Effect of Ga Content on Microstructure and Degradability of Al-Mg-Ga-Sn Alloys

	Effect of Ga Content on Microstructure and Degradability of Al-Mg-Ga-Sn Alloys
	Zhang Jianbin; Liu Junjun; Li Qinglin
刊名	RARE METAL MATERIALS AND ENGINEERING
	2019-12
卷号	48 期号:12 页码:4039-4045
关键词	aluminum alloy degradable microstructure corroded morphology
ISSN号	1002-185X
英文摘要	Al-Mg-Ga-Sn alloys with different Ga contents were prepared by electric furnace melting. The microstructure morphology and composition were characterized by optical microscopy (OM), scanning electron microscopy (SEM) and X-ray diffractometry (XRD); the degradation rates were measured in pure water at 30, 40, 70 and 90 degrees C; and the electrochemical performance at room temperature was tested using the electrochemical workstation. The results reveal that in case that Mg+Sn is 10% (mass fraction), Al-Mg-Ga-Sn alloys with 0 wt%, 4 wt%, 8 wt%, 12 wt% and 16 wt% Ga, all contain Al matrix phase and Mg2Sn phase. Moreover, Ga5Mg2 phase appears with the increase in Ga content. The degradability of Al-Mg-Ga-Sn alloys primarily presents start-up with pitting corrosion in aluminum matrix phase, and acceleration with intergranular corrosion between Mg2Sn and Ga5Mg2 compound phases. The initial degradation temperatures of alloys with different Ga contents depend on the content of low melting point elements (Ga+Sn) solved in the aluminum matrix; the alloy with the same Ga content rapidly degrades with elevating temperature, and the degradation reaction kinetics follows Arrhenius equation. Electrochemical analysis at room temperature indicates that as Ga content increases in Al-Mg-Ga-Sn alloy, the corresponding corrosion potential negatively shifts to different extents, while the corrosion current gradually improves.
WOS研究方向	Materials Science ; Metallurgy & Metallurgical Engineering
语种	中文
出版者	NORTHWEST INST NONFERROUS METAL RESEARCH
WOS记录号	WOS:000504920800037
状态	已发表
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/64300]
专题	材料科学与工程学院省部共建有色金属先进加工与再利用国家重点实验室
通讯作者	Zhang Jianbin
作者单位	Lanzhou Univ Technol, State Key Lab Adv Proc & Recycling Nonferrous Met, Lanzhou 730050, Gansu, Peoples R China
推荐引用方式 GB/T 7714	Zhang Jianbin,Liu Junjun,Li Qinglin. Effect of Ga Content on Microstructure and Degradability of Al-Mg-Ga-Sn Alloys[J]. RARE METAL MATERIALS AND ENGINEERING,2019,48(12):4039-4045.
APA	Zhang Jianbin,Liu Junjun,&Li Qinglin.(2019).Effect of Ga Content on Microstructure and Degradability of Al-Mg-Ga-Sn Alloys.RARE METAL MATERIALS AND ENGINEERING,48(12),4039-4045.
MLA	Zhang Jianbin,et al."Effect of Ga Content on Microstructure and Degradability of Al-Mg-Ga-Sn Alloys".RARE METAL MATERIALS AND ENGINEERING 48.12(2019):4039-4045.