Corrosion behavior of rare earth metal (REM) conversion coatings on aluminum alloy LY12

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	Corrosion behavior of rare earth metal (REM) conversion coatings on aluminum alloy LY12
	X. W. Yu ; C. N. Cao ; Z. M. Yao ; D. R. Zhou ; Z. D. Yin
刊名	Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing
	2000
卷号	284 期号:1-2 页码:56-63
关键词	LY12 alloy REM conversion coatings corrosion behavior electrochemical impedance spectroscopy (EIS) equivalent circuit film-forming inhibitors surface modification stainless aluminum protection
ISSN号	0921-5093
中文摘要	The processes of the double layer rare earth metal (REM) conversion coating on aluminum alloy LY12 (2024) were introduced. The results of polarization tests showed that the corrosion resistance of the double layer REM conversion coating was superior to that of chromate conversion coating. The corrosion behavior of REM conversion coatings on LY12 alloy was studied with optical microscopy and energy dispersive spectroscopy (EDS). The results showed that in NaCl solution, pits initiated on the coatings formed on Cu-rich intermetalics. According to the equivalent circuit of pitting, a new method for analyzing the pit growth of REM conversion coatings was put forward by employing electrochemical impedance spectroscopy (EIS). Transmission line W in equivalent circuit could be neglected in short term exposure of REM conversion coatings to NaCl solution. This led to a formula for calculating the area fraction of pitting (F) on the surface of REM conversion coatings by simplifying the equivalent circuit. (C) 2000 Elsevier Science S.A. All rights reserved.
原文出处	://WOS:000086906500007
公开日期	2012-04-14
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/37236]
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	X. W. Yu,C. N. Cao,Z. M. Yao,et al. Corrosion behavior of rare earth metal (REM) conversion coatings on aluminum alloy LY12[J]. Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing,2000,284(1-2):56-63.
APA	X. W. Yu,C. N. Cao,Z. M. Yao,D. R. Zhou,&Z. D. Yin.(2000).Corrosion behavior of rare earth metal (REM) conversion coatings on aluminum alloy LY12.Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing,284(1-2),56-63.
MLA	X. W. Yu,et al."Corrosion behavior of rare earth metal (REM) conversion coatings on aluminum alloy LY12".Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing 284.1-2(2000):56-63.