Abstract
The effect of different passivation times on the structure and properties of the passivated film of Inconel 718 alloy fabricated by laser powder bed fused (LPBF) was investigated by electrochemical techniques and surface analysis. The results delineated that the structure of the passive film changed from a p-type semiconductor to a p-n bilayer semiconductor structure with increasing film formation time; the thickness of the film increased from the initial 1.65 nm to 4 nm, which promoted a significant increase in polarization resistance. In the initial stage, the Cr2O3 nanoparticles of the passive film grow in interconnected aggregates. In contrast, in the termination stage, porous NiO nanoparticles are formed due to the dehydration precipitation of hydroxide.
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