Microstructure and corrosion behavior of 316L stainless steel prepared using different additive manufacturing methods: A comparative study bringing insights into the impact of microstructure on their passivity

•AM 316 L microstructure consists of cells network with elemental enrichment at borders.•Cells border is highly corrosion resistant; limiting penetration of attack into metal.•Cells present on LMD specimens were about 10 times larger than those in SLM samples.•LMD, SLM and wrought 316 L had similar corrosion potential and passive current density.•Potential passivity range was found to be in the order: SLM > LMD > wrought material. This work compares the microstructure and corrosion resistance of 316 L stainless steel samples prepared using two different additive manufacturing methods: selective laser melting (SLM), and laser metal deposition (LMD). A wrought material was used as reference. The specimens showed marked differences in their microstructure, as a result of the specific manufacturing conditions. All samples displayed similar corrosion potential and passive current density values. However, variations were seen in their potential passive range (SLM > LMD > Wrought). The wider passivity of the SLM specimen can be associated with its finer microstructure, which leads to a more stable native oxide.