Electrochemical property and in vitro degradation of DCPD-PCL composite coating on the biodegradable Mg-Zn alloy

被引：21

作者：

Wang, Hongju ^{[1
]}

Zhao, Changli ^{[1
]}

Chen, Ying ^{[1
]}

Li, Jianan ^{[1
]}

Zhang, Xiaonong ^{[1
]}

机构：

[1] Shanghai Jiao Tong Univ, State Key Lab Met Matrix Composites, Inst Biomed Mat, Sch Mat Sci & Engn, Shanghai 200240, Peoples R China

来源：

MATERIALS LETTERS | 2012年 / 68卷

关键词：

DCPD; PCL; Coating; Mg; Corrosion; Biomaterials; MAGNESIUM ALLOY; ELECTRODEPOSITION; BEHAVIOR;

D O I：

10.1016/j.matlet.2011.11.029

中图分类号：

T [工业技术];

学科分类号：

120111 [工业工程];

摘要：

In this study, dicalcium phosphate dihydrate (DCPD) and polycaprolactone (PCL) were successively prepared on a Mg-Zn alloy to obtain a composite coating. Electrochemical measurement showed that the corrosion potential (E-corr) of the DCPD-PCL coated alloy increased by 0.14 V compared to that of the DCPD coated alloy. The corrosion current (i(corr)) was about one third of the DCPD coated alloy. The real impedance (Z(re)) of the DCPD-PCL coated alloy was approximately 4 times as large as that of the DCPD coated one. The immersion test implied that the integrity of the DCPD-PCL composite coating kept better in the m-SBF after 260 h immersion than the DCPD coating. The less released hydrogen indicated that the degradation rate was reduced compared to the DCPD coated alloy. The degradation rate rapidly increased after 150 h for the DCPD coated alloy while 225 h for the DCPD-PCL coated case which meant the composite coating could retard the corrosion for a longer time. Therefore, the composite coating can protect the Mg alloy more efficiently. (C) 2011 Elsevier B.V. All rights reserved.

引用

页码：435 / 438

页数：4

共 14 条

[1]

Interaction between a high purity magnesium surface and PCL and PLA coatings during dynamic degradation [J].