Influence of Dy in solid solution on the degradation behavior of binary Mg-Dy alloys in cell culture medium

• Published in: Materials Science & Engineering C 2017-06, Vol.75, p.1351-1358
• Main Authors: Yang, Lei, Ma, Liangong, Huang, Yuanding, Feyerabend, Frank, Blawert, Carsten, Höche, Daniel, Willumeit-Römer, Regine, Zhang, Erlin, Kainer, Karl Ulrich, Hort, Norbert
• Format: Article
• Language: English
• Subjects: Alloying effects; Alloying elements; Alloys; Alloys - chemistry; Anodic dissolution; Binary alloys; Biodegradability; Biodegradable materials; Biodegradation; Cell culture; Corrosion; Corrosion resistance; Corrosion resistant alloys; Culture Media; Degradation; Dissolution; Dy distribution; Dysprosium - chemistry; Dysprosium base alloys; Electrochemical behavior; Implants; Magnesium; Magnesium - chemistry; Magnesium base alloys; Materials science; Mg-Dy alloys; Microstructure; Rare earth elements; Transplants & implants
• ISSN: 0928-4931; 1873-0191
• DOI: 10.1016/j.msec.2017.03.010

Rare earth element Dy is one of the promising alloying elements for magnesium alloy as biodegradable implants. To understand the effect of Dy in solid solution on the degradation of Mg-Dy alloys in simulated physiological conditions, the present work studied the microstructure and degradation behavior of Mg-Dy alloys in cell culture medium. It is found the corrosion resistance enhances with the increase of Dy content in solid solution in Mg. This can be attributed to the formation of a relatively more corrosion resistant Dy-enriched film which decreases the anodic dissolution of Mg. •Regions with Dy segregation are more corrosion resistant than Mg matrix in cell culture medium.•Corrosion resistance increases with increasing Dy content in solid solution.•Dy in solid solution does not alter cathodic reaction kinetics of Mg-Dy alloys.•Dy in solid solution decreases anodic reaction kinetics.