锌含量对铝基可降解合金降解速率的影响

doi:10.11896/j.issn.1005-023X.2018.06.017

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Abstract The degradable aluminum alloys of different Zn content were prepared by melting technique based on the Al-Mg-Ga-In-Sn alloy. The effect of different Zn content on phase compositions, microstructure and electrochemical parameters of the degradable aluminum alloys were analyzed by X-ray diffraction (XRD), scanning electron microscope (SEM) and electrochemical workstation. In addition, the degradation rates were conducted in distilled water at 90 ℃. Experimental results showed that the composition, amount and morphology of the precipitates in alloys played an important role in changing the degradation rates. As the increa-sing Zn content, the main precipitation was changed to the dendritic or the network Mg₃₂(AlZn)₄₉ from the clavate Mg₂Sn. The degradation of alloys always started along the globular phase which was rich in Mg-In, and spread around it. Obviously, a large amount of Mg was combined into the Mg₃₂(AlZn)₄₉ precipitation, which made both the corrosion proportion and the degradation rate decrease. Therefore, the Mg₃₂(AlZn)₄₉ can delay the degradation of alloys. Moreover, the E_corrof alloys was shifted to positive values in varying degrees and the i_corr decreased gradually. For this reason, the corrosion trend of alloys weakened and the degradation rate decreased in the end.

Key words： Zn content phase compositions microstructure polarization curves degradation rates

Published: 25 March 2018

CLC number:

TU512.4

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	Articles by authors
	GUO Siwen
	SHAO Yuan
	GU Zhengfu
	REN Guofu
	ZHANG Huaguang

Cite this article:

GUO Siwen,SHAO Yuan,GU Zhengfu, et al. Influence of Zn Content on the Degradation Rates of Degradable Aluminum Alloys[J]. Materials Reports, 2018, 32(6): 947-950.

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http://www.mater-rep.com/EN/10.11896/j.issn.1005-023X.2018.06.017 OR http://www.mater-rep.com/EN/Y2018/V32/I6/947

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