Preda, L.; Leau, S.A.; Donath, C.; Neacsu, E.I.; Maxim, M.E.; Sătulu, V.; Paraschiv, A.; Marcu, M. Investigation of Long-Term Corrosion of CoCrMoW Alloys under Simulated Physiological Conditions. Metals2023, 13, 1881.
Preda, L.; Leau, S.A.; Donath, C.; Neacsu, E.I.; Maxim, M.E.; Sătulu, V.; Paraschiv, A.; Marcu, M. Investigation of Long-Term Corrosion of CoCrMoW Alloys under Simulated Physiological Conditions. Metals 2023, 13, 1881.
Preda, L.; Leau, S.A.; Donath, C.; Neacsu, E.I.; Maxim, M.E.; Sătulu, V.; Paraschiv, A.; Marcu, M. Investigation of Long-Term Corrosion of CoCrMoW Alloys under Simulated Physiological Conditions. Metals2023, 13, 1881.
Preda, L.; Leau, S.A.; Donath, C.; Neacsu, E.I.; Maxim, M.E.; Sătulu, V.; Paraschiv, A.; Marcu, M. Investigation of Long-Term Corrosion of CoCrMoW Alloys under Simulated Physiological Conditions. Metals 2023, 13, 1881.
Abstract
The corrosion resistance of two cast CoCr based alloys, with different amounts of chromium and with different alloying elements in the bulk composition of the alloy, was assessed. Herewith, we investigated the corrosion behavior of Co21Cr8Mo7W and Co29Cr7W by open circuit potential (OCP), potentiodynamic polarization (PP) and electrochemical impedance spectroscopy (EIS) in 0.1 M phosphate buffer solution (PBS) at 37°C for long time immersion. After 1000 hours of immersion, the corrosion current density (icor), estimated from anodic polarization tests, is lower for Co21Cr8Mo7W (i.e. 49 nA cm-2) alloy compared to Co29Cr7W alloy (180 nA cm-2). As regards the corrosion potential (Ecor), a nobler value was observed for Co21Cr8Mo7W (i.e. -59 mV vs. Ag/AgCl) compared to Co29Cr7W (i.e. -114 mV vs. Ag/AgCl). These findings suggest a better corrosion resistance of the film formed on the alloy containing lower amount of Cr and two alloying elements, namely Mo and W. These results are promising ones in terms of medical applications because they open new strategies in obtaining alloys with lower content of chromium and with higher protective properties against corrosion attack.
Keywords
corrosion; CoCr-based alloy; passive film biomaterials
Subject
Chemistry and Materials Science, Electrochemistry
Copyright:
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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