Fig. 4: Representative corrosion morphology in the AM material after polarization tests up to 10−3 A/cm2.

a Overview of the site showing multiple individual cavities, elliptical in shape, clustered together into a large region, b high magnification SEM image of the region highlighted in purple in (a), showing the morphology of individual cavities, c high resolution BSE image of the region highlighted in yellow in (a), showing alignment of the cavities with the cellular solidification structures.