缝隙腐蚀对Fe-30Mn-1C合金降解速率的影响

doi:10.11900/0412.1961.2017.00451

金属学报

2018, Vol. 54

Issue (7): 1010-1018 DOI: 10.11900/0412.1961.2017.00451

本期目录 | 过刊浏览

缝隙腐蚀对Fe-30Mn-1C合金降解速率的影响

马政, 陆喜, 高明, 谭丽丽(

), 杨柯

中国科学院金属研究所沈阳 110016

Effect of Crevice Corrosion on the Degradation Rate ofFe-30Mn-1C Alloy

Zheng MA, Xi LU, Ming GAO, Lili TAN(

), Ke YANG

Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

引用本文:

马政, 陆喜, 高明, 谭丽丽, 杨柯. 缝隙腐蚀对Fe-30Mn-1C合金降解速率的影响[J]. 金属学报, 2018, 54(7): 1010-1018.
Zheng MA, Xi LU, Ming GAO, Lili TAN, Ke YANG. Effect of Crevice Corrosion on the Degradation Rate ofFe-30Mn-1C Alloy[J]. Acta Metall Sin, 2018, 54(7): 1010-1018.

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摘要:

为了提高Fe-30Mn-1C合金的降解速率,采用激光技术,在样品上分别加工不同孔径的孔隙,将支架的设计与缝隙腐蚀结合起来,通过体外浸泡失重实验和电化学测试,研究了合金的降解行为,结果表明缝隙腐蚀可显著提高Fe-30Mn-1C合金的降解速率。

关键词 ：铁基合金, 可降解, 缝隙腐蚀, 心血管支架

Abstract：

Fe-30Mn-1C alloy has great potential to become degradable cardiovascular stent material due to its degradability, excellent comprehensive mechanical properties and biocompatibility. In this work, in order to improve the degradation rate of Fe-30Mn-1C alloy, laser technology was used to process pores with different pore diameters on the samples, and the design of the scaffold was combined with crevice corrosion. The degradation behavior of the alloy was studied through in vitro soaking weight loss experiments and electrochemical tests. The results showed that crevice corrosion can increase the degradation rate of Fe-30Mn-1C alloy significantly.

Key words： iron-based alloy biodegradable crevice corrosion cardiovascular stent

收稿日期: 2017-10-27

ZTFLH:

R318.08

基金资助:国家重点基础研究发展计划项目Nos.2012CB619101和2012CB619102,国家高技术研究发展计划项目No.2015AA033701

作者简介:

作者简介马政,男,1985年出生,博士

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https://www.ams.org.cn/CN/10.11900/0412.1961.2017.00451 或 https://www.ams.org.cn/CN/Y2018/V54/I7/1010

图1 Fe-30Mn-1C合金孔隙结构激光加工示意图

图2 Fe-30Mn-1C合金在Hank’s溶液中的降解速率

图3 不同孔径的Fe-30Mn-1C在Hank’s溶液中降解速率的增幅

图4 含不同大小孔径的Fe-30Mn-1C合金在Hank’s溶液中的宏观腐蚀形貌

图5 不同孔径的Fe-30Mn-1C合金在Hank’s溶液中的腐蚀形貌SEM像(酸洗前)

图6 不同孔径的Fe-30Mn-1C合金在Hank’s溶液中的腐蚀形貌SEM像 (酸洗后)

图7 Fe-30Mn-1C合金在Hank’s溶液中浸泡后的沉积层成分EDS结果

图8 含孔隙结构的Fe-30Mn-1C合金浸泡后的截面形貌及EDS面扫分析

图9 含不同大小孔径的Fe-30Mn-1C合金在Hank’s溶液中的截面腐蚀形貌

表1 不同孔径的Fe-30Mn-1C样品表面积

图10 含孔隙结构的Fe-30Mn-1C合金浸泡过程的降解机制示意图

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