Effects of secondary phase and grain size on the corrosion of biodegradable Mg-Zn-Ca alloys

被引：196
作者：
Lu, Y. [1 ]
Bradshaw, A. R. [1 ]
Chiu, Y. L. [1 ]
Jones, I. P. [1 ]
机构：
[1] Univ Birmingham, Sch Met & Mat, Birmingham B15 2TT, W Midlands, England
来源：
MATERIALS SCIENCE & ENGINEERING C-MATERIALS FOR BIOLOGICAL APPLICATIONS | 2015年 / 48卷
基金：
英国工程与自然科学研究理事会;
关键词：
Mg-Zn-Ca; Degradation; Microstructure; Heat treatment; MAGNESIUM ALLOYS; BEHAVIOR;
D O I：
10.1016/j.msec.2014.12.049
中图分类号：
TB3 [工程材料学]; R318.08 [生物材料学];
学科分类号：
0805 ; 080501 ; 080502 ;
摘要：
The bio-corrosion behaviour of Mg-3Zn-0.3Ca (wt.%) alloy in simulated body fluid (SBF) at 37 degrees C has been investigated using immersion testing and electrochemical measurements. Heat treatment has been used to alter the grain size and secondary phase volume fraction; the effects of these on the bio-corrosion behaviour of the alloy were then determined. The as-cast sample has the highest bio-corrosion rate due to niicro-galvanic corrosion between the eutectic product (Mg + Ca2Mg6Zn3) and the surrounding magnesium matrix. The bio-corrosion resistance of the alloy can be improved by heat treatment. The volume fraction of secondary phases and grain size are both key factors controlling the bio-corrosion rate of the alloy. The bio-corrosion rate increases with volume fraction of secondary phase. When this is lower than 0.8%, the dependence of bio-corrosion rate becomes noticeable: large grains corrode more quickly. (C) 2014 Elsevier B.V. All rights reserved.
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收藏
页码：480 / 486
页数：7
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