Abstract
The corrosion behavior of selective laser melted Ti–6Al–4V alloy (SLM Ti–6Al–4V) was assessed in 0.1 M lactic acid + 0.1 M NaCl environment (pH 2.5) after 1150 hours of immersion at 37 °C and was compared with that of wrought Ti–6Al–4V alloy. Corrosion potential Ecor (Ecor = 0.083 ± 0.02 V) and corrosion current icor (icor = 0.145 ± 0.05 μA cm−2) of SLM Ti–6Al–4V alloy, estimated from anodic polarization tests, are under minimum recommended values for biomaterial surgical applications. Based on open-circuit potential (OCP) investigations, one may infer that this good corrosion resistance is due to the formation of a fast and stable protective oxide layer. According to X-ray photoelectron spectroscopy (XPS) results, this protective oxide layer is mainly formed from TiO2. From electrochemical impedance spectroscopy (EIS) investigations, a slightly lower corrosion resistance was observed at SLM Ti–6Al–4V alloy compared to the wrought one. Thus, the R1 associated with barrier film resistance of SLM Ti–6Al–4V is 339.1 kΩ cm2 whereas that one of wrought Ti–6Al–4V is 780.1 kΩ cm2. These results are conspicuous ones because they point out that SLM technique, which allows obtaining easily customized implants without expensive costs, is a valid alternative for obtaining new alloys for medical applications.
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Acknowledgments
This work was supported by Romanian Ministry of Research in the frame of National Project PN-III-P2-2.1-PED-2019 Contract No. 329PED/2020. Some investigations were performed within the framework of the “Electrochemical preparation and characterization of active materials with predetermined features” Research Project of the “Ilie Murgulescu” Institute of Physical Chemistry of the Romanian Academy. Contact angle measurements were performed using the research infrastructure acquired under POS-CCEO2.2.1 Project EU (ERDF) INFRANANOCHEM—No. 19/01.03.2009 and Romanian Government. The authors thank Dr. Alexandru Paraschiv, COMOTI—Romanian Research and Development Institute for Gas Turbines, Bucharest, Romania for SEM and EDS analysis.
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Banu, A., Preda, L., Marcu, M. et al. Electrochemical Behavior of SLM Ti–6Al–4V Alloy After Long Time of Immersion in Lactic Acid Environment. Metall Mater Trans A 53, 2060–2070 (2022). https://doi.org/10.1007/s11661-022-06648-8
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DOI: https://doi.org/10.1007/s11661-022-06648-8