Wang Chang
,
Yu Zhentao
,
Cui Yajun
,
Zhang Yafeng
,
Yu Sen
,
Qu Gongqi
,
Gong Haibo
材料科学技术（英文）
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
周海波张波朱丽娟王俭秋韩恩厚柯伟
腐蚀学报（英文）
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
