bed Fusion (LPBF) were evaluated. The results of anodic potentiodynamic tests and electrochemical spectroscopy impedance were studied in on both rough surfaces as produced by the LPBF technology and after mechanical polishing and passivation in air. The effect of heat treatments was also evaluated. The results show the worsening of the localized corrosion resistance for the alloy in the “as produced” conditions compared to polished and air passivated surface. The role of chloride concentration in the initiation of localized corrosion was confirmed. EIS spectra showed that the localized initiation occurs since early immersion for the as produced surface. On the contrary, the passive film on the polished specimens showed a higher resistance than the passive film formed during LPBF process. The initiation of corrosion takes place by the selective dissolution of the a-Al phase at the edge of the melting pool, stimulated by nobler precipitates, especially silicon based.