Microstructure and bio-corrosion behavior of Mg-Zn and Mg-Zn-Ca alloys for biomedical applications

被引：98
|
作者：
Bakhsheshi-Rad, H. R. [1 ]
Hamzah, E. [1 ]
Fereidouni-Lotfabadi, A. [1 ]
Daroonparvar, M. [1 ]
Yajid, M. A. M. [1 ]
Mezbahul-Islam, M. [2 ]
Kasiri-Asgarani, M. [3 ]
Medraj, M. [2 ]
机构：
[1] Univ Teknol Malaysia, Fac Mech Engn, Dept Mat Mfg & Ind Engn, Johor Baharu 81310, Malaysia
[2] Concordia Univ, Dept Mech Engn, Montreal, PQ H3G 1M8, Canada
[3] Islamic Azad Univ, Najafabad Branch, Dept Mat Engn, Najafabad, Isfahan, Iran
来源：
MATERIALS AND CORROSION-WERKSTOFFE UND KORROSION | 2014年 / 65卷 / 12期
关键词：
MAGNESIUM;
D O I：
10.1002/maco.201307588
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The microstructure and bio-corrosion behavior of binary Mg-xZn (x = 1.25, 2.5, 4) and ternary Mg-Ca-xZn (x = 1.25, 2.5, 4) alloys have been studied using scanning electron microscopy (SEM), electrochemical, and immersion tests. Microstructure analysis indicated that the binary Mg-Zn alloys are composed of primary alpha-Mg matrix and Mg12Zn13 phases, while, ternary Mg-Ca-Zn alloys are composed of alpha-Mg, Mg2Ca, and IM1 (Ca3MgxZn15-x) (4.6 <= x <= 12) phases or alpha-Mg, IM1 and IM3 (Ca2Mg5Zn13) phases. Electrochemical results showed that Mg-4Zn alloy has lowest corrosion rate among binary alloys. At constant Ca content of 0.8 wt.%, the addition of Zn up to 1.25 wt.% decreased the corrosion rate, while further addition of Zn increased the corrosion rate of ternary alloys. Immersion tests results demonstrated that the formation of Zn oxide layer in binary Mg-Zn alloy and evolution of eutectic phase (alpha-Mg+IM1+Mg2Ca) significantly retard the bio-degradation rate of the ternary alloys.
引用
收藏
页码：1178 / 1187
页数：10
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