Corrosion behaviour of AZ21, AZ501 and AZ91 in sodium chloride

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	Corrosion behaviour of AZ21, AZ501 and AZ91 in sodium chloride
	G. L. Song; A. Atrens; X. L. Wu; B. Zhang
	1998
发表期刊	Corrosion Science
ISSN	0010-938X
卷号	40 期号:10 页码:1769-1791
摘要	The corrosion behaviour of AZ21, AZ501 and AZ91 was studied in 1 N NaCl at pH 11 by measuring electrochemical polarization curves, electrochemical AC impedance spectroscopy (EIS) and simultaneously measuring the hydrogen evolution rate and the: magnesium dissolution rate. The corrosion rates increased in the following order: AZ501 < AZ21 < AZ91. The: corrosion behaviour was related to alloy microstructure as revealed by optical and electron microscopy. The beta phase was very stable in the test solution and was an effective cathode. The beta phase served two roles, as a barrier and as a galvanic cathode. If the beta phase is present in the alpha matrix as intergranular precipitates with a small volume fraction, then the beta phase mainly serves as a galvanic cathode, and accelerates the corrosion of the alpha matrix. If the beta Fraction is high, then the beta phase may mainly act as an anodic barrier to inhibit the overall corrosion of the alloy. The composition and compositional distribution in the alpha phase is also crucial to the overall corrosion performance of dual phase alloys. Increasing the aluminum concentration in the alpha phase increases the anodic dissolution rate and also increases the cathodic hydrogen evolution rate. Increasing the zinc concentration in the alpha phase may have the opposite effect. (C) 1998 Elsevier Science Ltd. All rights reserved.
部门归属	univ queensland, dept min minerals & mat engn, cast, brisbane, qld 4072, australia. acad sinica, inst corros & protect met, state key lab corros & protect, shenyang 110015, peoples r china.;song, gl (reprint author), univ queensland, dept min minerals & mat engn, cast, brisbane, qld 4072, australia
关键词	Magnesium Alloys Corrosion Negative Difference Effect Microstructure Magnesium Alloys Electrode
URL	查看原文
WOS记录号	WOS:000077604500011
引用统计	被引频次：774[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/37773
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	G. L. Song,A. Atrens,X. L. Wu,et al. Corrosion behaviour of AZ21, AZ501 and AZ91 in sodium chloride[J]. Corrosion Science,1998,40(10):1769-1791.
APA	G. L. Song,A. Atrens,X. L. Wu,&B. Zhang.(1998).Corrosion behaviour of AZ21, AZ501 and AZ91 in sodium chloride.Corrosion Science,40(10),1769-1791.
MLA	G. L. Song,et al."Corrosion behaviour of AZ21, AZ501 and AZ91 in sodium chloride".Corrosion Science 40.10(1998):1769-1791.