Effect of the Ca2Mg6Zn3 Phase on the Corrosion Behavior of Biodegradable Mg-4.0Zn-0.2Mn-xCa Alloys in Hank's Solution

被引:21
作者
Fu, Junjian [1 ]
Du, Wenbo [1 ]
Liu, Ke [1 ]
Du, Xian [1 ]
Zhao, Chenchen [1 ]
Liang, Hongxing [1 ]
Mansoor, Adil [1 ]
Li, Shubo [1 ]
Wang, Zhaohui [1 ]
机构
[1] Beijing Univ Technol, Fac Mat & Mfg, Beijing 100124, Peoples R China
基金
中国国家自然科学基金; 北京市自然科学基金;
关键词
Mg-Zn-Mn-Ca; Ca2Mg6Zn3; phase; corrosion behaviors; SKPFM; MICRO-GALVANIC CORROSION; MECHANICAL-PROPERTIES; MAGNESIUM ALLOYS; MN ALLOY; ZN; MICROSTRUCTURE; CA; ND; CYTOCOMPATIBILITY;
D O I
10.3390/ma15062079
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The effect of the Ca2Mg6Zn3 phase on the corrosion behavior of biodegradable Mg-4.0Zn-0.2Mn-xCa (ZM-xCa, x = 0.1, 0.3, 0.5 and 1.0 wt.%) alloys in Hank's solution was investigated with respect to phase spacing, morphology, distribution and volume fraction. With the increase in Ca addition, the volume fraction of the Ca2Mg6Zn3 phase increased from 2.5% to 7.6%, while its spacing declined monotonically from 43 mu m to 30 mu m. The Volta potentials of secondary phases relative to the Mg matrix were measured by using scanning kelvin probe force microscopy (SKPFM). The results show that the Volta potential of the intragranular spherical Ca2Mg6Zn3 phase (+109 mV) was higher than that of the dendritic Ca2Mg6Zn3 phase (+80 mV). It is suggested that the Ca2Mg6Zn3 acted as a cathode to accelerate the corrosion process due to the micro-galvanic effect. The corrosion preferred to occur around the spherical Ca2Mg6Zn3 phase at the early stage and developed into the intragranular region. The corrosion rate increased slightly with increasing Ca content from 0.1 wt.% to 0.5 wt.% because of the enhanced micro-galvanic corrosion effect. The decrease in the phase spacing and sharp increase in the secondary phase content resulted in a dramatic increase in the corrosion rate of the ZM-1.0Ca alloy.
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页数:13
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