Water uptake and failure of epoxy coatings on LY12 aluminum alloy in NaCl solution

IMR OpenIR

	Water uptake and failure of epoxy coatings on LY12 aluminum alloy in NaCl solution
	Hu, JM ; Zhang, JQ ; Zhang, JT ; Cao, CN
通讯作者	Hu, JM()
	2003-09-01
发表期刊	ACTA METALLURGICA SINICA
ISSN	0412-1961
卷号	39 期号:9 页码:955-961
摘要	Impedance parameters of LY12 Al alloy epoxy electrodes immersed in NaCl solution for different times were calculated by using proper equivalent circuit (EC). A two-stage sorption for water in epoxy coatings was detected from the time dependence of coating capacitance, CC. The apparent diffusion coefficient of water was obtained from the linear part of InCc-t(0.5) curve at the early immersion stage. The diffusion coefficient of Cl-, calculated from the occurrence time of impedance components of Cl- participating salt film in EIS, is 4.67x10(-12) cm(2) . s(-1). Due to the water uptake the increase of coating capacitance and the decrease of the coating resistance mainly take place in the early immersion time, whilst the open-circuit potentials, E-oc, changes throughout the whole immersion time. The variation of E-oc display four stages: a sharp increase in the early time, a slow increase in the second stage, then dramatic increase again in the intermediate stage and a decrease in the final stage with an activation of alloy base and a failure of coatings. The experimental results show a close relationship between the behavior of Cl- containing salt film (the formation, growth and dissolution etc.) and the change of E-oc, indicating a major role of the salt film on the degradation of LY12 Al alloy/epoxy system.
关键词	LY12 aluminum alloy Epoxy coating water uptake failure
收录类别	SCI
语种	英语
WOS研究方向	Metallurgy & Metallurgical Engineering
WOS类目	Metallurgy & Metallurgical Engineering
WOS记录号	WOS:000186144000012
出版者	SCIENCE CHINA PRESS
引用统计	被引频次：5[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/321006/116139
专题	中国科学院金属研究所
通讯作者	Hu, JM
作者单位	1.Zhejiang Univ, Dept Chem, Hangzhou 310027, Peoples R China 2.Chinese Acad Sci, Met Res Inst, State Key Lab Corros & Protect, Shenyang 110016, Peoples R China
推荐引用方式 GB/T 7714	Hu, JM,Zhang, JQ,Zhang, JT,et al. Water uptake and failure of epoxy coatings on LY12 aluminum alloy in NaCl solution[J]. ACTA METALLURGICA SINICA,2003,39(9):955-961.
APA	Hu, JM,Zhang, JQ,Zhang, JT,&Cao, CN.(2003).Water uptake and failure of epoxy coatings on LY12 aluminum alloy in NaCl solution.ACTA METALLURGICA SINICA,39(9),955-961.
MLA	Hu, JM,et al."Water uptake and failure of epoxy coatings on LY12 aluminum alloy in NaCl solution".ACTA METALLURGICA SINICA 39.9(2003):955-961.