Effect of variations of Al content on microstructure and corrosion resistance of PEO coatings on Mg-Al alloys

IMR OpenIR

	Effect of variations of Al content on microstructure and corrosion resistance of PEO coatings on Mg-Al alloys
	Wei, Fangfang; Zhang, Wei; Zhang, Tao; Wang, Fuhui; Zhang, W; Zhang, T (reprint author), Chinese Acad Sci, Inst Met Res, Lab Corros & Protect, 62 Wencui Rd, Shenyang 110016, Peoples R China.
	2017-01-05
发表期刊	JOURNAL OF ALLOYS AND COMPOUNDS
ISSN	0925-8388
卷号	690 页码:195-205
摘要	The corrosion behavior of PEO coatings of four Mg-Al alloys was investigated with the emphasis on the effect of Al contents in the substrates. Results indicate that the volume fraction of beta phase (Mg17Al12) and interfaces of beta/eutectic phase (alpha+beta) increased with the increasing Al content, which have strong influences on the microstructure, the components and the porosity level of PEO coatings. PEO coatings were composed of two layers: an inner layer (IL) and an outer layer (OL). The differences in components of the IL can be ascribed to the enrichment of Al in beta phase and eutectic phase (alpha+beta) compared to alpha phase, which facilitate to form MgAl2O4. The increased defects of the IL caused by the increasing interfaces could be related to the high misfit degree and difference of Fermi energy (E-f) of components of IL. The porosity level of the PEO coatings first decreases and then increases with the increasing Al content caused by different discharging behaviors. It is found that the corrosion resistance first increases and later decreases, and resulted from microstructures of PEO coatings on different Mg-Al alloys. (C) 2016 Elsevier B.V. All rights reserved.; The corrosion behavior of PEO coatings of four Mg-Al alloys was investigated with the emphasis on the effect of Al contents in the substrates. Results indicate that the volume fraction of beta phase (Mg17Al12) and interfaces of beta/eutectic phase (alpha+beta) increased with the increasing Al content, which have strong influences on the microstructure, the components and the porosity level of PEO coatings. PEO coatings were composed of two layers: an inner layer (IL) and an outer layer (OL). The differences in components of the IL can be ascribed to the enrichment of Al in beta phase and eutectic phase (alpha+beta) compared to alpha phase, which facilitate to form MgAl2O4. The increased defects of the IL caused by the increasing interfaces could be related to the high misfit degree and difference of Fermi energy (E-f) of components of IL. The porosity level of the PEO coatings first decreases and then increases with the increasing Al content caused by different discharging behaviors. It is found that the corrosion resistance first increases and later decreases, and resulted from microstructures of PEO coatings on different Mg-Al alloys. (C) 2016 Elsevier B.V. All rights reserved.
部门归属	[wei, fangfang] univ sci & technol china, sch mat sci & engn, hefei 230026, peoples r china ; [wei, fangfang ; zhang, wei ; zhang, tao ; wang, fuhui] chinese acad sci, inst met res, lab corros & protect, 62 wencui rd, shenyang 110016, peoples r china
关键词	Magnesium Alloys Tem Plasma Electrolytic Oxidation Oxide Coatings
学科领域	Chemistry, Physical ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
资助者	Hundred Talents Program of Chinese Academy of Sciences; National Natural Science Foundation of China [5153000271, 51001107]
收录类别	SCI
语种	英语
WOS记录号	WOS:000385901300028
引用统计	被引频次：46[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/321006/78351
专题	中国科学院金属研究所
通讯作者	Zhang, W; Zhang, T (reprint author), Chinese Acad Sci, Inst Met Res, Lab Corros & Protect, 62 Wencui Rd, Shenyang 110016, Peoples R China.
推荐引用方式 GB/T 7714	Wei, Fangfang,Zhang, Wei,Zhang, Tao,et al. Effect of variations of Al content on microstructure and corrosion resistance of PEO coatings on Mg-Al alloys[J]. JOURNAL OF ALLOYS AND COMPOUNDS,2017,690:195-205.
APA	Wei, Fangfang,Zhang, Wei,Zhang, Tao,Wang, Fuhui,Zhang, W,&Zhang, T .(2017).Effect of variations of Al content on microstructure and corrosion resistance of PEO coatings on Mg-Al alloys.JOURNAL OF ALLOYS AND COMPOUNDS,690,195-205.
MLA	Wei, Fangfang,et al."Effect of variations of Al content on microstructure and corrosion resistance of PEO coatings on Mg-Al alloys".JOURNAL OF ALLOYS AND COMPOUNDS 690(2017):195-205.