Abstract: Laser powder bed fusion (LPBF) technology is a significant method for the fabrication of tailored porous pure molybdenum (Mo) structures. However, LPBF-fabricated pure Mo samples still exhibit issues such as excessive surface roughness and poor corrosion resistance. Electrochemical polishing (ECP) is the primary ecologically friendly post-treatment method for LPBF-fabricated pure Mo. The effects of various ECP polishing states on the surface roughness and degradation characteristics of LPBF-fabricated pure Mo were investigated. These findings indicated that the sample's surface roughness was decreased dramatically from 4.55 μm to 1.05 μm by electrochemical polishing. The polished sample's corrosion current density was 78.4% lower than that of the original. Weight loss rates varied from large to small in the following order: original state>semi-polished>polished. The weight loss rate progressively rised with the increasing immersion duration. Local acidification was eliminated due to a pH fluctuation value of ≤0.5 in the solution during the degradation process, complying with the requirements of biomedical materials. In this study, an essential theoretical foundation was offered for logically controlling the degrading behavior and rate uniformity of its implants by ECP surface application of Mo-based materials.
Keywords: Pure Mo; laser powder bed melting; electrochemical polishing; degradation behavior