医用Mg-Zn-Ca合金在模拟体液中的腐蚀行为

Bio-corrosion Resistance of Mg-Zn-Ca Alloys

摘要:

利用铸造技术制备不同成分的医用Mg-Zn-Ca合金，在470 ℃对部分合金进行24 h的固溶处理。测试合金在模拟体液中的腐蚀行为。结果表明，合金经过固溶处理后其在模拟体液(hank’s)中的电化学自腐蚀电位均出现正偏移现象，耐浸泡腐蚀性能也有较大的提高。在模拟体液中，未经固溶处理合金中的最大腐蚀速率达到5.3265 mm/a，经过固溶处理后合金的最大腐蚀速率降低到0.8632 mm/a。说明固溶处理后合金具有较好的耐腐蚀性能

Abstract:

Mg-Zn-Ca alloys were prepared by a casting technique, and some of as-cast alloys were solution treated at 470 oC for 24 h. The corrosion resistance of the alloys in simulated body fluid was investigated. The results show that positive shift occurs in the electrochemical corrosion potential of solution treated alloys in the simulated body fluid (Hank’s). And the resistance to soak corrosion is also greatly improved. The maximum corrosion rate of as-cast alloys is 5.3265 mm/a in the simulated body fluid. After solution treatment the rate is reduced to 0.8632 mm/a. It indicates that after solution treatment, the alloy shows a better corrosion resistance