Manufacture of biodegradable magnesium alloy by high speed friction stir processing

被引：55
作者：
Qin, Dingqiang [1 ]
Shen, Haorui [1 ]
Shen, Zhikang [1 ,3 ]
Chen, Haiyan [1 ,2 ,3 ]
Fu, Li [1 ,2 ,3 ]
机构：
[1] Northwestern Polytech Univ, Sch Mat Sci & Engn, Xian 710072, Shaanxi, Peoples R China
[2] State Key Lab Solidificat, Xian 710072, Shaanxi, Peoples R China
[3] Shaanxi Key Lab Frict Welding Technol, Xian 710072, Shaanxi, Peoples R China
来源：
JOURNAL OF MANUFACTURING PROCESSES | 2018年 / 36卷
基金：
中国国家自然科学基金;
关键词：
Magnesium; Friction stir processing; Surface modification; Corrosion; Polarization; Electrochemical impedance spectroscopy; IN-VIVO CORROSION; MECHANICAL-PROPERTIES; OCTACALCIUM PHOSPHATE; ALUMINUM-ALLOY; GRAINED AZ91; BEHAVIOR; VITRO; MICROSTRUCTURE; RESISTANCE; BIOCOMPATIBILITY;
D O I：
10.1016/j.jmapro.2018.09.019
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Friction stir processing (FSP) with a high rotational speed (6000 rpm) was employed to modify surface properties of magnesium alloy through grain refinement and incorporated nano-hydroxyapatite (nHA) particles. Hardness testing indicated that the distributed nanoparticles have largely influenced the hardness of the surface layer and measurements of average hardness varied with different amounts of nHA particles applied. Corrosion tests revealed that FSP had reduced the corrosion rate of ZK60 magnesium alloy by more than one order of magnitude due to the combined effects of grain refinement and low surface energy. The corrosion rates of modified layers could be manipulated by nHA content of selection since nHA plays an important role in destroying the continuity of magnesium matrix and producing a more protective biomineralized film on composites when immersed in simulated body fluid (SBF). Two kinds of equivalent circuits were proposed to explain the corrosion mechanism. The simulation values fitted the experimental data very well by using the equivalent circuits, regardless of differences in samples.
引用
收藏
页码：22 / 32
页数：11
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