Effect of heat treatment on corrosion behaviour of magnesium alloy AZ91D in simulated body fluid
Effect of heat treatment on corrosion behaviour of magnesium alloy AZ91D in simulated body fluid
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DOI：
10.1016/j.corsci.2009.11.030
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发表时间：
2010-03
影响因子：
8.3
通讯作者：
W. Zhou;Tian Shen;N. Aung
中科院分区：
文献类型：
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作者：
W. Zhou;Tian Shen;N. Aung
本研究探索了通过热处理改善AZ 91 D镁合金腐蚀性能的方法，以应用于可降解生物相容性植入物。在37°C的模拟体液中使用浸泡和电化学测试研究热处理样品的耐腐蚀性。热处理显著影响阴极β-Mg 17 Al 12相与阳极α-Mg基体之间的微电偶腐蚀行为。在T4组织中，β-Mg 17 Al 12相的溶解降低了阴阳极面积比，加速了α-Mg基体的腐蚀。T6组织中细小的β-Mg 17 Al 12析出相有利于晶间腐蚀和点蚀，但腐蚀速率低于铸态和T4组织。
The research explored ways of improving corrosion behaviour of AZ91D magnesium alloy through heat treatment for degradable biocompatible implant application. Corrosion resistance of heat-treated samples is studied in simulated body fluid at 37°C using immersion and electrochemical testing. Heat treatment significantly affected microgalvanic corrosion behaviour between cathodic β-Mg17Al12phase and anodic α-Mg matrix. In T4 microstructure, dissolution of the β-Mg17Al12phase decreased the cathode-to-anode area ratio, leading to accelerated corrosion of α-Mg matrix. Fine β-Mg17Al12precipitates in T6 microstructure facilitated intergranular corrosion and pitting, but the rate of corrosion was less than those of as-cast and T4 microstructures.