Corrosion behavior of two heat treatment Al-Zn-Mg-Cu alloys in different intergranular corrosion solution

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	Corrosion behavior of two heat treatment Al-Zn-Mg-Cu alloys in different intergranular corrosion solution
	F. H. Cao ; Z. K. Zhang ; J. F. Li ; Y. L. Cheng ; J. Q. Zhang ; C. N. Cao
刊名	Transactions of Nonferrous Metals Society of China
	2004
卷号	14 期号:3 页码:619-625
关键词	intergranular corrosion(IGC) AI-Zn-Mg-Cu alloy electrochemical impedance spectroscopy electrochemical noise morphology exfoliation corrosion electrochemical impedance nacl li
ISSN号	1003-6326
中文摘要	The electrochemical behavior of two kinds of artificial aged Al-Zn-Mg-Cu alloys in two intergranular corrosion (IGC) solutions were studied using electrochemical impedance spectroscopy (EIS) and open circuit potential (OCP) at steady-state. EDAX result indicates that different artificial ageing methods change the composition and content of Cu and Zn in different zones. Zn/Cu depleted precipitation-free zone that plays a very important role in IGC is formed by heating the solubilized Al alloy for 135 degreesC at 16 h. All impedance spectra of the two alloys in two IGC solutions can be divided into three types. The two different states Al alloys takes on one time constant and two capacitive arcs at high-mediate frequency and low frequency in the NaCl+(NH4)(2)SO4 solution respectively; but in the NaCl+HCl solution, impedance displays one capacitive arc at the high-mediate frequency and an inductive loop at low frequency. OCP results show that more micro-galvanic cells in the NaCl+(NH4)(2)SO4 solution than that in the NaCl+HCl solution results in more potential fluctuation amplitude, and long-term drift of OCP is due to the long-term variation of the cathodic and anodic corrosion processes.
原文出处	://WOS:000222451000039
公开日期	2012-04-14
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/35311]
专题	金属研究所_中国科学院金属研究所
推荐引用方式 GB/T 7714	F. H. Cao,Z. K. Zhang,J. F. Li,et al. Corrosion behavior of two heat treatment Al-Zn-Mg-Cu alloys in different intergranular corrosion solution[J]. Transactions of Nonferrous Metals Society of China,2004,14(3):619-625.
APA	F. H. Cao,Z. K. Zhang,J. F. Li,Y. L. Cheng,J. Q. Zhang,&C. N. Cao.(2004).Corrosion behavior of two heat treatment Al-Zn-Mg-Cu alloys in different intergranular corrosion solution.Transactions of Nonferrous Metals Society of China,14(3),619-625.
MLA	F. H. Cao,et al."Corrosion behavior of two heat treatment Al-Zn-Mg-Cu alloys in different intergranular corrosion solution".Transactions of Nonferrous Metals Society of China 14.3(2004):619-625.