Effect of fluoride coating on in vitro dynamic degradation of Mg-Zn alloy

被引：15

作者：

Chen, Ying ^{[1
]}

Song, Yang ^{[1
]}

Zhang, Shaoxiang ^{[1
]}

Li, Jianan ^{[1
]}

Wang, Hongju ^{[1
]}

Zhao, Changli ^{[1
]}

Zhang, Xiaonong ^{[1
]}

机构：

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

来源：

MATERIALS LETTERS | 2011年 / 65卷 / 17-18期

关键词：

Mg-Zn; Degradation; Fluoride; Coating; Electrochemical; Dynamic; CORONARY-ARTERIES; MAGNESIUM ALLOYS; CORROSION; BEHAVIOR; BIOCOMPATIBILITY; STENTS;

D O I：

10.1016/j.matlet.2011.05.108

中图分类号：

T [工业技术];

学科分类号：

120111 [工业工程];

摘要：

A compact and flat fluoride coating with some pores was prepared on a Mg-Zn alloy in order to control its degradation behavior. The electrochemical tests demonstrated that the real impedance (Z(re)) of the fluoride-coated Mg-Zn was approximately 10 times as large as that of the untreated alloy. The free corrosion potential (E(corr)), compared to that of the uncoated Mg-Zn alloy, increased 646 mV for the coated metal. The free corrosion current (I(corr)) of the Mg-Zn specimen with the fluoride film was about one tenth of that of the uncoated one. The in vitro dynamic degradation tests showed that the average weight loss of the fluoride-coated Mg-Zn was lower than that of the untreated alloy in the initial 4 h of the tests, indicating the film could function as a barrier coating on Mg-Zn matrix. However, the coating cracked and peeled severely after 4 h dynamic tests, which implied that the fluoride coating could not endure the sustaining washing of the modified simulated body fluid. (C) 2011 Elsevier B.V. All rights reserved.

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页码：2568 / 2571

页数：4

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