材料期刊网

Processing of a Novel Zn Alloy Micro-Tube for Biodegradable Vascular Stent Application

Wang Chang , Yu Zhentao , Cui Yajun , Zhang Yafeng , Yu Sen , Qu Gongqi , Gong Haibo

材料科学技术（英） doi:10.1016/j.jmst.2016.08.008

In recent years, zinc based alloys as a new biodegradable metal material aroused intensive interests. However, the processing of Zn alloys micro-tubes (named slender-diameter and thin-walled tubes) is very difficult due to their HCP crystal structure and unfavorable mechanical properties. This study aimed to develop a novel technique to produce micro-tube of Zn alloy with good performance for biodegradable vascular stent application. In the present work, a processing method that combined drilling, cold rolling and optimized drawing was proposed to produce the novel Zn-5Mg-1Fe (wt%) alloy micro-tubes. The micro-tube with outer diameter of 2.5?mm and thickness of 130?μm was fabricated by this method and its dimension errors are within 10?μm. The micro-tube exhibits a fine and homogeneous microstructure, and the ultimate tensile strength and ductility are more than 220?MPa and 20% respectively. In addition, the micro-tube and stents of Zn alloy exhibit superior in vitro corrosion and expansion performance. It could be concluded that the novel Zn alloy micro-tube fabricated by above method might be a promising candidate material for biodegradable stent.

关键词: Zn alloy , Micro-tube , Biodegradable stent , Mechanical properties , Dimensional accuracy , In vitro corrosion performance

模拟溶液中Mn对Zn腐蚀的作用机制

周海波张波朱丽娟王俭秋韩恩厚柯伟

腐蚀科学与防护技术

    采用动电位极化、扫描电镜(SEM)和X光电子能谱分析(XPS)等技术研究了含0.4mass%Mn的Zn-0.4Mn合金在模拟海洋大气环境溶液（0.1 mol/L NaCl+0.1 mol/L Na₂SO₄+0.01 mol/L NaHCO₃）中的腐蚀行为.结果表明，Zn和Zn-0.4Mn合金上的腐蚀产物均以ZnO和Zn₅(CO₃)₂(OH)₆为主，但Zn-0.4Mn表层有更多的Zn5(CO₃)₂(OH)₆.Mn的作用是使腐蚀产物致密，并促进耐蚀腐蚀产物（Zn₅(CO₃)₂(OH)₆）的形成，从而显著提高Zn在此溶液中的耐蚀性能.

关键词: Zn合金 , Mn addition , corrosion , XPS

材料科学技术（英）

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