2，形成保護(hù)膜，阻礙腐蝕進(jìn)行。雖然Mg(OH)2膜上形成的羥基磷灰石（HA）可以進(jìn)一步降低腐蝕速率，但是鎂基體中粗大的第二相會(huì)增強(qiáng)電偶腐蝕效應(yīng)，并且生成的大量氫氣，從而破壞HA膜，使腐蝕繼續(xù)進(jìn)行。"/>

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可降解血管支架用Mg-4.0Zn-0.2Mn-0.2Ca微細(xì)管的體外降解行為
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作者單位:

北京工業(yè)大學(xué) 材料與制造學(xué)部，北京 100124

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基金項(xiàng)目:

國(guó)家重點(diǎn)基礎(chǔ)研究發(fā)展計(jì)劃(2016YFB0301101);北京市教委資助項(xiàng)目(KZ20180005005);國(guó)家自然科學(xué)基金(51801004);北京市自然科學(xué)基金(2192006)


In-vitro Degradation Behavior of Mg-4.0Zn-0.2Mn-0.2Ca Micro-tube for Biodegradable Vascular Stent
Author:
Affiliation:

Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing 100124, China

Fund Project:

National Key Research and Development Program of China (2016YFB0301101); Beijing Municipal Commission of Education Key Science and Technology Projects (KZ201810005005); National Natural Science Foundation of China (51801004); Beijing Natural Science Foundation, China (2192006)

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    摘要:

    通過(guò)浸泡實(shí)驗(yàn)和電化學(xué)測(cè)試研究了Mg-4.0Zn-0.2Mn-0.2Ca（質(zhì)量分?jǐn)?shù)）微細(xì)管的體外降解行為與腐蝕機(jī)理。結(jié)果表明，退火處理可以提高微細(xì)管的耐腐蝕性。長(zhǎng)期浸泡實(shí)驗(yàn)表明腐蝕過(guò)程相對(duì)均勻，退火微細(xì)管在Hank's溶液中的腐蝕速率約為0.30 mm/a。在浸泡初期，退火管材表面生成Mg(OH)2，形成保護(hù)膜，阻礙腐蝕進(jìn)行。雖然Mg(OH)2膜上形成的羥基磷灰石（HA）可以進(jìn)一步降低腐蝕速率，但是鎂基體中粗大的第二相會(huì)增強(qiáng)電偶腐蝕效應(yīng)，并且生成的大量氫氣，從而破壞HA膜，使腐蝕繼續(xù)進(jìn)行。

    Abstract:

    The in-vitro degradation behavior and corrosion mechanism of Mg-4.0Zn-0.2Mn-0.2Ca (wt%) micro-tube was investigated by the immersion tests and electrochemical tests. The results show that the corrosion resistance of the micro-tubes can be improved by the annealing treatment. The long-term immersion tests reveal that the corrosion process is relatively uniform, and the corrosion rate of the annealed micro-tube in Hank's solution is about 0.30 mm/a. During the initial stage of immersion, Mg(OH)2 is formed on the surface of the annealed micro-tubes, forming a protective film to hinder the corrosion progress. Although the formed hydroxyapatite (HA) on Mg(OH)2 film can further reduce the corrosion rate, the coarse secondary phases in Mg matrix can enhance the galvanic corrosion effect. The generated abundant hydrogen may destroy the HA film, thus promoting the corrosion process.

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引用本文

付軍健,杜文博,孫健,Adil Mansoor,劉軻,杜憲,李淑波.可降解血管支架用Mg-4.0Zn-0.2Mn-0.2Ca微細(xì)管的體外降解行為[J].稀有金屬材料與工程,2022,51(5):1572~1581.[Fu Junjian, Du Wenbo, Sun Jian, Adil Mansoor, Liu Ke, Du Xian, Li Shubo. In-vitro Degradation Behavior of Mg-4.0Zn-0.2Mn-0.2Ca Micro-tube for Biodegradable Vascular Stent[J]. Rare Metal Materials and Engineering,2022,51(5):1572~1581.]
DOI：10.12442/j. issn.1002-185X.20210826

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  • 收稿日期:2021-09-17
  • 最后修改日期:2021-11-12
  • 錄用日期:2022-01-22
  • 在線發(fā)布日期: 2022-05-31
  • 出版日期: 2022-05-30