Impedance models of epoxy coated LY12 aluminum alloys in NaCl solution

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	Impedance models of epoxy coated LY12 aluminum alloys in NaCl solution
	J. M. Hu; J. Q. Zhang; D. M. Xie; C. N. Cao
	2003
发表期刊	Acta Physico-Chimica Sinica
ISSN	1000-6818
卷号	19 期号:2 页码:144-149
摘要	Electrochemical impedance spectroscopy (EIS) of bare LY12 Al alloy and LY12/epoxy electrodes in 3.5% (mass fraction) NaCl solution has been investigated, respectively. The results show that the impedance spectra for bare LY12 alloys below the pitting potential ( E-pp) consist of two capacitance loops, relating to the formation of Cl- containing salt film at high frequencies and anodically electrochemical dissolution of Al at low frequencies. An inductive loop was detected at low frequencies with potentials above the E-pp. Water tends to uptake in epoxy coating preferentially in the early time. After water and oxygen reach the alloy base the electrochemical reaction interface will form on the base, and the alloy is corroded. Then the diffusion of the corrosion products becomes the rate determining step in the case of coating barrier. When the slow diffusion particle Cl- accesses to coating/alloy interface, Cl- interacts with the stimulating corrosion products and a chemical reaction salt film is formed, resulting in the presence of film impedance and the disappear of diffusion impedance in EIS. According to the above experimental phenomena different impedance models in various immersion stages are proposed to fit the EIS measurements.
部门归属	zhejiang univ, dept chem, hangzhou 310027, peoples r china. chinese acad sci, inst met res, state key lab corros & protect, shenyang 110016, peoples r china.;zhang, jq (reprint author), zhejiang univ, dept chem, hangzhou 310027, peoples r china
关键词	Ly12 Aluminum Alloy Epoxy Coating Electrochemical Impedance Spectroscopy Equivalent Electrical Circuit Pure Aluminum Localized Corrosion Anodic-dissolution Steel Behavior Coatings Films Media
URL	查看原文
WOS记录号	WOS:000181098000011
引用统计	被引频次：20[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/321006/35852
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	J. M. Hu,J. Q. Zhang,D. M. Xie,et al. Impedance models of epoxy coated LY12 aluminum alloys in NaCl solution[J]. Acta Physico-Chimica Sinica,2003,19(2):144-149.
APA	J. M. Hu,J. Q. Zhang,D. M. Xie,&C. N. Cao.(2003).Impedance models of epoxy coated LY12 aluminum alloys in NaCl solution.Acta Physico-Chimica Sinica,19(2),144-149.
MLA	J. M. Hu,et al."Impedance models of epoxy coated LY12 aluminum alloys in NaCl solution".Acta Physico-Chimica Sinica 19.2(2003):144-149.