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Metals 2019, 9(2), 117; https://doi.org/10.3390/met9020117

Acetic Acid Etching of Mg-xGd Alloys

1
Helmholtz-Zentrum Geesthacht, Institute of Materials Research, 21502 Geesthacht, Germany
2
Karlsruhe Institute of Technology (KIT), Institute of Functional Interfaces, Karlsruhe Nano Micro Facility, 76344 Eggenstein-Leopoldshafen, Germany
3
School of Computer Science, McGill University, Montréal, QC H3A 2T5, Canada
*
Author to whom correspondence should be addressed.
Received: 14 December 2018 / Revised: 16 January 2019 / Accepted: 21 January 2019 / Published: 23 January 2019
(This article belongs to the Special Issue Magnesium Alloys for Biomedical Applications)
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Abstract

Mg-xGd alloys show potential to be used for degradable implants. As rare earth containing alloys, they are also of special interest for wrought products. All applications from medical to engineering uses require a low and controlled degradation or corrosion rate without pitting. Impurities from fabrication or machining, like Fe inclusions, encourage pitting, which inhibits uniform material degradation. This work investigates a suitable etching method to remove surface contamination and to understand the influence of etching on surface morphology. Acetic acid (HAc) etching as chemical surface treatment has been used to remove contamination from the surface. Extruded Mg-xGd (x = 2, 5 and 10) discs were etched with 250 g/L HAc solution in a volume of 5 mL or 10 mL for different times. The microstructure in the near surface region was characterized. Surface characterization was done by SEM, EDS, interferometry, and ToF-SIMS (time-of-flight secondary ion mass spectrometry) analysis. Different etching kinetics were observed due to microstructure and the volume of etching solution. Gd rich particles and higher etching temperatures due to smaller etchant volumes promote the formation of pits. Removal of 2–9 µm of material from the surface was sufficient to remove surface Fe contamination and to result in a plain surface morphology. View Full-Text
Keywords: Mg-Gd alloy; surface treatments; acetic acid etching; surface characterization Mg-Gd alloy; surface treatments; acetic acid etching; surface characterization
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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 (CC BY 4.0).
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Gawlik, M.M.; Wiese, B.; Welle, A.; González, J.; Desharnais, V.; Harmuth, J.; Ebel, T.; Willumeit-Römer, R. Acetic Acid Etching of Mg-xGd Alloys. Metals 2019, 9, 117.

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