In vitro characterization of ZM21 mini-tube used for biodegradable metallic stent

• DOI: 10.1016/j.matlet.2017.09.092
• Publication Date: 2017-09-25T02:46:37Z
• Authors: Dong Bian; Jingjun Jiang; Weirui Zhou; Nan Li; Yufeng Zheng; Sander Leeflang; Jie Zhou
• Keywords: Degradation

Abstract Feasibility of a ZM21 mini-tube to be used as biodegradable stent applications was studied mainly focusing on its microstructure, mechanical property and corrosion behaviors. This mini-tube was composed of α-Mg, a small amount of Mn 0.815 Si 0.185 and possibly some undissolved Mn. Compressive yield strength, ultimate compressive strength and compressive strain of this mini-tube were 86.5 ± 4.9 MPa, 347.7 ± 15.0 MPa and 10.9 ± 0.4%, respectively. It exhibited decent corrosion resistance in Hank’s solution with a degradation rate of 0.26 mm/y. ZM21 mini-tube exhibited great potential to be used as biodegradable stents. But before that, localized corrosion should be well solved through impurity control and microstructure control.