A study of the corrosion of aluminum alloy 2024-T3 under thin electrolyte layers

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	A study of the corrosion of aluminum alloy 2024-T3 under thin electrolyte layers
	Y. L. Cheng; Z. Zhang; F. H. Cao; J. F. Li; J. Q. Zhang; J. M. Wang; C. N. Cao
	2004
发表期刊	Corrosion Science
ISSN	0010-938X
卷号	46 期号:7 页码:1649-1667
摘要	The corrosion of aluminum alloy 2024-T3 (AA2024-T3) under thin electrolyte layers was studied in 3.0 wt% sodium chloride solutions by cathodic polarization and electrochemical impedance spectroscopy (EIS) method. The cathodic polarization measurements show that, when the electrolyte layer is thicker than 200 mum, the oxygen reduction current is close to that of the bulk solution. But in the range of 200-100 mum, the oxygen reduction current is inversely proportional to the layer thickness, which shows that the oxygen diffusion through the electrolyte layer is the rate-determining step for the oxygen reduction process. In the range of 100 mum to about 58 mum, the oxygen reduction current is slightly decreased probably due to the formation of aluminum hydroxide or the change of the diffusion pattern from 2-dimensional diffusion to one-dimensional diffusion. The further decrease in electrolyte layer thickness increase the oxygen reduction current to some extent again, because the diffusion of oxygen plays more important role in thin electrolyte layers. The EIS measurements show that the corrosion is controlled by the cathodic oxygen reduction at the initial stage, showing the largest corrosion rate at the electrolyte layer thickness of 105 mum. But at the later stage of corrosion, the anodic process begin to affect the corrosion rates and the corrosion rates show a maximum at 170 mum, which may be the thickness where the corrosion changes from cathodic control to anodic control. The corrosion rate under the very thin electrolyte layer (62 mum in this study) is even smaller than that in bulk solution, this is due to that the anodic process is strongly inhibited. (C) 2003 Elsevier Ltd. All rights reserved.
部门归属	zhejiang univ, dept chem, hangzhou 310027, peoples r china. hunan univ, dept mat, changsha 410012, peoples r china. state key lab corros & protect, shenyang 110015, peoples r china.;zhang, z (reprint author), zhejiang univ, dept chem, hangzhou 310027, peoples r china;eaglezzy@zjuem.zju.edu.cn
关键词	Thin Electrolyte Layers Atmospheric Corrosion Aa2024 Cathodic Polarization Eis Atmospheric Corrosion Electrochemical Impedance Pitting Corrosion Ac-impedance Steel Metals
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WOS记录号	WOS:000222402500005
引用统计	被引频次：193[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/321006/35333
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	Y. L. Cheng,Z. Zhang,F. H. Cao,et al. A study of the corrosion of aluminum alloy 2024-T3 under thin electrolyte layers[J]. Corrosion Science,2004,46(7):1649-1667.
APA	Y. L. Cheng.,Z. Zhang.,F. H. Cao.,J. F. Li.,J. Q. Zhang.,...&C. N. Cao.(2004).A study of the corrosion of aluminum alloy 2024-T3 under thin electrolyte layers.Corrosion Science,46(7),1649-1667.
MLA	Y. L. Cheng,et al."A study of the corrosion of aluminum alloy 2024-T3 under thin electrolyte layers".Corrosion Science 46.7(2004):1649-1667.