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Home > Archive>Volume 51, Issue 5, 2022 >1572-1581. DOI:10.12442/j.issn.1002-185X.20210826
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In-vitro Degradation Behavior of Mg-4.0Zn-0.2Mn-0.2Ca Micro-tube for Biodegradable Vascular Stent
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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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    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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[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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History
  • Received:September 17,2021
  • Revised:November 12,2021
  • Adopted:January 22,2022
  • Online: May 31,2022
  • Published: May 30,2022

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