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Acta Metall Sin  2018, Vol. 54 Issue (9): 1215-1235    DOI: 10.11900/0412.1961.2018.00032
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Biomedical Magnesium Alloys: Composition, Microstructure and Corrosion
Rongchang ZENG1(), Lanyue CUI1, Wei KE2
1 College of Materials Science and Engineering, Shandong University of Science and Technology, Qingdao 266590, China
2 Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China;
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Magnesium alloys, with good biocompatibility and mechanical-compatibility, can be developed as next generation promising biomaterials. This paper summerizes the principle and the cutting-edge advances of alloying of magnesium alloys as degradable biomaterials. The effects of alloy elements on the material and biological properties of magnesium alloys are analyzed. The focus is laid on the influence of microstructure (grain size, secondary phase or intermetallic compound, long-period stacking ordered (LPSO) phase and quasi-crystal phase), heat treatment and surface oxide film on degradation and their critical progress on corrosion morphology and mechanism. Several outlooks on bio-magnesium alloys are proposed.

Key words:  magnesium alloy      alloying      second phase      corrosion      biomaterial     
Received:  22 January 2018     
ZTFLH:  TG406  
Fund: Supported by National Natural Science Foundation of China (No.51571134) and Shandong University of Science and Technology Research Fund (No.2014TDJH104)

Cite this article: 

Rongchang ZENG, Lanyue CUI, Wei KE. Biomedical Magnesium Alloys: Composition, Microstructure and Corrosion. Acta Metall Sin, 2018, 54(9): 1215-1235.

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Fig.1  Relationship between corrosion current density and grain size (d) of the as-extruded ZK60 alloys
Fig.2  Effects of the grain size and twin crystal on the corrosion current density of the as-rolled AZ31 alloy
Fig.3  Schematic diagrams of the corrosion mechanisms of the as cast (a1~a4), T4- (b1~b4) and T6- (c1~c4 and d1, d2) treated Mg-Al-Gd alloys[102]
Fig.4  Schematic models of the corrosion attack occurring in the as-cast duplex structured Mg-Li alloys without I-phase (a) and with I-phase (b)[115]
Fig.5  Schematic diagram of the mechanism of natural formation of the oxide film on dual phase Mg-Li-Ca alloys[35]
Fig.6  Schematic diagram of the corrosion mechanism of dual phase Mg-Li-Ca alloys[35]
(a) the corrosion product film peeled off from the surface of the cast alloy due to the greater stress existing in the film, and thus fresh surface was exposed to the solution
(b) tubular paths in the oxide film on the extruded alloy were jammed and sealed by compounds such as LiOH, Mg(OH)2, CaCO3 and MgCO3
Fig.7  Model of pitting corrosion for Mg alloy AM60[62]
Fig.8  Microstructures (a, b), intergranular corrosion morphologies (c, d) and schematic diagram of intergranular corrosion (e) of magnesium alloy ZK60[50]
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