Simulated body fluid

Dislocation

Composite material

Metallurgy

Materials science

Corrosion

Scanning electron microscope

Selective laser melting

Pitting corrosion

Oxide

Grain boundary

Microstructure

Applied Surface Science

Recently, the stainless steels produced by selective laser melting (SLM) have received considerable attention in biomedicine, but their corrosion behaviors in the body environment are not revealed clearly up to now. In this study, the fundamental research on influences of microstructures on corrosion behavior of 316L stainless steel (316L SS) produced by SLM was conducted simulated body fluid (SBF). Higher densities of grain boundary, sub-grain boundary and dislocation resulted in a thicker passive film forming on SLM 316L SS comparing with that of wrought sample in SBF. Composition analyses of passive films revealed that the excessive thickness was the outer layer. No sulfide and dislocation tangling around oxide inclusions in SLM 316L SS contributed to a 0.205 V nobler pitting potential of SLM 316L SS than that of the wrought in SBF.

The enhancement of microstructure on the passive and pitting behaviors of selective laser melting 316L SS in simulated body fluid