A layer-by-layer assembled coating for improved stress corrosion cracking on biomedical magnesium alloy in cell culture medium

被引：27
作者：
Chen, Lianxi [1 ]
Tseng, Chuan-Ming [2 ,3 ]
Qiu, Youmin [1 ]
Yang, Junjie [1 ]
Chang, Chi-Lung [2 ,3 ]
Wang, Xiaojian [1 ]
Li, Wei [1 ]
机构：
[1] Jinan Univ, Inst Adv Wear & Corros Resistant & Funct Mat, Guangzhou 510632, Peoples R China
[2] Ming Chi Univ Technol, Dept Mat Engn, New Taipei 24301, Taiwan
[3] Ming Chi Univ Technol, Left Plasma & Thin Film Technol, New Taipei 24301, Taiwan
来源：
SURFACE & COATINGS TECHNOLOGY | 2020年 / 403卷
基金：
中国博士后科学基金;
关键词：
Biomedical Mg alloy; Layer-by-layer assembled coating; Phytic acid; Graphene oxide; Stress corrosion cracking; PHYTIC ACID; DEGRADATION BEHAVIOR; MG; ANTICORROSION; RESISTANCE; BIOCOMPATIBILITY; PRETREATMENT; MULTILAYER; SURFACE;
D O I：
10.1016/j.surfcoat.2020.126427
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Magnesium (Mg) alloys have shown great potential for biomedical implant materials due to their biodegradability and suitable mechanical strength. Recent works have shown that biomedical Mg alloys suffered from accelerated degradation rates when exposed to a stressed condition in biological media. Therefore, it is necessary to endow Mg alloys with enhanced stress corrosion cracking resistance. In this study, phytic acid (PA), branched polyethylenimine (bPEI) and graphene oxide (GO) were introduced onto Mg-1Zn alloy via layer-by-layer (LbL) assembly technique. The characteristics of the multilayer films were investigated by SEM, FTIR and XPS. Biodegradability Corrosion resistance of the samples was measured by electrochemical and immersion tests. The stress corrosion cracking (SCC) behaviour of the LbL coated Mg alloys was performed using slow strain rate tensile (SSRT) tests. The results showed that the multilayer coating with smooth and uniform morphologies could enhance the corrosion resistance of Mg alloys due to the physical barrier. The LbL coating exhibited a remarkable ability to improve the SCC resistance of Mg-1Zn alloy in Dulbecco's modified eagle medium.
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页数：12
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