Microstructure and corrosion behavior of coated AZ91 alloy by microarc oxidation for biomedical application

IMR OpenIR

	Microstructure and corrosion behavior of coated AZ91 alloy by microarc oxidation for biomedical application
	Y. M. Wang; F. H. Wang; M. J. Xu; B. Zhao; L. X. Guo; J. H. Ouyang
	2009
发表期刊	Applied Surface Science
ISSN	0169-4332
卷号	255 期号:22 页码:9124-9131
摘要	Magnesium and its alloy currently are considered as the potential biodegradable implant materials, while the accelerated corrosion rate in intro environment leads to implant failure by losing the mechanical integrity before complete restoration. Dense oxide coatings formed in alkaline silicate electrolyte with and without titania sol addition were fabricated on magnesium alloy using microarc oxidation process. The microstructure, composition and degradation behavior in simulated body fluid (SBF) of the coated specimens were evaluated. It reveals that a small amount of TiO(2) is introduced into the as-deposited coating mainly composed of MgO and Mg(2)SiO(4) by the addition of titania sol into based alkaline silicate electrolytic bath. With increasing concentration of titania sol from 0 to 10 vol.%, the coating thickness decreases from 22 to 18 mm. Electrochemical tests show that the E(corr) of Mg substrate positively shifted about 300 similar to 500 mV and i(corr) lowers more than 100 times after microarc oxidation. However, the TiO(2) modified coatings formed in electrolyte containing 5 and 10 vol.% titania sol indicate an increasing worse corrosion resistance compared with that of the unmodified coating, which is possibly attributed to the increasing amorphous components caused by TiO(2) involvement. The long term immersing test in SBF is consistent with the electrochemical test, with the coated Mg alloy obviously slowing down the biodegradation rate, meanwhile accompanied by the increasing damage trends in the coatings modified by 5 and 10 vol.% titania sol. (C) 2009 Elsevier B. V. All rights reserved.
部门归属	[wang, y. m.; xu, m. j.; zhao, b.; guo, l. x.; ouyang, j. h.] harbin inst technol, inst adv ceram, harbin 150001, peoples r china. [wang, y. m.; wang, f. h.] harbin univ engn, coll mat sci & chem engn, harbin 150001, peoples r china. [wang, f. h.] chinese acad sci, inst met res, state key lab corros & protect, shenyang 110016, peoples r china.;wang, ym (reprint author), harbin inst technol, inst adv ceram, harbin 150001, peoples r china;wangyaming@hit.edu.cn
关键词	Magnesium Alloy Microarc Oxidation Coating Biodegradable Property Simulated Body-fluid In-vivo Corrosion Magnesium Alloys Hanks Solution Vapor-deposition Wear-resistance Pure Magnesium Oxide-films Surface Bone
URL	查看原文
WOS记录号	WOS:000269075700028
引用统计	被引频次：125[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/321006/32405
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	Y. M. Wang,F. H. Wang,M. J. Xu,et al. Microstructure and corrosion behavior of coated AZ91 alloy by microarc oxidation for biomedical application[J]. Applied Surface Science,2009,255(22):9124-9131.
APA	Y. M. Wang,F. H. Wang,M. J. Xu,B. Zhao,L. X. Guo,&J. H. Ouyang.(2009).Microstructure and corrosion behavior of coated AZ91 alloy by microarc oxidation for biomedical application.Applied Surface Science,255(22),9124-9131.
MLA	Y. M. Wang,et al."Microstructure and corrosion behavior of coated AZ91 alloy by microarc oxidation for biomedical application".Applied Surface Science 255.22(2009):9124-9131.