Potentiostatic deposition process of fluoride conversion film on AZ31 magnesium alloy in 0.1 M KF solution

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	Potentiostatic deposition process of fluoride conversion film on AZ31 magnesium alloy in 0.1 M KF solution
	L. P. Wu; J. H. Dong; W. Ke
	2013
发表期刊	Electrochimica Acta
ISSN	0013-4686
卷号	105 页码:554-559
摘要	The coating process of fluoride conversion film deposited at -1.4 V on AZ31 Mg alloy in 0.1 M KF solution of pH 7.5 at room temperature was studied by in situ potentiostatic polarization, together with scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD) and Xray photoelectron spectroscopy (XPS). Our results show that the coating process can be distinguished into five stages. The initial two stages are caused by the rapid discharge of the electrical double layer capacitance and the slow increase of the faradaic current density on AZ31 Mg alloy and Mg(OH)(2) was detected in the corrosion product at these stages. The third process corresponds to the deposition of amorphous MgF2 film followed by the failure of the protection of MgF2 caused by Mg(OH)(2) at the fourth process. Finally, the deposition of crystallized KMgF3 occurs. The SEM and XPS depth profile indicate that the deposited coating consists of two layers. The inner layer is composed of amorphous Mg(OH)(2) and MgF2 with a thickness of about 300 nm, and the outer one is comprised of Mg(OH)(2), MgF2 and KMgF3 with thickness of about 260 nm. (c) 2013 Elsevier Ltd. All rights reserved.
部门归属	[wu, liping ; dong, junhua ; ke, wei] chinese acad sci, inst met res, state key lab corros & protect, shenyang 110016, peoples r china. ; dong, jh (reprint author), chinese acad sci, inst met res, state key lab corros & protect, shenyang 110016, peoples r china. ; jhdong@imr.ac.cn
关键词	Az31 Magnesium Alloy Fluoride Conversion Film Potentiostatic Technique Coating Process` Corrosion Behavior Degradation Behavior Electrodeposition Hydroxyapatite Coatings Nucleation Implants Environment
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语种	英语
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/71586
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	L. P. Wu,J. H. Dong,W. Ke. Potentiostatic deposition process of fluoride conversion film on AZ31 magnesium alloy in 0.1 M KF solution[J]. Electrochimica Acta,2013,105:554-559.
APA	L. P. Wu,J. H. Dong,&W. Ke.(2013).Potentiostatic deposition process of fluoride conversion film on AZ31 magnesium alloy in 0.1 M KF solution.Electrochimica Acta,105,554-559.
MLA	L. P. Wu,et al."Potentiostatic deposition process of fluoride conversion film on AZ31 magnesium alloy in 0.1 M KF solution".Electrochimica Acta 105(2013):554-559.