首页|Revisiting the tolerance limit of Fe impurity in biodegradable magnesium

Revisiting the tolerance limit of Fe impurity in biodegradable magnesium

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  • NSTL
  • Elsevier
? 2022 Acta Materialia Inc.The existence of iron impurity in magnesium (Mg) is conventionally deemed detrimental to the corrosion resistance against the inorganic solutions, especially over its tolerance limit. We deliberately investigated the biodegradation properties of pure Mg with different contents of Fe by immersing in DMEM+10% FBS. Surprisingly, the impurity of Fe, even its content higher than the tolerance limit previously determined by immersion in inorganic solutions such as NaCl, has no negative effect on the degradation of pure Mg. Pure Mg with a high content of Fe impurity even retains good biocompatibility. Detailed microstructural analyses decipher that the severe local micro-galvanic corrosion caused by the Fe impurity meanwhile promotes the formation of compact Ca-rich corrosion product layer on the top surface, protecting the adjacent Mg matrix from being further corroded. The present discovery provides new insights in designing biodegradable Mg alloys, especially pursuing high-level impurity doping without deteriorating the biocompatibility.

BiocompatibilityCorrosion tolerance limitDegradationFe impurityMagnesium

Zhang Y.、Chen X.、Huang Y.、Luthringer-Feyerabend B.、Willumeit-Romer R.、Hort N.、Xue J.、Zander D.、Kainer K.U.

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Nano and Heterogeneous Materials Center School of Materials Science and Engineering Nanjing University of Science and Technology

Institute of Metallic Biomaterials Helmholtz-Zentrum Hereon

Department of Materials Science and Engineering Johns Hopkins University

Division of Materials Science and Engineering RWTH Aachen University

Chair of Light Elements Engineering Foundry and Automation Wroc?aw University of Science and Technology

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2022

10.1016/j.scriptamat.2022.114509

Scripta materialia

Scripta materialia

EISCI
ISSN：1359-6462
年,卷(期)：2022.212
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