Corrosion mechanism of amorphous alloy strengthened stainless steel composite by selective laser melting

Abstract The anti-corrosion behaviors of SLM-processed 316L stainless steel (SLMed-SS) with amorphous alloy additive (SLMed-composite) have been investigated, where the pitting of SLMed-composite is easy to be suppressed compared to that of SLMed-SS particularly once the pitting occurred. In addition, the pitting incubation time of SLMed-composite is confirmed to be longer than that of SLMed-SS by potentiostatic polarization under the same potential. More importantly, we confirm that the improved anti-corrosion properties are ascribed to the grain refinement and particularly the different passive film on SLMed-composite, which contains the yttrium oxide and solid solution of additional elements such as Cr and Mo.