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Corrosion behaviour of electropolished magnesium materials

  • Although magnesium and its alloys are promising candidates as biodegradable implant materials, the tendency for localized corrosion mechanism in physiological environment limit their biomedical application. Electropolishing is an attractive strategy for improving the corrosion behaviour of metals, but it is still largely unexplored in magnesium materials. In this study, the characterization of electropolished surfaces of AM50 and pure magnesium was performed, focussing on their in vitro degradation behaviour in cell medium. Corrosion rates were evaluated using potentiodynamic polarisation. The surface morphology before and after the onset of corrosion was investigated by scanning electron microscopy and confocal laser scanning microscopy. The presented electropolishing process led to improved surface performances, observable by significantly lower corrosion rates (0.08 mm·year-1 in Dulbecco's modified Eagle's medium), lower arithmetical mean height (0.05 µm), lower water contact angle (25-35°) and lower micro hardness (35-50 HV 0.1) compared to mechanically and chemically treated surfaces. MgO/Mg(OH)2 could be detected on electropolished surfaces. The localized corrosion mode could be reduced, but not entirely prevented. Electropolishing shows great potential as post-treatment of magnesium-based components, but detailed tests of the long-term corrosion behaviour are an important area of future research.

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Metadaten
Author:Jessica Kloiber, Ulrich Schultheiß, Lamborghini Sotelo, George Sarau, Silke Christiansen, Sarkis Gavras, Norbert Hort, Helga Hornberger
URN:urn:nbn:de:bvb:898-opus4-68254
DOI:https://doi.org/10.1016/j.mtcomm.2023.107983
Parent Title (English):Materials Today Communications
Publisher:Elsevier
Document Type:Article
Language:English
Year of first Publication:2023
Publishing Institution:Ostbayerische Technische Hochschule Regensburg
Release Date:2024/01/02
Tag:biomedical application; corrosion behaviour; electropolishing; magnesium alloy; pure magnesium; surface characterization
Article Number:107983
Edition:Journal Pre-proof
Note:
Corresponding author: Helga Hornberger
Institutes:Fakultät Maschinenbau
Fakultät Maschinenbau / Labor Biomaterialien
research focus:Produktion und Systeme
OpenAccess Publikationsweg:Hybrid Open Access - OA-Veröffentlichung in einer Subskriptionszeitschrift/-medium
Corresponding author der OTH Regensburg
Funding:Publikationsfonds der OTH Regensburg
Licence (German):Creative Commons - CC BY-NC-ND - Namensnennung - Nicht kommerziell - Keine Bearbeitungen 4.0 International