Electropolishing of Magnesium Alloy Az31 with Varying Electrolyte Concentrations and Applied Potentials

  • Magnesium alloy AZ31 is a light material with a good mechanical stability and is used in various engineering applications. Although its tendency to localized corrosion is a limiting factor in its use. Electropolishing is a widely used process for improving the surface roughness and corrosion behavior of metals. However, there is a lack of knowledge about the electropolishing of magnesium and itsMagnesium alloy AZ31 is a light material with a good mechanical stability and is used in various engineering applications. Although its tendency to localized corrosion is a limiting factor in its use. Electropolishing is a widely used process for improving the surface roughness and corrosion behavior of metals. However, there is a lack of knowledge about the electropolishing of magnesium and its alloys. In this study, an optimal electropolishing process for AZ31 was developed to improve the surface properties by varying the electrolyte concentration and the applied potential. The electrolyte composition was a mixture of phosphoric acid, ethanol and deionized water. The applied potentials were selected based on measured current density potential curves. Thereby, electropolishing was performed up to an electric charge of 18 As. The experimental results indicate that the electropolishing process should be carried out at a low current density to avoid bubble evolution and surface defects. Therefore, the concentration of the electropolishing electrolyte should have an appropriate low conductivity, and the applied potential should be in the transient or passive region of the polarization curve recorded prior to electropolishing. It could be shown that an optimized electropolishing process improved the surface of AZ31 by providing a bright and mirror-like surface and a lower roughness compared to a mechanically ground surface.show moreshow less

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Metadaten
Author:Jessica Kloiber, Viktoria Anetsberger, Ulrich Schultheiss, Helga HornbergerORCiD
DOI:https://doi.org/10.2139/ssrn.4991311
Publisher:SSRN
Document Type:Preprint
Language:English
Year of first Publication:2024
Release Date:2024/12/05
Tag:AZ31; electrolyte; electropolishing; magnesium alloy; polarization curve; surface characterization
Institutes:Fakultät Maschinenbau
Fakultät Maschinenbau / Labor Biomaterialien
research focus:Produktion und Systeme
Licence (German):Keine Lizenz - Es gilt das deutsche Urheberrecht: § 53 UrhG
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