铸造镁合金Mg-Zn-Y-Zr-Ca在模拟体液中的腐蚀行为

doi:10.11896/j.issn.1005-023X.2017.024.021

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Abstract The microstructure of the as-cast Mg-3Zn-0.6Y-0.5Zr-0.3Ca alloy was observed by optical and scanning electron microscopy. The biocorrosion properties of the alloy in simulated body fluid (SBF) were evaluated using mass loss experiments with different immersion time. The results based on the microstructure and the corrosion morphology observation and analysis show that the quasi-continuous network of I-phase (Mg₃YZn₆) at grain boundaries has a dual effect on the corrosion behavior of the alloy. As a cathode to accelerate corrosion or a barrier can restrain the further expansion of corrosion. The corrosion process can be divided into three stages, corresponding to corrosion features with different times. At the initial stage, the solute depleted zones formed corrosion grooves about several microns in width; at the middle stage, the regions with high concentration of Zr formed many corrosion pits in the α-Mg matrix; at the final stage, the corrosion grooves and corrosion pits extended toward the α-Mg matrix.

Key words： biodegradable magnesium alloy simulated body fluid I-phase corrosion behavior

Published: 25 December 2017 Online: 2018-05-08

CLC number:

TG146.22

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	Articles by authors
	SUN Yi
	ZHANG Wenxin
	XU Chunxiang
	ZHANG Jinshan
	HAN Shaobing
	JIA Changjian

Cite this article:

SUN Yi,ZHANG Wenxin,XU Chunxiang, et al. Corrosion Behavior of As-cast Mg-Zn-Y-Zr-Ca Alloy in Simulated Body Fluid[J]. Materials Reports, 2017, 31(24): 105-108.

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https://www.mater-rep.com/EN/10.11896/j.issn.1005-023X.2017.024.021 OR https://www.mater-rep.com/EN/Y2017/V31/I24/105

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