Preparation and Corrosion Performance of PEO Coating With Low Porosity on Magnesium Alloy AZ91D In Acidic KF System

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	Preparation and Corrosion Performance of PEO Coating With Low Porosity on Magnesium Alloy AZ91D In Acidic KF System; Preparation and Corrosion Performance of PEO Coating With Low Porosity on Magnesium Alloy AZ91D In Acidic KF System
	W. Zhang; B. Tian; K. Q. Du; H. X. Zhang; F. H. Wang
	2011 ; 2011
发表期刊	International Journal of Electrochemical Science ; International Journal of Electrochemical Science
ISSN	1452-3981 ; 1452-3981
卷号	6 期号:11 页码:5228-5248
摘要	A plasma electrolytic oxidation (PEO) ceramic coating F-B-A with excellent compactness was prepared on magnesium alloy AZ91D in acidic KF solution with dihydric phosphate by applying a bipolar pulse voltage. For comparison, two other coatings F-M and F-M-A were prepared in the same solution with and without addition of dihydric phosphate by applying a mono-polar pulse voltage. The composition and microstructure of the coatings were characterized by XRD, XPS and SEM. While their corrosion performance in 3.5% NaCl solution was examined by potentiodynamic polarization and electrochemical impedance spectroscopy (EIS). Results showed that the F-B-A coating was uniform and compact without fissures on surface, and its porosity was around 4.8%; while the other coatings were loose and porous with porosity around 45.6% and 27.9%, respectively. The F-B-A coating showed a bi-layered microstructure, of which the outer consisted mainly of KMgF(3) and MgF(2) with seldom MgO, whereas, the inner mainly of MgF(2), Mg(3) (PO4)(2), MgHPO(4) and little MgO. The magnesium alloy with F-B-A coating exhibited corrosion resistance about three orders higher than the sample with the F-M coating. EIS tests indicated that this bi-layered coating slowed down the penetration rate of chlorine ions and postponed the initiation of pitting corrosion on substrate.; A plasma electrolytic oxidation (PEO) ceramic coating F-B-A with excellent compactness was prepared on magnesium alloy AZ91D in acidic KF solution with dihydric phosphate by applying a bipolar pulse voltage. For comparison, two other coatings F-M and F-M-A were prepared in the same solution with and without addition of dihydric phosphate by applying a mono-polar pulse voltage. The composition and microstructure of the coatings were characterized by XRD, XPS and SEM. While their corrosion performance in 3.5% NaCl solution was examined by potentiodynamic polarization and electrochemical impedance spectroscopy (EIS). Results showed that the F-B-A coating was uniform and compact without fissures on surface, and its porosity was around 4.8%; while the other coatings were loose and porous with porosity around 45.6% and 27.9%, respectively. The F-B-A coating showed a bi-layered microstructure, of which the outer consisted mainly of KMgF(3) and MgF(2) with seldom MgO, whereas, the inner mainly of MgF(2), Mg(3) (PO4)(2), MgHPO(4) and little MgO. The magnesium alloy with F-B-A coating exhibited corrosion resistance about three orders higher than the sample with the F-M coating. EIS tests indicated that this bi-layered coating slowed down the penetration rate of chlorine ions and postponed the initiation of pitting corrosion on substrate.
部门归属	[zhang, wei; du, ke-qin; wang, fu-hui] chinese acad sci, inst met res, state key lab corros & protect, shenyang 110016, peoples r china. [tian, bo] shenyang univ technol, sch sci, shenyang 110178, peoples r china. [zhang, hui-xia] luoyang ship mat res inst, sci & technol marine corros & protect lab, qingdao 266101, peoples r china.;zhang, w (reprint author), chinese acad sci, inst met res, state key lab corros & protect, 62 wencui rd, shenyang 110016, peoples r china;weizhang@imr.ac.cn ; [zhang, wei; du, ke-qin; wang, fu-hui] chinese acad sci, inst met res, state key lab corros & protect, shenyang 110016, peoples r china. [tian, bo] shenyang univ technol, sch sci, shenyang 110178, peoples r china. [zhang, hui-xia] luoyang ship mat res inst, sci & technol marine corros & protect lab, qingdao 266101, peoples r china.;zhang, w (reprint author), chinese acad sci, inst met res, state key lab corros & protect, 62 wencui rd, shenyang 110016, peoples r china;weizhang@imr.ac.cn
关键词	Peo Coating Peo Coating Magnesium Alloy Magnesium Alloy Kf Based Electrolyte Kf Based Electrolyte Bipolar Mode Bipolar Mode Corrosion Behavior Corrosion Behavior Plasma Electrolytic Oxidation Plasma Electrolytic Oxidation Electrochemical Impedance Spectroscopy Electrochemical Impedance Spectroscopy Silicate-containing Electrolytes Silicate-containing Electrolytes Microarc Oxidation Microarc Oxidation Nacl Solution Nacl Solution Mg Mg Alloy Alloy Resistance Resistance Films Films Behavior Behavior Aluminum Aluminum
URL	查看原文 ; 查看原文
WOS记录号	WOS:000297503300011 ; WOS:000297503300011
引用统计	被引频次：43[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/321006/30918
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	W. Zhang,B. Tian,K. Q. Du,et al. Preparation and Corrosion Performance of PEO Coating With Low Porosity on Magnesium Alloy AZ91D In Acidic KF System, Preparation and Corrosion Performance of PEO Coating With Low Porosity on Magnesium Alloy AZ91D In Acidic KF System[J]. International Journal of Electrochemical Science, International Journal of Electrochemical Science,2011, 2011,6, 6(11):5228-5248, 5228-5248.
APA	W. Zhang,B. Tian,K. Q. Du,H. X. Zhang,&F. H. Wang.(2011).Preparation and Corrosion Performance of PEO Coating With Low Porosity on Magnesium Alloy AZ91D In Acidic KF System.International Journal of Electrochemical Science,6(11),5228-5248.
MLA	W. Zhang,et al."Preparation and Corrosion Performance of PEO Coating With Low Porosity on Magnesium Alloy AZ91D In Acidic KF System".International Journal of Electrochemical Science 6.11(2011):5228-5248.