Additive manufacturing (AM) is capable of producing unique, complex structures rapidly. The fast local melting of metal AM parts cool quickly due to the small area, providing unique microstructures, pores, and larger surface roughness compared to cast. AM microstructures change mechanical and chemical properties, such as strength, toughness, and corrosion, compared to traditionally manufactured parts. Variations in build parameters and composition creates a complicated, feature dependent, corrosion response.
Mapping local corrosion, by scanning vibrating electrode technique (SVET), correlates position dependent local potential with ion concentrations.
<br>Corrosion events can be linked to features on the surface, including grains, particles on the surface, cracks, and/or material composition. An AM 316L parallelogram demonstrated skin dependent corrosion. In situ SVET measurements confirm the corrosion dependence on surface roughness features. Mechanisms of local corrosion will be discussed regarding surface features. The understanding of the contribution of corrosion causing features will inform print parameter selection.